JP2014190431A - Gear transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear transmission having a lubricating structure for efficiently supplying lubricating oil to a specified lubricated section which tends to be short in the lubricating oil.SOLUTION: The gear transmission includes a case filled with the lubricating oil, a shaft member journaled to the case for transmitting power, a plurality of sets of gear pairs which are provided on the shaft member for selectively engaging and joining one another to actualize a predetermined gear ratio, and at least part of which rakes up the lubricating oil, and a tray-shaped oil receiver 6 arranged in the case at the upper part of its internal space for trapping the raked up and flown lubricating oil and guiding it to the lubricated section. The oil receiver 6 includes a plurality of protruded strips 661, 662, 663 provided in parallel to one another on an outside face 611 thereof, extending while inclining in the axial length direction of the shaft member, for trapping the lubricating oil with its viscosity and guiding it along the inclination, and a dropping member (a dropping pipe 68) erected from near the inclined lower ends of the plurality of protruded strips downward to the specified lubricated section for dropping the lubricating oil.

Description

  The present invention relates to a gear transmission used in a vehicle or the like, and more particularly to a lubricating structure inside the transmission.

  There is a gear transmission for a vehicle that includes a shaft member and a plurality of sets of gear pairs, and selects a gear pair by an actuator operation or a manual operation to realize a predetermined gear ratio. In this type of transmission, lubricating oil is enclosed in the casing to smooth the operation of the bearings, synchronizers, gear meshing parts, etc. In general, a lubricating structure for circulation is adopted. As a structure for circulating and supplying lubricating oil, a scraping method and an in-shaft oil passage method are widely used. The scraping system uses splashing of lubricating oil scraped up by a gear, and a technique for capturing the lubricating oil using a saucer-shaped oil receiver has been put into practical use. In the in-shaft oil passage system, a technique for introducing lubricating oil from the in-shaft oil passage to the lubrication target portion around the shaft has been put into practical use.

  The applicant of the present application discloses a countermeasure for a case where the amount of oil supplied to a specific lubrication target portion is insufficient in the gear transmission in Patent Document 1. The gear transmission of Patent Document 1 has a plate-shaped oil dropping member suspended in a case, which is disposed above a portion to be lubricated and has a sloping lower edge and traps and drops dripping lubricating oil by its viscosity. doing. Thereby, in addition to the lubrication of the prior art using an oil receiver or an in-shaft oil passage, the lubricating oil can be directly supplied from the oil dripping member to a specific lubrication target portion to perform good lubrication.

JP 2009-297712 A

  By the way, even if the oil dripping member of Patent Document 1 is used, depending on the internal structure and operation state of the transmission, it is not always possible to sufficiently lubricate all the lubrication target parts. For example, in a vehicle transmission in which an input shaft and an output shaft are arranged in front and rear with a common axis, and a counter shaft is arranged below both shafts, the amount of lubricant scattered in the vicinity of the output shaft that does not rotate during idling Decrease. For this reason, even if an oil dripping member is suspended above the output shaft, a sufficient amount of lubricating oil cannot be captured, and the periphery of the output shaft cannot be sufficiently lubricated. When the vehicle is started from such a state, there is a concern that the amount of lubricating oil is insufficient around the output shaft and wear and seizure occur.

  The present invention has been made in view of the above-described problems of the background art, and provides a gear transmission having a lubrication structure that efficiently supplies lubricating oil to a specific lubrication target portion where the lubricating oil tends to be insufficient. Providing is a problem to be solved.

  A gear transmission according to the present invention has a predetermined gear ratio by a case in which lubricating oil is enclosed, a shaft member that is supported by the case and transmits power, and is selectively meshed with the shaft member. A plurality of pairs of gear pairs that are realized and at least a part of which is configured to scoop up the lubricating oil, and a tray that is disposed above the internal space of the case, captures the lubricating oil that is scooped up and fly, and guides it to the lubrication target site The oil receiver is provided in parallel to each other on the outer surface of the gear transmission and extends while inclining in the axial length direction of the shaft member. A plurality of ridges captured by the viscosity and guided along an inclination; and a dropping member which is erected downward from the vicinity of the inclined lower ends of the plurality of ridges toward a specific lubrication target portion and drops the lubricating oil; Have.

