JP2010043677A - Transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission having improved lubricating performance even when external force acts to incline lubricating oil. <P>SOLUTION: This transmission has a shift mechanism including rotary members 6a and 6b, and a transmission case 1a for storing the shift mechanism and having a storage part T for storing the lubricating oil O, and lubricates the shift mechanism by using the lubricating oil O scraped up by a soaking part soaked in the lubricating oil O among the rotary member 6a, and is provided with a dynamic oil level holding member 8 projecting up to a position in close vicinity to an outer peripheral surface of the rotary member 6b from the inner wall side of the transmission case 1a. The dynamic oil level holding member 8 is arranged in a position where the volume of a space S surrounded by the dynamic oil level holding member 8, the outer periphery of the rotary member 6a and an oil level Oa of the lubricating oil, becomes 0 to the volume of the lubricating oil O. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission with improved lubrication performance.

Conventionally, as this type of transmission, as disclosed in Patent Document 1, a guide plate that is provided on both sides so as to sandwich a gear is proposed that protrudes from a case inner wall surface toward a gear tooth surface. .
In this transmission, the lubricating oil that is scraped up by the gears and splattered upwards can be efficiently guided to the gear side by the guide plate.
Japanese Patent Laid-Open No. 9-210186

  By the way, an external force that inclines the lubricating oil stored in the transmission case may act on the transmission mounted on the vehicle due to sudden start, sudden braking, sudden turning, or continuous uphill traveling of the vehicle. When this external force acts on the transmission, the above-described transmission has a problem in that the inclination of the lubricating oil cannot be suppressed and the lubricating oil cannot be scraped up by the gears.

The present invention aims to provide a transmission that can suppress the inclination of the lubricating oil and improve the lubrication performance, and has taken the following measures in order to achieve at least a part of this object.
The transmission of the present invention includes a transmission mechanism including a rotation member, and a transmission case that houses the transmission mechanism and has a storage portion that stores the lubricant, and is immersed in the lubricant among the rotation members. A transmission that lubricates at least a part of each part of the transmission mechanism directly or indirectly using the lubricating oil scooped up by a part, and close to the outer peripheral surface of the rotating member from the inner wall side of the transmission case A dynamic oil level holding member that protrudes to a position where the dynamic oil level holding member protrudes to the position where the dynamic oil level holding member, the rotating member, the oil level of the lubricating oil, and the inner surface of the transmission case are provided. The volume of the space surrounded by is arranged at a position where the volume of the space is 0 or more and less than or equal to the volume of the lubricating oil.

  According to the transmission of the present invention, the dynamic oil level holding member protruding from the inner wall side of the transmission case to a position close to the outer peripheral surface of the rotating member is provided, and the dynamic oil level holding member is Since the space enclosed by the surface holding member, the rotating member, the oil surface of the lubricating oil, and the inner surface of the transmission case is provided at a position where the volume is 0 or more and less than the volume of the lubricating oil, it is scraped up by the immersion part of the rotating member As a result, it is possible to suppress scattering of the lubricating oil and to effectively suppress the inclination of the lubricating oil even if an external force that inclines the lubricating oil acts on the transmission. In other words, since the inclination of the lubricating oil can be suppressed so that the immersion part of the rotating member is eliminated, a state in which the lubricating oil cannot be scooped up by the rotating member does not occur. As a result, the lubricating performance can be further improved.

In the transmission according to the present invention, the dynamic oil level holding member may be provided on both sides of the rotating member.
In this way, the inclination of the lubricating oil can be effectively suppressed.

Moreover, the transmission of this invention WHEREIN: The said dynamic oil level holding member shall be formed in the length covering the full length of the said transmission case.
If it carries out like this, scattering and inclination of lubricating oil can be suppressed over the full length of a transmission case. As a result, the lubricating performance can be further improved.

Further, in the transmission of the present invention, the dynamic oil level holding member has a shape capable of guiding at least a part of the lubricating oil scraped up by the immersion part of the rotating member to at least a part of each part of the transmission mechanism. It can also be formed.
By doing so, at least a part of the lubricating oil to be scraped can be guided to at least a part of each part of the speed change mechanism, so that the lubricating performance can be further improved.

In the transmission according to the aspect of the invention, at least a part of the dynamic oil level holding member may be formed in a shape along the circumferential direction with respect to the outer peripheral surface of the rotating member.
If it carries out like this, the lubricating oil scraped up can be guide | induced along the outer peripheral surface of a rotating member.

The transmission of the present invention further includes a lubricating oil return portion capable of returning the lubricating oil scattered in the upper space opposite to the space across the dynamic oil level holding member to the storage portion. It can also be.
If it carries out like this, the lubricating oil which scattered in the upper space among the lubricating oil scraped up by the immersion part of a rotating member can be returned to a storage part again.

Moreover, the transmission of this invention WHEREIN: The said lubricating oil return part can also be made into the through-hole which penetrates the said dynamic oil level holding member from the said upper space side to the said space side.
If it carries out like this, the structure which returns the lubricating oil which scattered in upper space among the lubricating oil scraped up by the immersion part of the rotating member to a storage part is simply securable.

