JP6627523B2 - Transmission lubrication structure - Google Patents

Description

  The present invention relates to a lubrication structure for a transmission.

  Generally, in a transmission, lubricating oil is supplied to each transmission element and each sliding element in a transmission case in order to reduce friction generated in transmission gears, bearings, and the like.

  As this type of lubrication structure, for example, in Patent Documents 1 and 2, a plurality of radial oil passages and an axial oil passage communicating with these radial oil passages are formed inside a main shaft. By lubricating oil taken in one radial oil passage from the outer peripheral surface is discharged from the axial oil passage through the other radial oil passage, each sliding element etc. arranged around the main shaft is lubricated. A structure adapted to do so is disclosed.

JP 2008-144803 A Japanese Utility Model Publication No. 60-110760

  By the way, with the rotation of the main shaft, a centrifugal force acts on the lubricating oil flowing through the radial oil passage in the main shaft. For this reason, unless a mechanism (for example, an oil catcher, etc.) is provided on the outer peripheral surface of the main shaft to allow the lubricating oil to be actively taken into the radial oil passage, lubrication from the radial oil passage to the axial oil passage is performed. It becomes difficult to introduce oil, and there is a possibility that sufficient lubricating oil cannot be supplied to the sliding element and the speed change element.

  The disclosed technology aims to effectively increase the amount of lubricating oil introduced from a radial oil passage in a shaft to an axial oil passage.

  The disclosed technology includes a shaft rotatably supported by a transmission case, a radial oil passage that opens in the outer periphery of the shaft, and extends radially in the shaft toward the axis. An axial oil passage that extends in the shaft direction in the axial direction and communicates with the radial oil passage, and is provided so as to be integrally rotatable with the shaft at an outer peripheral portion of the shaft where the radial oil passage opens. An annular member including a through oil passage communicating with the radial oil passage; and an annular member provided on an outer periphery of the annular member so as to be integrally rotatable with the annular member. An impeller member that includes an introduction oil passage connected to the through oil passage, and that sends lubricating oil from the introduction oil passage to the through oil passage by a pumping action by rotation.

  A flat first flat portion is provided on at least a part of an outer peripheral portion of the shaft where the radial oil passage opens, and a flat first flat portion that is in surface contact with the first flat portion on an inner peripheral side of the annular member. Two flat portions may be provided.

  A third flat portion having a planar shape parallel to the second flat portion is provided on an outer peripheral side of the annular member, and the through oil passage is formed to penetrate from the third flat portion toward the second flat portion. An impeller member may be provided on the third flat portion.

  The introduction oil passage may be formed in a curved shape.

  According to the disclosed technology, the amount of lubricating oil introduced from the radial oil passage in the shaft to the axial oil passage can be effectively increased.

It is a typical sectional view showing a part of transmission concerning this embodiment. It is a typical perspective view showing the lubrication structure of the transmission concerning this embodiment. It is a typical exploded perspective view showing the lubrication structure of the transmission concerning this embodiment. FIG. 3 is a sectional view taken along line AA of FIG. 2. It is a typical sectional view showing the lubrication structure of the transmission concerning other embodiments.

  Hereinafter, a lubrication structure for a transmission according to an embodiment of the present invention will be described with reference to the accompanying drawings. The same components are denoted by the same reference numerals, and have the same names and functions. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, a main shaft 10 rotatably supported via a cylindrical roller bearing (not shown) is disposed in the transmission case 2. A plurality of transmission gears 13 and 14 are rotatably supported on the main shaft 10 via needle bearings 11 and 12 so as to be relatively rotatable. The main shaft 10 is provided with a synchronizing mechanism 20 for selectively synchronizing (gear-in) the transmission gears 13 and 14 with the main shaft 10.

  The synchro mechanism 20 includes a synchro hub 21 splined to the main shaft 10, a synchro sleeve 22 having inner peripheral teeth meshing with outer peripheral teeth of the synchro hub 21, and dog gears 23 splined to the transmission gears 13 and 14. , 24 and synchronizer rings 25, 26 disposed between the synchro hub 21 and the dog gears 23, 24.

  When the synchro sleeve 22 is shifted by a shift fork (not shown) and pushes the synchronizer rings 25 and 26, a synchronous load is generated. When the gear 22 further moves and meshes with the dog gears 23 and 24, the transmission gears 13 and 14 are selectively synchronously coupled (gear-in) with the main shaft 10.

  Inside the main shaft 10, first and second radial oil passages 30A, B extending radially from the outer periphery in front of the transmission gear 13 toward the axis, and first and second radial oil passages. An axial oil passage 31 extending in the axial direction from the junction of the oil passages 30A and 30B, and third and fourth radially extending passages from the axial oil passage 31 toward the respective needle bearings 11 and 12. Radial oil passages 33A and 33B are formed.

  Flat portions (first flat portions) 10A, B formed by cutting out a part of the outer circumferential portion in a plane are formed on the outer peripheral portion of the main shaft 10 where the first and second radial oil passages 30A, 30B are opened. Is provided. A lubricating oil introduction mechanism 40 which functions as an oil catcher for introducing lubricating oil into the radial oil passages 30A, B is provided on the outer peripheral portion of the main shaft 10 including the flat portions 10A, 10B.

  Next, a detailed configuration of the lubricating oil introduction mechanism 40 will be described with reference to FIGS.

  The lubricating oil introduction mechanism 40 includes an annular member 41 fitted on the outer periphery of the main shaft 10, and a pair of impeller members 47 </ b> A and 47 B fixed on the outer periphery of the annular member 41.