  Furthermore, the oil receiver further includes a damming ridge provided near the inclined lower end of the plurality of ridges, for damming the lubricating oil guided by the plurality of ridges and guiding the lubricating oil to the dropping member. Is preferred.

  Furthermore, the oil receiver has a plurality of oil compartments partitioned by a partition, and any one of the oil compartments has a hollow dropping pipe for dropping lubricating oil toward the specific lubrication target portion, and the dropping pipe May also serve as the dropping member.

  Further, the specific lubrication target portion may be a synchronization device that synchronously operates a gear that does not rotate during idling but rotates during power transmission.

  In the gear transmission according to the present invention, a plurality of inclined ridges are provided on the outer surface of the oil receiver so as to capture the incoming lubricating oil, guide it along the inclination, and drop it from the dropping member toward the specific lubrication target site. did. On the other hand, the oil receiver of the prior art uses only the lubricating oil captured and stored inside, and does not use the lubricating oil flying to the outer surface. Therefore, according to the present invention, the outer surface of the oil receiver that has not been used in the past is effectively used, and the lubricating oil is supplied from the protrusion on the outer surface to the specific lubrication target portion via the dropping member, thereby achieving good lubrication. It can be performed. In particular, for the specific lubrication target part where the amount of lubricating oil that is likely to be insufficient depending on the internal structure and operating conditions of the transmission, the ridge guides the lubricating oil to move from the front or rear in the axial direction, A sufficient amount of lubricating oil can be supplied.

  Furthermore, in the aspect having the damming ridge, it is possible to prevent the lubricating oil guided to the ridge from passing over the specific lubrication target portion. Thereby, the lubricating oil is guided to the dropping member and reliably dropped toward the specific lubrication target site. Therefore, most of the lubricating oil captured by the protrusions can be supplied to the specific lubrication target portion, and good lubrication can be reliably performed.

  Furthermore, in the aspect in which the oil receiver has a plurality of oil compartments, and any of the oil compartments has a drip pipe, the oil lubrication part inside the oil receiver and the protrusion on the outer side face the specific lubrication target site. Lubricating oil can be supplied and good lubrication can be reliably performed. Moreover, since the dropping pipe also serves as the dropping member, it is possible to suppress complication of the oil receiver shape.

  Furthermore, in a mode in which the specific lubrication target portion is a synchronous device that synchronously operates a gear that does not rotate during idling but rotates during power transmission, the amount of scattering of the lubricating oil is increased by the amount that the gear does not scoop up the lubricating oil during idling. It tends to be deficient in lubricating oil due to a decrease in power transmission. Still, the plurality of inclined ridges guide the lubricant to move from the distant position to the dropping member, so that a sufficient amount of lubricant can be supplied to the synchronization device.

It is a side view explaining the gear transmission of the embodiment of the present invention. FIG. 3 is a side view of a 4-speed-5-speed synchronizer that is a specific lubrication target portion of the present invention and its vicinity. It is sectional drawing which looked at the synchronous apparatus for 4th-5th and its vicinity from the rear side. It is a top view which shows the detailed structure of the oil receiver of the gear transmission of embodiment. It is a side view of the oil receiver seen from the paper surface back side of FIG. It is the cross-sectional view of the oil receiver seen from the arrow XX direction of FIG. It is a side view of the oil receiver of a prior art. It is a cross-sectional view of a conventional oil receiver.