In the transmission according to the present invention, the through hole may be formed at a position shifted from the immersion part in the axial direction of the rotating member.
If it carries out like this, the lubricating oil scattered by the upper space can be returned to a storage part, suppressing that the lubricating oil scraped up by the immersion part of a rotating member splashes into an upper space from a through-hole.

Further, in the transmission according to the present invention, the dynamic oil level holding member may be formed such that a surface on the upper space side is formed in a bowl shape.
If it carries out like this, it can suppress that the lubricating oil which falls to the surface at the side of the upper space of a dynamic oil level holding member is scraped up by a rotating member again. As a result, the lubricating oil can be quickly returned to the reservoir.

Next, the best mode for carrying out the present invention will be described using examples.
As shown in the figure, the transmission 1 of the embodiment includes an input shaft 3 connected to a clutch 2, a counter shaft 4 connected to the input shaft 3 via a reduction gear mechanism RG, a counter shaft 4 and a transmission gear. And an output shaft 5 connected through a mechanism 6.

The input shaft 3 is rotatably supported on a support wall 1a ′ of the transmission case 1a via a ball bearing BRG.
One end (clutch 2 side) of the counter shaft 4 is rotatably supported by the support wall 1a ′ via the roller bearing RBRG, and is rotatably supported by the adapter plate 1b via the roller bearing RBRG at the intermediate portion. ing. The other end (the side opposite to the clutch 2 side) of the counter shaft 4 is rotatably supported by the extension case 1c via a bearing (not shown).
One end (clutch 2 side) of the output shaft 5 is rotatably supported coaxially at the rear end of the input shaft via a pilot bearing (not shown), and a ball bearing BRG is mounted on the adapter plate 1b at the intermediate portion. It is rotatably supported via. The other end (the side opposite to the clutch 2 side) of the output shaft 5 is rotatably supported by the extension case 1c via a needle bearing NBRG.

The transmission gear mechanism 6 is idled or fixedly arranged on a plurality of drive gears 6a, 6a fixedly or freely arranged on the input shaft 3 and the counter shaft 4 and on the output shaft 5 meshed with the plurality of drive gears 6a, 6a. A plurality of driven gears 6b, 6b, and a driving gear 6a configured as an idle gear and a synchronizing device 6c capable of selectively fixing the driven gear 6b to the output shaft 5, The transmission case 1a and the extension case 1c are housed.
In the figure, reference numeral 7 denotes a striking rod that can selectively operate the synchronization device 6c.

The transmission case 1 a is configured as a storage portion T capable of storing the lubricating oil O at the lower inside thereof, and the transmission gear mechanism 6 is lubricated by the stored lubricating oil O. That is, the rotating member such as the drive gear 6a or the synchronizer 6c provided on the outer periphery of the counter shaft 4 is rotated to scrape the lubricating oil O, and the meshing portion between the drive gear 6a and the driven gear 6b. Alternatively, the lubricating oil O is supplied to the engagement portion between the synchronization device 6c and the shift fork F.
A dynamic oil level holding member 8 for stably holding the dynamic oil level is disposed between the transmission case 1 a and the counter shaft 4.

2 is a cross-sectional view showing the XX cross section of FIG. 1, and FIG. 3 is a cross-sectional view showing the YY cross section of FIG.
As shown in FIG. 2, a pair of dynamic oil level holding members 8 are symmetrically arranged on both sides of the counter shaft 4, and the transmission case 1a is divided into an upper space Sa and a lower space Sb. That is, the dynamic oil level holding member 8 is formed from the inner wall side of the transmission case 1a to a position close to the outer peripheral surface of each of the counter shaft 4, the drive gears 6a, 6a and the synchronization device 6c as a rotating member. Along with the entire length of the transmission case 1a from the support wall 1a ′ of the transmission case 1a to the adapter plate 1b. Here, the dynamic oil level holding member 8 is attached and fixed to the support wall 1a ′ and the adapter plate 1b by engaging the claw 80 with an insertion recess (not shown) formed in the support wall 1a ′ and the adapter plate 1b. The

  Further, as shown in FIG. 3, each of the dynamic oil level holding members 8, 8 is close to the outer peripheral surface of the counter shaft 4, the drive gears 6a, 6a provided on the counter shaft 4, and the synchronizing device 6c, A rising rectification piece 8a that inclines toward the drive gear 6a and the synchronizer 6c from the lower side toward the upper side, and a lower rectification that is bent substantially horizontally toward the inner wall side of the transmission case 1a at the lower end of the rising rectification piece 8a. It comprises a piece 8b and a receiving part 8c connected to the upper end of the rising rectifying piece 8a. The receiving part 8c is lowered from the inner wall side of the case 1a of the transmission toward the drive gear 6a and the synchronizer 6c. A guide portion 8d that is formed in an inclined plate shape and rises in a curved shape along the circumferential direction with respect to the outer peripheral surface of the drive gear 6a and the synchronization device 6c at the end of the receiving portion 8c on the drive gear 6a and synchronization device 6c side. Is formed and is opposite to the guiding portion 8d. A hook piece 8e is integrally formed at the end of the side receiving portion 8c on the case 1a side so as to incline upward toward the transmission case 1a. Is formed.