  The annular member 41 includes a pair of linear portions 42A and 42B (see FIGS. 3 and 4) facing each other when viewed in the axial direction, and a pair of arc-shaped portions 43A and 43B (see FIGS. 3 and 4) connecting the linear portions 42A and 42B. 4). Further, in each of the linear portions 42A, B, there are formed through oil passages 44A, 44B communicating with the first and second radial oil passages 30A, 30B, respectively. The inner peripheral sides of the linear portions 42A and 42B are formed as planar flat portions (second flat portions) 45A and 45B. The flat portions 45A and 45B function as rotation stoppers that make the annular member 41 relatively unrotatable with respect to the main shaft 10 by making surface contact with the flat portions 10A and 10B of the main shaft 10. The outer peripheral sides of the linear portions 42A, B are formed as planar flat portions (third flat portions) 46A, B facing the inner peripheral flat portions 45A, B in parallel. Impeller members 47A and 47B are fixed to the flat portions 46A and 46B.

  The impeller members 47A and 47B are formed in a hollow shape having curved introduction oil passages 48A and 48B. More specifically, each of the introduction oil passages 48A and 48B is formed such that one end thereof opens in the rotation direction R of the main shaft 10 and the other end thereof communicates with each of the through oil passages 44A and 44B of the annular member 41. Have been. That is, when the impeller members 47A, B fixed to the annular member 41 rotate integrally with the rotation of the main shaft 10, the lubricating oil is introduced by the pumping action of the rotation to introduce the oil passages 48A, B → the through oil passages 44A, B → diameter. The lubricant is fed in the order of the directional oil passages 30A and 30B, so that the amount of lubricating oil introduced into the axial oil passage 31 is effectively increased.

  As described above in detail, according to the lubricating structure of the present embodiment, the radial oil passages 30A and 30B are provided in the radial oil passages 30A and 30B by the pumping action of rotation. A lubricating oil introduction mechanism 40 that functions as an oil catcher for feeding lubricating oil is provided. That is, since the lubricating oil is positively fed to the radial oil passages 30A and 30B by the lubricating oil introduction mechanism 40, the amount of lubricating oil introduced from the radial oil passages 30A and B to the axial oil passage 31 is increased. Can be effectively increased.

  Further, according to the present embodiment, the linear members 42A, B are provided on the annular member 41, and the impeller members 47A, B are disposed on the flat portions 46A, B on the outer peripheral side of the linear members 42A, B. Compared to a structure in which the annular member is formed in a cylindrical shape and the impeller member is arranged on the outer cylinder surface, the distance between the impeller members 47A and 47B and the axial oil passage 31 and the length of the radial oil passages 30A and 30B are smaller. It is formed short. This makes it possible to effectively reduce the effect of the centrifugal force acting on the lubricating oil in the radial oil passages 30A and 30B due to the rotation of the main shaft 10, and to reduce the axial oil from the radial oil passages 30A and B. The amount of lubricating oil introduced into the passage 31 can be reliably increased.

  Further, according to the present embodiment, the inner peripheral sides of the linear portions 42A, B of the annular member 41 are flat portions 45A, B, and the flat portions 45A, B are in surface contact with the flat portions 10A, B of the main shaft 10. By functioning as a detent, a reduction in the number of parts and an improvement in assemblability can be reliably achieved as compared with a structure in which a fixing key or the like is provided separately.

  Note that the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present invention.

  For example, the annular member 41 for fixing the impeller members 47A, B does not necessarily have to have the linear portions 42A, B, and the annular member 41 may be formed in an annular shape as shown in FIG. Also in this case, the amount of lubricating oil introduced from the radial oil passages 30A and 30B to the axial oil passage 31 can be effectively increased by the pumping action of the rotation.

  Further, the number of the linear portions 42A, B and the number of the impeller members 47A, B of the annular member 41 are not limited to two in the illustrated example, but may be one or three or more.

  Further, the parts where the third and fourth radial oil passages 33A and 33B supply the lubricating oil are not limited to the needle bearings 11 and 12, and may be configured to supply the lubricating oil to other sliding elements and speed change elements. Good.

2 Transmission case 10 Main shaft 10A, B Flat part (first flat part)
11, 12 Needle bearing 13, 14 Transmission gear 30A First radial oil passage 30B Second radial oil passage 31 Axial oil passage 33A Third radial oil passage 33B Fourth radial oil passage 40 Lubricating oil introduction mechanism 41 Annular Member 42A, B Linear portion 44A, B Penetrating oil passage 45A, B Flat portion (second flat portion)
46A, B flat part (third flat part)
47A, B Impeller member 48A, B Introducing oil passage

Claims (2)

A shaft rotatably supported by the transmission case, a radial oil passage extending radially inside the shaft, penetrating the shaft center of the shaft, and having both ends open to the outer periphery of the shaft ; An axial oil passage extending axially in the shaft and communicating with the radial oil passage, a lubrication structure for a transmission,
A pair of first flat portions formed by cutting a part of the outer peripheral portion into a planar shape is provided on an outer peripheral portion of the shaft where the radial oil passage opens,
Furthermore, a pair of planar second flat portions that are in surface contact with the first flat portion are provided on the inner peripheral side, and a pair of third flat portions parallel to the second flat portion are formed on the outer peripheral side, An annular member formed with a through oil passage communicating with the radial oil passage from the second flat portion toward the third flat portion ;
The third flat portion of the annular member includes an introduction oil passage that is provided so as to be integrally rotatable with the annular member, one end of which is open in the rotation direction of the shaft, and the other end of which is connected to the through oil passage. And a pair of impeller members for feeding lubricating oil from the introduction oil passage to the through oil passage by a pumping action by rotation. The transmission lubrication structure according to claim 1, wherein the introduction oil passage is formed in a curved shape.

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