The form for implementing this invention is demonstrated with reference to FIGS.
FIG. 1 is a side view illustrating a gear transmission 1 according to an embodiment of the present invention. The gear transmission 1 according to the embodiment has five forward speeds and one reverse speed, and is mounted vertically on a front engine rear drive vehicle (FR vehicle). The gear transmission 1 includes a case 2, an input shaft 31, an output shaft 32, a counter shaft 33, forward 1st to 4th and reverse gear pairs 41D to 44D, 41F to 44F, 46D, 46F, and 3 synchronization devices. 51-53 and the oil receiver 6 grade | etc.,. In FIG. 1, the left side of the gear transmission 1 is the front side connected to the engine, and the right side of the page is the rear side reaching the rear drive wheel. Further, in FIG. 1, the case 2, the output shaft 32, and a part of the gear are shown in cross section.

  An appropriate amount of lubricating oil is sealed in the case 2 and stays at the bottom, and is circulated for use. The input shaft 31 and the output shaft 32 are arranged in the front-rear direction with the axis A1 in common, and each extend in the front-rear direction. The output shaft 32 is rotatably supported on the case 2 by two bearing portions 323 and 324. An output driven gear 47F is fixed to the outer periphery on the front side of the output shaft 32. A bearing hole is formed in the front shaft center of the output shaft 32, and a bearing portion 326 is disposed on the inner peripheral surface of the bearing hole. A rear end 322 of the output shaft 32 is connected to a propeller shaft (not shown) via a drum brake 329.

  The input shaft 31 is rotatably supported on the case 2 by a bearing portion 313 at a front side thereof, and a rear end 312 thereof is rotatably supported by a bearing portion 326 of a bearing hole of the output shaft 32. A front end 311 of the input shaft 31 is connected to a crankshaft of an engine (not shown) via a clutch mechanism (not shown). A reverse drive gear 46D, a first speed drive gear 41D, a third speed drive gear 43D, and a second speed drive gear 42D are fixed to the outer periphery of the input shaft 31 in order from the front side. A four-speed drive gear 44D is disposed on the rear side of the second-speed drive gear 42D on the outer periphery of the input shaft 31 so as to be free-wheeling using a needle bearing having a reference numeral.

  The counter shaft 33 is disposed below the input shaft 31 and the output shaft 32 and extends in the front-rear direction. The axis A2 of the counter shaft 33 is parallel to the axis A1 of the input shaft 31 and the output shaft 32. A front end 331 and a rear end 332 of the counter shaft 33 are rotatably supported by the case 2 by bearing portions 333 and 334, respectively. On the outer periphery of the counter shaft 33, a reverse driven gear 46F, a first speed driven gear 41F, a third speed driven gear 43F, and a second speed driven gear 42F can be idled by using a needle bearing with a reference numeral in order from the front side. It is arranged. A 4-speed driven gear 44F is fixed on the rear side of the second-speed driven gear 42F on the outer periphery of the counter shaft 33, and an output drive gear 47D is fixed on the rear side of the 4-speed driven gear 44F.

  An axial oil passage 335 extending in the direction of the axis A2 is bored in the axis of the counter shaft 33. Further, radial oil passages 336 are bored radially outward from four locations in the axial length direction of the axial oil passage 335. The four radial oil passages 336 pass through the counter shaft 33 and communicate with the needle bearings of the reverse driven gear 46F, the first speed driven gear 41F, the third speed driven gear 43F, and the second speed driven gear 42F. The axial oil passage 335 and the radial oil passage 336 have a role of supplying lubricating oil to the needle bearing which is a lubrication target portion.

  The reverse drive gear 46D of the input shaft 31 and the reverse drive gear 46F of the counter shaft 33 constitute a reverse gear pair and mesh with each other via a reverse gear not shown in the drawing. The first speed drive gear 41D of the input shaft 32 and the first speed driven gear 41F of the counter shaft 33 constitute a first speed gear pair and mesh with each other. Similarly, the 2nd to 4th drive gears 42D to 44D and the 2nd to 4th driven gears 42F to 44F constitute a 2nd to 4th gear pair and mesh with each other. Further, a fifth-speed direct coupling portion 45 is provided between the rear end 312 of the input shaft 31 and the output driven gear 47F of the output shaft 32. The 5-speed direct connection portion 45 has a function of directly connecting the input shaft 31 and the output shaft 32 so that they can be disconnected. The output drive gear 47D of the counter shaft 33 and the output driven gear 47F of the output shaft 32 constitute an output gear pair and mesh with each other.