Further, two oil drop holes 8f each penetrating in the vertical direction are provided on the guide portion 8d side from the upper end of the rising rectifying piece 8a of the receiving portion 8c of each dynamic oil level holding member 8, 8. Is formed.
The oil drop holes 8f and 8f are formed through the counter shaft 4, the drive gear 6a, and the synchronizer 6c as rotating members at positions shifted in the axial direction of the counter shaft 4 from the portion immersed in the lubricating oil O. Thus, the lubricating oil O scraped up by the drive gears 6a and 6a and the synchronization device 6c is configured not to scatter from the oil drop hole 8f into the upper space Sa above the receiving portion 8c.
Further, the lubricating oil O that has been scraped up and scattered in the upper space Sa can be satisfactorily received by the receiving portion 8c and returned to the lower storage portion T through the oil dropping hole 8f.

  In the lower space Sb, as shown in FIG. 3, the rising rectifying piece 8a, the lower rectifying piece 8b and the guiding portion 8d of the dynamic oil level holding members 8 and 8, the counter shaft 4, the drive gear 6a, and the synchronization The space S surrounded by the outer peripheral surface of each device 6c, the oil surface Oa of the lubricating oil O, and the inner wall of the transmission case 1a is set so that its volume is 0 or more and less than the volume of the lubricating oil O. The dynamic oil level holding members 8, 8 are disposed at positions where the space S having such conditions is formed. Accordingly, the lubricating oil O can enter each space S, but the entire lubricating oil O cannot enter.

Next, the movement of the lubricating oil O accompanying the operation of the transmission 1 configured as described above will be described.
First, consider the case where the rotational force accompanying the rotation of the counter shaft 4 as the rotating member, the drive gear 6a, and the synchronizing device 6c acts on the lubricating oil O.
FIG. 4 shows the rotation state of the drive gear 6a when the vehicle on which the transmission 1 is mounted moves forward.
When power is input to the transmission 1, the counter shaft 4, the drive gear 6a, and the synchronization device 6c rotate. When the counter shaft 4, the drive gear 6a, and the synchronizer 6c rotate, portions of the counter shaft 4, the drive gear 6a, and the synchronizer 6c that are immersed in the lubricating oil O act on the lubricating oil O, and the lubricating oil O In the transmission case 1a, an attempt is made to shift to the rotational direction side (left side direction in the figure).
At this time, the dynamic oil level holding member 8 suppresses the unevenness of the lubricating oil O. That is, most of the lubricating oil O that is about to scatter in the rotation direction collides with the dynamic oil level holding member 8 and the scatter is suppressed.
On the other hand, a part of the lubricating oil O colliding with the dynamic oil level holding member 8, particularly the rising rectifying piece 8a, is rectified in the direction of scattering, so that the guiding portion 8d, the counter shaft 4, the drive gear 6a, and the synchronizer 6c From the gaps between the respective outer peripheral surfaces, the oil is supplied to a portion requiring lubrication, such as a meshing portion between the driving gear 6a and the driven gear 6b and an engaging portion between the synchronizing device 6c and the shift fork F.
Here, since the guide portion 8d is formed in a curved shape along the circumferential direction with respect to the outer peripheral surfaces of the counter shaft 4, the drive gear 6a, and the synchronization device 6c, the lubricating oil O is directed toward the portion requiring lubrication. It can guide well.

In this way, the lubricating oil O supplied to the site requiring lubrication from the gap between the guide shaft 8d and the counter shaft 4, the drive gear 6a and the outer peripheral surface of the synchronizing device 6c as the rotating member lubricates the site requiring lubrication, and then the upper space. It is scattered in Sa.
Lubricating oil O scattered in the upper space Sa collides with the inner wall of the transmission case 1a and travels along the inner wall or is directly received by the receiving portion 8c, and is received by the lower space through the oil dropping hole 8f. Sb, that is, returned to the reservoir T.
Here, since the receiving portion 8c is formed in a bowl shape, it is possible to suppress the lubricating oil O received by the receiving portion 8c from being scraped up again by the counter shaft 4, the drive gear 6a, and the synchronization device 6c. The lubricating oil O can be quickly returned to the storage portion T through the oil dropping hole 8f.
Further, the oil dropping hole 8f is formed at a position shifted in the axial direction of the counter shaft 4 from the portion immersed in the lubricating oil O in the counter shaft 4, the drive gear 6a and the synchronization device 6c as the rotating member. It is assumed that the lubricating oil O scraped up by the portion immersed in the lubricating oil O of the counter shaft 4, the drive gear 6a, and the synchronizer 6c is difficult to scatter from the oil dropping hole 8f to the upper space Sa side.