  The three synchronizers 51 to 53 are a first speed-reverse synchronizer 51, a second speed-3 speed synchronizer 52, and a fourth speed-5 speed synchronizer 53. The first-speed-reverse synchronizer 51 is disposed between the counter-driven gear 46F and the first-speed driven gear 41F. The first-speed-reverse synchronizer 51 selects one of the reverse driven gear 46F and the first speed driven gear 41F and synchronously couples it to the counter shaft 33. The second-speed / third-speed synchronization device 52 is disposed between the second-speed driven gear 42F and the third-speed driven gear 43F of the counter shaft 33. The second-speed / third-speed synchronization device 52 selects one of the second-speed driven gear 42F and the third-speed driven gear 43F and synchronously couples it to the counter shaft 33.

  On the other hand, the 4-speed-5-speed synchronization device 53 is disposed between the 4-speed drive gear 44 </ b> D of the input shaft 31 and the 5-speed direct connection portion 45. The 4-speed-5-speed synchronizer 53 selects one of an operation of synchronously coupling the 4-speed drive gear 44D to the input shaft 31 and an operation of synchronously coupling the output shaft 32 to the input shaft 31 by the 5-speed direct coupling portion 45. Do it. Each of the synchronization devices 51 to 53 can be a known device that combines a sleeve that moves in the axial direction, a synchronizer ring having a cone-shaped engagement surface that frictionally engages, and the like.

  The oil receiver 6 is disposed in the upper part of the internal space of the case 2. The oil receiver 6 is in the shape of an elongated tray extending in the front-rear direction, and is disposed so as to be inclined at a high level on the front side and low on the rear side. As will be described in detail later, the interior of the oil receiver 6 is partitioned into a plurality of oil partition portions by partitioning. The oil receiver 6 captures the lubricating oil that is scooped up by the gears and flies, and guides it to the site to be lubricated.

  Next, the lubrication structure of the gear transmission 1 according to the embodiment will be described. When the gear transmission 1 is transmitting power output from the engine, all three axes of the input shaft 31, the output shaft 32, and the counter shaft 33 rotate. Therefore, all the gears 41F to 44F, 46F, and 47D provided on the counter shaft 33 are automatically lubricated by being immersed in the lubricating oil staying at the bottom of the case 2 and the lubricating oil. Is lifted up and scattered in the case 2. The gears 41D to 44D, 46D of the input shaft 31 and the output driven gear 47F of the output shaft 32, which are arranged away from the bottom of the case 2, mesh with the oil-immersed gears 41F to 44F, 46F, 47D of the counter shaft 33. Lubricating oil is supplied. The gears 41 </ b> D to 44 </ b> D, 46 </ b> D, and 47 </ b> F arranged away from the bottom part also scatter the lubricating oil into the case 2.

  Lubricating oil is supplied to the axial oil passage 335 of the counter shaft 33 from the above-described oil receiver 6 or another oil receiver (not shown). The lubricating oil inside the axial oil passage 335 flows out from the radial oil passage 336 by the action of centrifugal force, and lubricates the needle bearings of the gears 41F to 43F and 46F. Part of the lubricating oil that has flowed out of each needle bearing reaches the first-speed-reverse synchronizer 51 and the second-speed-third synchronizer 52. The first-speed-reverse synchronizer 51 and the second-speed-third synchronizer 52 are lubricated by the lubricating oil that flows out from each needle bearing and the lubricating oil that flies.

  On the other hand, the 4-speed-5-speed synchronizer 53 is lubricated by the lubricating oil dropped from the oil receiver 6 and the flying lubricating oil. The bearings 313, 323, 324, 326, 333, and 334 are supplied with lubricating oil from oil passages that are formed using gaps between structures.

  Here, consider the idling time before the vehicle starts after the engine is started. At the time of idling, the input shaft 31 rotates, but the output shaft 32 and the counter shaft 33 do not rotate. Further, the reverse driven gear 46F, the first speed driven gear 41F, the third speed driven gear 43F, and the second speed driven gear 42F around the counter shaft 33 are driven from the input shaft 31 and idle without transmitting power. . As a result, the lubricating oil at the bottom of the case 2 is scooped up and the inside of the transmission 1 is lubricated.

  Therefore, in the vicinity of the first-speed-reverse synchronizer 51 and the second-speed-third-speed synchronizer 52 that synchronously operate the idle gears 41F to 43F, 46F, a sufficient amount of lubricating oil is scraped up and good lubrication is achieved. Is done. However, the 4-speed-5-speed synchronizer 53 tends to run out of lubricating oil. FIG. 2 is a side view of a 4-speed-5-speed synchronizer 53 that is a specific lubrication target portion of the present invention and its vicinity. FIG. 3 is a cross-sectional view of the 4-speed-5-speed synchronizer 53 and the vicinity thereof as seen from the rear side. In FIG. 2, at the time of idling, the second speed driven gear 42F on the bottom side of the case 2 rotates freely, but the fourth speed driven gear 44F and the output drive gear 47D do not rotate on the same bottom side and do not scoop up the lubricating oil. Accordingly, in the 4-speed-5-speed synchronizer 53, the amount of scattered lubricating oil in the vicinity is smaller than that during power transmission, and both the lubricating oil dripped from the oil receiver 6 and the lubricating oil that is flying down are reduced.

  For this reason, there is a concern that sufficient lubricating oil cannot be supplied to the engagement surface 44P between the synchronizer ring of the synchronizer 53 for the 4th to 5th speed and the gear piece of the 4th speed drive gear 44D in which a speed difference occurs during idling. Similarly, there is a concern that sufficient lubricating oil cannot be supplied to the engagement surface 45P between the synchronizer ring that generates a speed difference during idling and the gear piece of the fifth-speed direct coupling portion 45. Furthermore, if the upshift operation to the 4th and 5th speeds is performed immediately after the vehicle starts running, the friction synchronization operation is performed before the lubricating oil reaches the engagement surfaces 44P and 45P, and wear Increased concerns about burn-in.

  Therefore, in the present embodiment, the present invention is applied to the structure of the oil receiver 6. In FIG. 3, the oil receiver 6 is disposed obliquely above and to the left of the 4-speed-5-speed synchronization device 53 in the internal space of the case 2. Then, the gap between the upper right edge 621 of FIG. 3 of the oil receiver 6 and the inner surface of the case 2 is widened, and the gap between the upper left edge 622 and the inner surface of the case 2 is narrowed. As a result, the oil receiver 6 can efficiently capture the lubricating oil flying as illustrated by the arrow R by the counterclockwise rotation of the input shaft 31. Furthermore, the protrusion 21 extended in the paper surface front-back direction of FIG. 3 is provided in the inner surface of the case 2 above the oil receiver 6. The ridge 21 has a role of capturing a part of the lubricating oil that adheres to the inner surface of the case 2 and flows down and drops it onto the oil receiver 6.