Next, consider a case where an external force is applied to the lubricating oil O in the transmission 1 so that the oil level Oa is inclined in the left-right direction with respect to the vehicle traveling direction due to a sudden turn or the like in the vehicle on which the transmission 1 is mounted. . In this case, the lubricating oil O moves in the same manner as when the rotational force associated with the rotation of the counter shaft 4, the drive gear 6 a, and the synchronizer 6 c as a rotating member is applied.
That is, a force is applied to the lubricating oil O in the left-right direction (left-right direction in FIG. 4) with respect to the vehicle traveling direction due to the sudden turning of the vehicle, but most of the lubricating oil O to be shifted in the left-right direction. Collides with the dynamic oil level holding member 8, and scattering to the upper space Sa is suppressed.
On the other hand, a part of the lubricating oil O colliding with the dynamic oil level holding member 8, particularly the rising rectifying piece 8a, is rectified in the direction of scattering, so that the guiding portion 8d, the counter shaft 4, the drive gear 6a, and the synchronizer 6c From the gaps between the respective outer peripheral surfaces, the oil is supplied to a portion requiring lubrication, such as a meshing portion between the driving gear 6a and the driven gear 6b and an engaging portion between the synchronizing device 6c and the shift fork F (not shown).
The lubricating oil O supplied to the lubrication required portion is scattered in the upper space Sa after the lubrication necessary portion is lubricated. Then, the lubricating oil O scattered in the upper space Sa collides with the inner wall of the transmission case 1a and is transmitted along the inner wall or directly received by the receiving portion 8c, via the oil dropping hole 8f. It is returned to the lower space Sb, that is, the storage part T.

Next, the vehicle on which the transmission 1 is mounted is continuously climbed up and down, suddenly accelerated, suddenly braked, etc., and the lubricating oil O in the transmission 1 tilts the oil level Oa in the front-rear direction, which is the vehicle traveling direction. Consider the case where an external force is applied.
FIG. 5 is a state diagram showing a state in which the lubricating oil O in the storage portion T is shifted rearward with respect to the vehicle traveling direction due to continuous climbing or rapid acceleration of the vehicle on which the transmission 1 is mounted. These are the state diagrams which show the state which the lubricating oil O in the storage part T has shifted to the front side with respect to the vehicle advancing direction because the vehicle carrying the transmission 1 carried out the continuous descent or sudden braking.

When the vehicle on which the transmission 1 is mounted is continuously climbed or suddenly accelerated, a force is applied to the lubricating oil O in the storage portion T so as to be shifted rearward with respect to the vehicle traveling direction. As shown in the figure, the dynamic oil level holding member 8 suppresses the movement of the majority of the lubricating oil O that tends to move backward to the rear side.
Here, since the dynamic oil level holding member 8 is formed from the support wall 1a ′ of the transmission case 1a to the adapter plate 1b, it is possible to effectively suppress the deviation of the lubricating oil O toward the rear side. . Moreover, the rising rectifying piece 8a, the lower rectifying piece 8b and the guiding portion 8d of the dynamic oil level holding member 8, the outer peripheral surfaces of the counter shaft 4, the drive gear 6a and the synchronizing device 6c, and the oil level Oa of the lubricating oil O And the space S surrounded by the inner wall of the transmission case 1a is disposed at a position where the volume of the space S is 0 or more and less than or equal to the volume of the lubricating oil O. It is possible to suppress the occurrence of a portion where the volume of the lubricating oil O becomes zero. That is, it is possible to suppress the occurrence of a state in which the drive gear 6a disposed on the front side in the vehicle traveling direction in the transmission case 1 is not immersed in the lubricating oil O. As a result, the lubrication performance can be improved.

On the other hand, when the vehicle on which the transmission 1 is mounted is continuously downhill or suddenly braked, the lubricating oil O in the storage portion T is subjected to a force that is offset forward with respect to the vehicle traveling direction. As shown in FIG. 6, the dynamic oil level holding member 8 suppresses the movement of the majority of the lubricating oil O that is about to move forward to the front side.
At this time, the dynamic oil level holding member 8 has a volume of the space S of 0 or more and a volume of the lubricating oil O or less, as in the case where the vehicle equipped with the transmission 1 is continuously climbed or suddenly accelerated. Since it is arrange | positioned in such a position, it can suppress that the lubricating oil O in the back side becomes 0 even after the lubricating oil O has shifted to the front side. That is, it is possible to suppress the occurrence of a state in which the drive gear 6a and the synchronization device 6c disposed on the rear side in the vehicle traveling direction in the transmission case 1 are not immersed in the lubricating oil O. As a result, the lubrication performance can be improved.