  Next, the detailed structure of the oil receiver 6 will be described. FIG. 4 is a plan view showing a detailed structure of the oil receiver 6 of the gear transmission 1 according to the embodiment. FIG. 5 is a side view of the oil receiver 6 as viewed from the back side of the sheet of FIG. Further, FIG. 6 is a cross-sectional view of the oil receiver 6 viewed from the direction of the arrow XX in FIG. 4, in other words, viewed from the rear side of the transmission 1. Hereinafter, as shown in FIGS. 4 and 6, the right side and the left side are defined. As shown in FIG. 6, the oil receiver 6 is a saucer-like member having a substantially V-shaped cross section including an inclined right side wall 611 and a left side wall 612. Strictly speaking, an upper right edge 621 that is an edge of the right side wall 611 is higher than an upper left edge 622 that is an end edge of the left side wall 612 and is asymmetric on the left and right. The upper right edge 621 and the upper left edge 622 are bent downward to increase the mechanical strength.

  The range shown in FIG. 4 in the interior of the oil receiver 6 is divided into three oil partition portions 641, 642, 643 by two partitioners 631, 632 and a lower end partition 633. The first partition 631 is formed by bending at one place. The first partition 631 slightly enters the center direction from the upper right edge 621 of the right side wall 611, then bends forward, and extends to the front side in parallel with the upper right edge 621. A first oil partition 641 is partitioned by the first partition 631 and the upper right edge 621. A first dripping hole 651 is formed in the right side wall 611 near the bending point of the first partition 631 in the first oil partition portion 641.

  The second partition 632 is formed by bending at two locations. The second partition 632 enters the center direction from a position slightly behind the first partition 631 of the upper right edge 621 and is bent forward in front of the bottom 623 having a substantially V-shaped cross section. An intermediate portion of the second partition 632 is parallel to the first partition 631 in the front-rear direction, bent away from the first partition 631 in the middle, and reaches the upper left edge 622. A second oil partition 642 is partitioned by the second partition 632, the first partition 631, and the upper left edge 622. A second drip hole 652 is formed in the right side wall 611 near the first bending point of the second partition 632 in the second oil partition 642.

  The lower end partition 633 is formed in a straight line. The lower end partition 633 enters the central direction from a position considerably rearward of the second partition 631 of the upper right edge 621, passes through the bottom 623, and reaches the upper left edge 622. A third oil partition portion 643 is partitioned by the lower end partition 633, the second partition 632, the upper right edge 621, and the upper left edge 622. The lower end partition 633 is provided with a supply port 653 for guiding lubricating oil to the rear side. The lower end partition 633 is the rear end of the oil receiver 6. On the other hand, another oil partition part and a supply port (not shown) are formed on the front side of the oil receiver 6 omitted in FIG.

  As shown in FIG. 1, the oil receiver 6 is disposed so that the front side is high and the rear side is low. Therefore, the lubricating oil that has been captured and captured in the oil partition portions 641 to 643 flows from the front side to the rear side in the oil partition portions 641 to 643. Thereby, the lubricating oil in the first oil partition part 641 descends from the first dripping hole 651 and flows out. Similarly, the lubricating oil in the second oil compartment 642 descends from the second dripping hole 652 and flows out. Further, the lubricating oil in the third oil partition part 643 flows out from the supply port 653 to the rear side.

  As shown in FIG. 5, the oil receiver 6 includes three ridges 661 to 663, a damming ridge 67, and a dripping pipe 68. The ridges 661 to 663 are provided in parallel to each other on the outer side surface of the right side wall 611 and extend while inclining in the direction of the axis A1. The inclined lower ends of the protrusions 661 to 663 are located in the vicinity of the first dropping hole 651 and the second dropping hole 652 as shown in FIG. Further, as shown in FIG. 6, the ridges 661 to 663 protrude downward from the right side wall 611, and are thinner toward the lower end.

  The blocking ridge 67 is provided in the vicinity of the inclined lower end of the ridges 661 to 663. The blocking ridge 67 is formed from the upper right edge 621 to the bottom 623 of the right side wall 611 and protrudes from the outer surface. The dripping pipe 68 is provided below the second dripping hole 652 of the right side wall 611 and is located directly above the 4th-5th synchronizer 53. The dripping pipe 68 is a hollow cylindrical member, and the hollow portion communicates with the second dripping hole 652. The dripping pipe 68 is disposed between the inclined lower end of the lower protrusion 663 and the lower end of the blocking protrusion 67.

  The oil receiver 6 described above can be easily manufactured by, for example, integral molding by resin molding. However, the material of the oil receiver 6 is not limited to resin, and the manufacturing method is not limited to resin molding.

  Next, in the gear transmission 1 of the embodiment, the operation and effect of lubricating the 4th-5th synchronizer 53 will be described in comparison with the prior art. In the embodiment shown in FIG. 5, since the 4th speed driven gear 44F and the output drive gear 47D do not rotate during idling, the lubricating oil does not fly so much behind the protrusions 661 to 663. However, since the reverse driven gear 46F, the first-speed driven gear 41F, the third-speed driven gear 43F, and the second-speed driven gear 42F are idle even during idling, the lubricating oil comes to the front side of the protrusions 661 to 663. Each of the protrusions 661 to 663 captures the incoming lubricating oil by its viscosity and guides it along the inclination as indicated by arrows S1 to S3. As shown by arrow S <b> 4, the weiring ridge 67 dams the lubricating oil guided by each of the ridges 661 to 663 and guides it to the outer peripheral surface of the dripping pipe 68. Further, as shown by the arrow S5, the blocking protrusion 67 is not dripped out of the lubricating oil that is captured by the first oil partition portion 641 and descends and flows out of the first dripping hole 651. The transmitted amount is guided to the outer peripheral surface of the dropping pipe 68.

  The inner peripheral surface of the dripping pipe 68 guides the lubricating oil that is captured by the second oil partitioning portion 642 and descends from the second dripping hole 652, and is directed toward the 4-speed-5-speed synchronizer 53 as an oil droplet at the lower end. To drop (indicated by arrow S6). Furthermore, the outer peripheral surface of the dropping pipe 68 guides the lubricating oil guided by the protrusions 661 to 663 and the weiring protrusion 67 and accumulates at the lower end thereof to form oil droplets in the 4-speed-5-speed synchronizer 53. It is dropped (indicated by arrow S7). That is, the dripping pipe 68 also serves as the dripping member of the present invention. Thereby, the 4-speed-5 speed synchronizer 53 is lubricated satisfactorily.

  In addition, since the 4th-speed driven gear 44F and the output drive gear 47D rotate when the vehicle travels, the lubricating oil also comes to the front side of the protrusions 661 to 663. In addition, the amount of lubricating oil captured by the first oil compartment 641 and the second oil compartment 642 of the oil receiver 6 is increased as in the prior art. Therefore, the 4-speed-5-speed synchronizer 53 is lubricated better.

  On the other hand, the oil receiver 9 according to the prior art tends to run out of lubricating oil supplied to the 4-speed-5-speed synchronizer 53 during idling. FIG. 7 is a side view of a conventional oil receiver 9, and FIG. 8 is a cross-sectional view of the conventional oil receiver 9. As shown in FIG. The internal structure of the prior art oil receiver 9 is the same as the embodiment shown in FIG. However, the oil receiver 9 of the prior art does not consider the effective use of the lubricating oil flying on the outer surface, and does not have the protrusions 661 to 663, the blocking protrusion 67, and the dripping pipe 68.

  In the prior art shown in FIG. 7, the lubricating oil flying mainly to the front side of the outer side surface of the right side wall 611 at the time of idling is accumulated at the bottom portion 623 along the outer side surface as illustrated by the arrow Z1. , Easy to become large oil droplets. For this reason, the oil droplet is likely to drop before reaching the vicinity of the second dropping hole 652 (indicated by arrow Z2). In addition, since there are no blocking protrusions 67 and no dropping pipe 68, the lubricating oil often passes through the second dropping hole 652 to the rear side (indicated by arrow Z3). Furthermore, a part of the lubricating oil descending the first dropping hole 651 and the second dropping hole 652 escapes to the rear side through the right side wall 611 without being dripped (indicated by arrows Z4 and Z5).