Next, in FIG. 7, the modification of the dynamic oil level holding member 8 is shown.
The dynamic oil level holding member 8 in FIG. 7 is substantially the same as that in FIG. 3 in the shape of the rising rectifying piece 8a and the lower end rectifying piece 8b at the lower end thereof. 4, an upper end rectifying piece 8g extending substantially horizontally toward the upper periphery of the drive gear 6a and the synchronization device 6c is formed, and a substantially hanging shape is formed at the tip of the upper end rectification piece 8g above the outer periphery of the drive gear 6a and the synchronization device 6c. A hanging piece 8h is integrally formed.
The rising rectifying piece 8a, the lower rectifying piece 8b, the upper rectifying piece 8g, and the hanging piece 8h of the dynamic oil level holding member 8, the outer peripheral surfaces of the counter shaft 4, the drive gear 6a and the synchronizer 6c, and the lubricating oil O A dynamic oil level holding member is formed such that a space S surrounded by the oil level Oa and the inner wall of the transmission case 1a is formed, and the volume of the space S is 0 or more and less than or equal to the volume of the lubricating oil O. 8 positions are set. The lower end rectifying piece 8b is formed with a through hole-shaped oil dropping hole 8f that communicates the upper space Sa and the lower space Sb. The oil drop hole 8f is formed through the counter shaft 4, the drive gear 6a, and the synchronizer 6c as rotating members at positions shifted in the axial direction of the counter shaft 4 from the portion immersed in the lubricating oil O.
The dynamic oil level retaining member 8 is formed over the entire length of the transmission case 1a from the support wall 1a 'of the transmission case 1a to the adapter plate 1b.

In the transmission 1 provided with the dynamic oil level holding member 8 shown in FIG. 7, when the countershaft 4, the drive gear 6a, and the synchronizer 6c rotate, the lubricating oil O is prevented from scattering into the upper space Sa. In addition to being able to be suppressed by the target oil level holding member 8, the lubricating oil O in the storage portion T is scraped up and supplied satisfactorily to a portion requiring lubrication such as a meshing portion between the drive gear 6a and the driven gear 6b. be able to.
Here, a force that causes the drooping piece 8h to return to the storage portion T acts on most of the lubricating oil O that has been scraped up, and the lubricating oil O is effectively returned to the storage portion T. As a result, it is possible to more effectively suppress scattering of the lubricating oil O that is scraped up into the upper space Sa.
On the other hand, a part of the lubricating oil O colliding with the dynamic oil level holding member 8, particularly the rising rectifying piece 8a, is rectified in its scattering direction so that the drooping piece 8h, the counter shaft 4, the drive gear 6a and the synchronizing device 6c Supplied from the gaps between the respective outer peripheral surfaces to portions requiring lubrication, such as meshing portions between the drive gear 6a and the driven gear 6b. The lubricating oil O scattered in the upper space Sa after lubricating the necessary portion of the lubricant collides with the inner wall of the transmission case 1a, or is transmitted on the inner wall or directly received on the lower end rectifying piece 8b. Then, the oil is returned to the lower space Sb, that is, the storage portion T through the oil dropping hole 8f formed in the lower end rectifying piece 8b.

Further, even when an external force for inclining the lubricating oil O as shown in FIG. 5 or FIG. 6 is applied, the lower end rectifying piece 8b, the rising rectifying piece 8a and the upper end rectifying piece 8g of the dynamic oil level holding member 8 are applied. Can suppress the displacement of the lubricating oil O in the front-rear and left-right directions, and can effectively suppress the inclination of the lubricating oil O.
That is, the inclination of the lubricating oil O can be suppressed so that there is no portion immersed in the lubricating oil O in the lower part of the counter shaft 4, the driving gear 6a, or the synchronizing device 6c, which is a rotating member. Even at times, the lubricating oil O can be scraped up by the rotation of the drive gear 6a or the synchronizer 6c, and can be satisfactorily supplied to the portion requiring lubrication.

Next, FIG. 8 shows a further modification of the dynamic oil level holding member 81.
The dynamic oil level holding member 81 in FIG. 8 is inclined upward from the lower end of the fixing portion 81a fixed to the inner wall of the transmission case 1a toward the counter shaft 4, the drive gear 6a or the synchronization device 6c. An inclined guide part 81b is formed, and a receiving part 81c extending substantially horizontally toward the countershaft 4, the drive gear 6a or the synchronizer 6c is formed at the upper end of the fixed part 81a. The holding member 81 has a substantially triangular cross section.
Surrounded by the guide portion 81b of the dynamic oil level holding member 81, the outer peripheral surface of the counter shaft 4, the drive gear 6a and the synchronizer 6c, the oil level Oa of the lubricating oil O, and the inner wall of the case 1a of the transmission. A space S is formed, and the arrangement position of the dynamic oil level holding member 81 is set so that the volume of the space S is 0 or more and less than or equal to the volume of the lubricating oil O. The dynamic oil level retaining member 81 is formed over the entire length of the transmission case 1a from the support wall 1a 'of the transmission case 1a to the adapter plate 1b.

Also in this example, most of the lubricating oil O scraped up by the rotation of the counter shaft 4, the drive gear 6 a, or the synchronizer 6 c collides with the dynamic oil level holding member 81, thereby scattering into the upper space Sa. It is suppressed.
On the other hand, a part of the lubricating oil colliding with the dynamic oil level holding member 81, in particular the guiding part 81b, is rectified in its scattering direction, and the upper end of the guiding part 81b, the counter shaft 4, the drive gear 6a and the synchronizing device 6c are each Is supplied to a portion requiring lubrication, such as a meshing portion between the drive gear 6a and the driven gear 6b, from a gap with the outer peripheral surface of the motor. Lubricating oil O after lubricating the necessary lubrication site is scattered in the upper space Sa, collides with the inner wall of the transmission case 1a, or is received on the inner wall or directly received by the receiving portion 81c. The portion 81b is returned to the storage portion T through a gap between the counter shaft 4, the outer peripheral surfaces of the drive gear 6a and the synchronization device 6c.

Further, even when an external force that inclines the lubricating oil O as shown in FIG. 5 or FIG. 6 is applied, the dynamic oil level holding member 81 shifts the lubricating oil O in the front-rear and left-right directions with respect to the vehicle traveling direction. And the inclination of the lubricating oil O can be effectively suppressed.
That is, it is possible to suppress the inclination of the lubricating oil O so that there is no portion immersed in the lubricating oil O in the lower part of the driving gear 6a or the synchronizing device 6c that is a rotating member. Lubricating oil O can be scraped up by the rotation of the drive gear 6a or the synchronizer 6c and can be satisfactorily supplied to the portion requiring lubrication.

Furthermore, in FIG. 9, the example of a change of the further dynamic oil level holding member 82 is shown.
In FIG. 9, a plate-like dynamic oil level holding member 82 extending substantially horizontally toward the countershaft 4, the drive gear 6a or the synchronizer 6c protrudes from a fixed portion 82a fixed to the inner wall of the transmission case 1a. The inner end of the dynamic oil level holding member 82 on the counter shaft 4, drive gear 6a or synchronizer 6c side is an inclined guiding portion 82b inclined upward from below. The plate-like dynamic oil level holding member 82 has a rectifying surface 82c on its lower surface and a receiving surface 82d on its upper surface.
The dynamic oil level holding member 82 is surrounded by the flow straightening surface 82c, the counter shaft 4, the outer peripheral surface of the drive gear 6a and the synchronization device 6c, the oil level Oa of the lubricating oil O, and the inner wall of the transmission case 1a. A space S is formed, and the arrangement position of the dynamic oil level holding member 82 is set so that the volume of the space S is 0 or more and less than or equal to the volume of the lubricating oil O. The dynamic oil level retaining member 82 is formed over the entire length of the transmission case 1a from the support wall 1a 'of the transmission case 1a to the adapter plate 1b.

Also in this example, most of the lubricating oil O scraped up by the rotation of the counter shaft 4, the drive gear 6a, or the synchronizer 6c collides with the dynamic oil level holding member 82, so that the upper space Sa is scattered. It is suppressed.
On the other hand, a part of the lubricating oil colliding with the dynamic oil level holding member 82, particularly the flow straightening surface 82c, is rectified in its scattering direction, and the outer periphery of each of the guide portion 82b, the counter shaft 4, the drive gear 6a and the synchronization device 6c. It is supplied to a portion requiring lubrication, such as a meshing portion between the driving gear 6a and the driven gear 6b, from a gap with the surface. Then, the lubricating oil O after lubrication of the lubrication required part is scattered in the upper space Sa, and collides with the inner wall of the transmission case 1a, and is received by the receiving surface 82d while being transmitted through the inner wall. The receiving surface 82d and the countershaft 4, the drive gear 6a and the outer peripheral surface of the synchronization device 6c are returned to the storage portion T through the gaps between them.

Further, even when an external force for inclining the lubricating oil O as shown in FIG. 5 or FIG. 6 is applied, the dynamic oil level holding member 82 shifts the lubricating oil O in the front-rear and left-right directions with respect to the vehicle traveling direction. And the inclination of the lubricating oil O can be effectively suppressed.
That is, it is possible to suppress the inclination of the lubricating oil O so that there is no portion immersed in the lubricating oil O in the lower part of the driving gear 6a or the synchronizing device 6c that is a rotating member. Lubricating oil O can be scraped up by the rotation of the drive gear 6a or the synchronizer 6c and can be satisfactorily supplied to the portion requiring lubrication.

Next, FIG. 10 is a plan configuration diagram corresponding to FIG. 2 showing a modification of the dynamic oil level holding member 8.
The dynamic oil level holding member 8 in FIG. 10 includes a rising rectifying piece 8a, a lower end rectifying piece 8b, a guiding portion 8d, and a flange piece 8e, and the configuration of the receiving portion 8c formed in a bowl shape is that of FIG. However, instead of the oil drop hole 8f formed of a circular through hole, a total of four oil drop holes 8f and 8f extending in a slit shape are formed in the receiving portion 8c by opening the guide portion 8d side. Is.
The notch-shaped oil drop holes 8f and 8f are located at positions shifted in the axial direction of the countershaft 4 from the portion immersed in the lubricating oil O in the countershaft 4, the drive gear 6a and the synchronizer 6c as rotating members. The lubricating oil O that is formed so as to penetrate and is scraped up by the drive gears 6a and 6a and the synchronizer 6c does not scatter from the oil dropping holes 8f and 8f into the upper space Sa above the receiving portion 8c. Has been.
In this example, the lubricating oil O falling on the receiving portion 8c can be quickly returned to the storage portion T side through the notched oil drop holes 8f and 8f.