  On the other hand, in the gear transmission 1 according to the embodiment, the ridges 661 to 663, the damming ridges 67, and the dripping pipe 68 are used, and the lubricating oil flying to the outer surface of the oil receiver 6 is transmitted to the fourth speed to the fifth speed. Is supplied to the synchronizer 53. In addition, the protrusions 661 to 663 guide the lubricating oil to move from a region where the amount of scattered lubricating oil is large on the front side of the transmission 1. Here, since there are a plurality of protrusions 661 to 663 and the lubricating oil flying is divided and captured, it is difficult to form large oil droplets compared to the embodiment, and it is difficult to fall before reaching the dropping pipe 68 and accumulating. . Further, the blocking ridge 67 and the drip pipe 68 suppress the escape of the lubricating oil guided by the ridges 661 to 663 and the lubricating oil captured inside the oil receiver 6 to the rear side along the right side wall 611. . Therefore, due to these comprehensive effects, even in the 4-speed-5-speed synchronizer 53 in which the amount of scattering of the lubricating oil during idling is smaller than that during power transmission, a sufficient amount of lubricating oil is supplied, Good lubrication can be reliably performed.

  Furthermore, since the dripping pipe 68 also serves as a dripping member, the complexity of the shape of the oil receiver 6 can be suppressed. Thereby, the integral molding process by resin molding becomes possible, and the increase in manufacturing cost can be suppressed.

  In the present embodiment, the 4-speed-5-speed synchronization device 53 is the specific lubrication target site, but the present invention may be applied to other sites as the specific lubrication target site. In addition, the present invention can be variously applied and modified.

1: Gear transmission 2: Case 31: Input shaft 32: Output shaft 33: Counter shaft 41D to 44D: 1st to 4th drive gear 41F to 44F: 1st to 4th driven gear 45: 5th direct connection 46D: Reverse drive gear 46F: Reverse driven gear 47D: Output drive gear 47F: Output driven gear 53: Synchronizer for 4th-5th gear (specific lubrication target part)
6: Oil separator 611: Right side wall 612: Left side wall 621: Upper right edge 622: Upper left edge 623: Bottom 631: First partition 632: Second partition 633: Lower end partition 641, 642, 643: First to third oil partitions Portion 651: First dropping hole 652: Second dropping hole 653: Supply port 661-663: Projection 67: Damping projection 68: Dropping pipe (dropping member)
9: Conventional oil receiver

Claims (4)

A case filled with lubricating oil;
A shaft member that is supported by the case and transmits power;
A plurality of sets of gear pairs that are provided on the shaft member and selectively meshed with each other to achieve a predetermined gear ratio, at least a part of which is configured to scoop up the lubricating oil;
A gear transmission comprising: a saucer-shaped oil receiver that is disposed in an upper portion of the internal space of the case and captures the lubricant oil that is scooped up and flying to the lubrication target site;
The oil receiver is
A plurality of ridges provided in parallel to each other on the outer surface thereof, extending while inclining in the axial length direction of the shaft member, capturing the lubricating oil by its viscosity and guiding it along the inclination;
A gear transmission comprising: a dropping member that is erected downward from a vicinity of the inclined lower ends of the plurality of protrusions toward a specific lubrication target portion and that drops the lubricating oil.   2. The oil receiver further includes a damming ridge provided near the inclined lower end of the plurality of ridges and damming the lubricating oil guided by the plurality of ridges to guide the dropping member. The gear transmission described in 1.   The oil receiver has a plurality of oil compartments partitioned by a partition, and any of the oil compartments has a hollow dropping pipe that drops lubricating oil toward the specific lubrication target site, The gear transmission according to claim 1, which also serves as a dropping member.   The gear transmission according to any one of claims 1 to 3, wherein the specific lubrication target portion is a synchronization device that synchronously operates a gear that does not rotate during idling but rotates during power transmission.

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