FIG. 11 shows a further modification.
The transmission 1 shown in FIG. 11 differs from the above-described embodiment in that the counter shaft 4, the input shaft 3, and the output shaft 5 are arranged in the left-right direction in the drawing.
In such a case, the function of guiding the lubricating oil to the meshing portions of the gears 6a and 6b is not necessary, and a hanging rib 1d is provided above the meshing portions of the gears 6a and 6b so as to hang down from the transmission case 1a. The lubricating oil O splashed upward can be dropped from the hanging rib 1d onto the meshing portion of the lower drive gear 6a and the driven gear 6b to lubricate the meshing portion.

Also in such a transmission 1, the dynamic oil level holding members 82, 82 projecting substantially horizontally from the inner wall side of the transmission case 1a to positions close to the outer peripheral surfaces of the drive gear 6a and the driven gear 6b are provided on both sides. And a space S surrounded by the dynamic oil level holding members 82, 82, the outer peripheral surfaces of the drive gear 6a and the driven gear 6b, the oil level Oa of the lubricating oil O, and the inner surface of the transmission case 1a. The dynamic oil level holding member 82 can be installed at a position where the volume is not less than 0 and not more than the volume of the lubricating oil O.
The dynamic oil level holding member 82 is formed in a plate shape, the upper surface is a receiving surface 82d, the lower surface is a rectifying surface 82c, and the inner end is an induction inclined upward toward the gears 6a and 6b. A portion 82 b is formed, and the dynamic oil level holding member 82 is formed along the counter shaft 4 and the output shaft 5 to have a length that covers almost the entire length of the transmission case 1 a.

Even in such a configuration, most of the lubricating oil O scraped up by the rotation of the counter shaft 4, the drive gear 6 a, or the synchronization device 6 c collides with the dynamic oil level holding member 82, so that the upper space Sa enters the upper space Sa. Scattering is suppressed.
On the other hand, a part of the lubricating oil colliding with the dynamic oil level holding member 82, particularly the flow straightening surface 82c, is rectified in its scattering direction, and the outer periphery of each of the guide portion 82b, the counter shaft 4, the drive gear 6a and the synchronization device 6c. It is supplied to a portion requiring lubrication, such as a meshing portion between the driving gear 6a and the driven gear 6b, from a gap with the surface. Then, the lubricating oil O after lubrication of the lubrication required part is scattered in the upper space Sa, and collides with the inner wall of the transmission case 1a, and is received by the receiving surface 82d while being transmitted through the inner wall. The receiving surface 82d and the countershaft 4, the drive gear 6a and the outer peripheral surface of the synchronization device 6c are returned to the storage portion T through the gaps between them.
Further, even when an external force that inclines the lubricating oil O acts, the dynamic oil level holding member 82 can suppress the displacement of the lubricating oil O in the front-rear and left-right directions with respect to the vehicle traveling direction, and the lubricating oil O inclines. This can be effectively suppressed.
That is, it is possible to suppress the inclination of the lubricating oil O so that there is no portion immersed in the lubricating oil O in the lower portions of the gears 6a and 6b, which are rotating members, and even when the lubricating oil O is inclined, the drive gear 6a. Alternatively, the lubricating oil O can be scraped up by the rotation of the synchronizer 6c and can be satisfactorily supplied to the portion requiring lubrication.

  In the embodiment including the above-described modification, the dynamic oil level holding members 8, 81, 82 are arranged symmetrically on both sides of the counter shaft 4. However, for example, the lubricating oil O is disposed in the vehicle traveling direction. On the other hand, in the case where a force that moves to only one side in the left-right direction is applied, the dynamic oil level holding members 8, 81, 82 are arranged only on one side of the counter shaft 4. It does not matter.

  In the embodiment including the above-described modification, the dynamic oil level holding members 8, 81, 82 are formed over the entire length of the transmission case 1a from the support wall 1a 'of the transmission case 1a to the adapter plate 1b. However, the dynamic oil level retaining members 8, 81, 82 are, for example, the length from the support wall 1a ′ of the transmission case 1a to the front of the adapter plate 1b, or from the adapter plate 1b to the support wall 1a ′. It does not matter if it does not cover the entire length of the transmission case 1a from the support wall 1a 'of the transmission case 1a to the adapter plate 1b, such as the length up to this side.

  In the embodiment including the above-described modification, the dynamic oil level holding members 8, 81, 82 are engaged portions of the driving gear 6a and the driven gear 6b with the lubricating oil O scraped up by the driving gear 6a or the synchronization device 6c. In addition, the guide portions 8d, 81b, and 82b that can be guided to lubrication-needed portions such as the engaging portion between the synchronization device 6c and the shift fork F are provided, but the guide portions 8d, 81b, and 82b may be omitted.

  In the embodiment including the above-described modification, the dynamic oil level holding members 8, 81, 82 are formed so as to be close to all the outer peripheral surfaces of the counter shaft 4, the drive gears 6a, 6a and the synchronizer 6c as rotating members. However, it does not have to be close to all the outer peripheral surfaces of the counter shaft 4, the drive gears 6a and 6a, and the synchronization device 6c. For example, it may be formed so as to be close to only the outer peripheral surface of the drive gears 6a, 6a and the synchronizing device 6c, or may be formed so as to be close to only the outer peripheral surface of the synchronizing device 6c.

  In the embodiment including the above-described modification, the oil drop hole 8f of the dynamic oil level holding members 8, 81, 82 is formed in the lubricating oil O among the counter shaft 4, the drive gear 6a, and the synchronizer 6c as rotating members. The oil drop hole 8f of the dynamic oil level holding member 8, 81, 82 is a rotating member in the axial direction of the counter shaft 4 although it is formed so as to penetrate at a position shifted in the axial direction of the counter shaft 4 from the portion to be immersed. The counter shaft 4, the drive gear 6a, and the synchronizer 6c may be formed at the same position as the portion immersed in the lubricating oil O.

  In the embodiments including the above-described modifications, the dynamic oil level holding members 8, 81, 82 are formed separately from the transmission case 1a. However, the dynamic oil level holding members 8, 81, 82 are provided. May be formed integrally with the transmission case 1a.

  As mentioned above, although embodiment of this invention was described using the Example, this invention is not limited to such an Example, In the range which does not deviate from the summary of this invention, it can implement with a various form. Of course.

It is a schematic longitudinal cross-sectional block diagram of a transmission. It is a principal part plane block diagram which shows the XX cross section of FIG. It is YY sectional drawing of FIG. It is action explanatory drawing which shows the scraping state of the lubricating oil at the time of vehicle advance in a YY cross section. It is a schematic block diagram of the transmission which shows the inclination state of the transmission at the time of continuous climbing. It is a schematic block diagram of the transmission which shows the inclination of the transmission at the time of continuous descent. FIG. 4 is a YY cross-sectional view corresponding to FIG. 3, showing a modification of the dynamic oil level holding member installed in the transmission. FIG. 6 is a YY cross-sectional view corresponding to FIG. 3 showing a modification of a different dynamic oil level holding member. FIG. 6 is a YY sectional view corresponding to FIG. 3 and showing a modified example of a different dynamic oil level holding member. It is a plane block diagram corresponding to FIG. 2 at the time of changing the oil drop hole of a dynamic oil level holding member. FIG. 4 is a YY sectional view corresponding to FIG. 3 of the transmission when the gear arrangement is in the left-right direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission 1a Case 1a 'Support wall 1b Adapter plate 1d Hanging rib 3 Input shaft 4 Counter shaft 5 Output shaft 6 Transmission mechanism 6a Drive gear 6b Driven gear 6c Synchronizer 8 Dynamic oil level holding member 8a Standing rectifier 8b Lower end rectifying piece 8c Receiving portion 8d Guide portion 8e Hook piece 8f Oil drop hole 8g Upper end rectifying piece 8h Drooping piece 80 Claw portion 81 Dynamic oil level holding member 81a Fixing portion 81b Guide portion 81c Receiving portion 82 Dynamic oil level holding member 82b Guide part 82c Rectifying surface 82d Receiving surface Sa Upper space S Space T Storage part O Lubricating oil Oa Oil surface

Claims (9)

A transmission mechanism that includes a rotating member; and a transmission case that houses the transmission mechanism and has a storage portion that stores lubricating oil, and is scraped up by an immersion portion immersed in the lubricating oil among the rotating members. A transmission that lubricates at least a part of each part of the transmission mechanism directly or indirectly using a lubricating oil,
A dynamic oil level holding member protruding from the inner wall side of the transmission case to a position close to the outer peripheral surface of the rotating member;
The dynamic oil level holding member has a volume of the space surrounded by the dynamic oil level holding member, the rotating member, the oil level of the lubricating oil, and the inner surface of the transmission case of 0 or more. A transmission that is arranged at the following position.   The transmission according to claim 1, wherein the dynamic oil level holding member is provided on both sides of the rotating member.   The transmission according to claim 1 or 2, wherein the dynamic oil level holding member is formed to have a length that extends over the entire length of the transmission case.   The dynamic oil level holding member is formed in a shape capable of guiding at least a part of the lubricating oil scraped up by the immersion part of the rotating member to at least a part of each part of the transmission mechanism. The transmission according to claim 3.   The transmission according to claim 4, wherein at least a part of the dynamic oil level holding member is formed in a shape along a circumferential direction with respect to an outer peripheral surface of the rotating member.   6. A lubricating oil return portion capable of returning the lubricating oil scattered in the upper space opposite to the space across the dynamic oil level holding member to the storage portion. A transmission according to any one of the above.   The transmission according to claim 6, wherein the lubricating oil return portion is a through hole that penetrates the dynamic oil level holding member from the upper space side to the space side.   The transmission according to claim 7, wherein the through hole is formed at a position shifted from the immersion part in the axial direction of the rotating member.   The transmission according to any one of claims 6 to 8, wherein the dynamic oil level holding member has a surface on the upper space side formed in a bowl shape.

Images