JP2017025985A - Lubrication structure of transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress scattering of lubricant to prevent seizure of a bearing.SOLUTION: A lubrication structure of a transmission 1 includes transmission gears 15, 16 on a shaft 10 having a lubricant oil passage capable of discharging lubricant to a radial direction, where, on the outer periphery of the shaft 10, an inner ring 32 is provided in an immovable manner; an outer ring 31 is provided in an immovable manner, in a transmission case; between the inner ring 32 and the outer ring 31, a bearing part 30 having a roller 33 is interposed in a slidable manner, an annular thrust washer 40 inserted into the shaft 10, and interposed between the bearing part 30 and the transmission gear 15; and on the side surface of the thrust washer 40, an annular projection part 44 projecting toward the roller 33 in an axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission lubrication structure, and more particularly to a thrust washer disposed between a transmission gear and a bearing.

  Conventionally, in a transmission, lubricating oil is supplied to each part in a transmission case in order to reduce friction generated in a plurality of transmission gear trains and bearings. As this type of lubricating structure, for example, the lubricating oil is discharged in a radial direction from a lubricating oil passage formed inside the main shaft, and the lubricating oil is adjacent to a radial oil groove formed on a side surface of the thrust washer. A technique for supplying a bearing is known (for example, see Patent Document 1).

Japanese Utility Model Publication No. 60-110760

  By the way, since the thrust washer rotates integrally with the main shaft, centrifugal force acts on the lubricating oil supplied from the radial oil groove of the main shaft to the bearing. For this reason, if the lubricating oil splashes outward from the radial oil groove of the thrust washer under the influence of centrifugal force, a sufficient amount of lubricating oil cannot be supplied to the bearing, and in particular, the inner ring flange of the bearing and the roller There is a problem of causing oil film breakage on the contact surface and causing seizure of these parts.

  An object of the disclosed technique is to effectively prevent the seizure of the lubricating oil and prevent the bearing from seizing.

  The disclosed technique is a lubricating structure for a transmission in which a transmission gear is provided on a shaft having a lubricating oil passage capable of discharging lubricating oil in a radial direction, and an inner ring and a transmission that are provided on the outer periphery of the shaft so as not to rotate. A bearing part having an outer ring that is non-rotatably provided in the machine case, and a roller that is slidably interposed between the inner ring and the outer ring, and is inserted through the shaft, and the bearing part and the speed change And an annular thrust washer interposed between the gear and an annular protrusion that protrudes in the axial direction toward the roller on the side surface of the thrust washer.

  The annular protrusion may extend between the inner ring and the outer ring, and the protruding end may be adjacent to the side surface of the roller.

  A discharge port of the lubricating oil passage is provided on the outer peripheral surface of the shaft facing the transmission gear, and a shaft oil groove extending in the axial direction from the discharge port toward the bearing portion is recessed in the outer peripheral surface of the shaft. The thrust washer includes a through oil groove that passes through the inner ring portion in the axial direction, and a radial direction that extends in a radial direction from the downstream end of the through oil groove toward the shelf portion on a side surface facing the bearing portion. The oil groove may be recessed.

  An annular oil groove may be provided on a side surface of the thrust washer facing the transmission gear, with the side surface notched obliquely toward the inner ring portion.

  An annular inclined surface portion may be provided on a side surface of the thrust washer facing the bearing portion, with the side surface notched obliquely toward the outer ring portion.

  According to the disclosed technology, it is possible to effectively prevent scattering of the lubricating oil and prevent the bearing from being seized.

It is typical sectional drawing which shows a part of transmission which concerns on one Embodiment of this invention. 1 is a schematic perspective view showing a part of a main shaft of a transmission according to an embodiment of the present invention. It is the typical front view which looked at the thrust washer concerning one embodiment of the present invention from the cylindrical roller bearing side. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a figure explaining the flow of the lubricating oil in the lubricating structure of the transmission which concerns on one Embodiment of this invention.

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

  As shown in FIG. 1, the main shaft 10 of the transmission 1 is rotatably supported by the transmission case 2 via a cylindrical roller bearing 30. A plurality of transmission gears 15 and 16 are rotatably supported on the main shaft 10 via needle bearings 3 and 4.

  The main shaft 10 has an axial oil passage 11 extending in the axial direction for flowing the lubricating oil, and extending radially from the axial oil passage 11 toward the outer peripheral surface of the main shaft 10 so as to surround the lubricating oil. Radial oil passages 12 and 13 for discharging from the opening 12A (see FIG. 2) of the surface are formed. These radial oil passages 12 and 13 are provided, for example, at positions facing the respective inner peripheral surfaces (needle bearings 3 and 4) of the transmission gears 15 and 16.

  A shaft outer peripheral oil groove 14 (see FIGS. 1 and 2) extending in the axial direction from the opening 12A (see FIG. 2) toward a thrust washer 40, which will be described in detail later, is formed on the outer peripheral surface of the main shaft 10.

  The synchromesh mechanism 20 has a synchromesh 21 whose inner peripheral teeth are spline-fitted with the spline teeth 10A (see FIG. 2) of the main shaft 10, and is always meshed with the outer peripheral teeth of the synchromesh hub 21 and a shift fork (not shown). , And a synchronizer ring 23 provided between the sync hub 21 and the dog gear 15A to apply a synchronous load.

  The cylindrical roller bearing 30 includes an outer ring portion 31, an inner ring portion 32, and a cylindrical roller 33 that is slidably sandwiched between the outer ring portion 31 and the inner ring portion 32.

  The outer ring portion 31 is provided with a pair of flange portions 31A and 31B that protrude radially inward at both axial ends of the inner peripheral surface thereof. The outer ring portion 31 is press-fitted and fixed in a mounting hole of the transmission case 2. The inner ring portion 32 includes two parts, an annular first collar portion 32A and an annular second collar portion 32B having a substantially L-shaped cross section. The inner ring portion 32 is fitted to the outer peripheral portion 10B (see FIG. 2) of the main shaft 10 at the inner periphery thereof.

  The thrust washer 40 is formed in a substantially annular shape when viewed from the front, and is slidably inserted into the main shaft 10 and interposed between the transmission gear 15 and the cylindrical roller bearing 30. In addition, since the thrust washer 50 between the transmission gear 16 and the cylindrical roller bearing 30 is configured in the same manner as the thrust washer 40, detailed description of the thrust washer 50 will be omitted below.

  As shown in FIGS. 3 and 4, the thrust washer 40 has an annular shelf (annular protrusion) 44 that protrudes at a predetermined height in the axial direction from the first side surface portion 40A on the cylindrical roller bearing 30 side. Projected. The shelf portion 44 extends between the outer ring portion 31 and the inner ring portion 32 of the cylindrical roller bearing 30, and a small clearance is secured between the protruding end and the side surface of the cylindrical roller 33. ing.

  In the first side surface portion 40A of the thrust washer 40, a plurality of (four in the illustrated example) radial oil grooves 45 extending in the radial direction from the inner ring portion 41 toward the shelf portion 44 are recessed. Further, the first side surface portion 40A is provided with an annular inclined surface portion 48 formed by obliquely cutting the outer ring portion 42 toward the first side surface portion 40A.

  The inner ring portion 41 of the thrust washer 40 has a plurality of recesses (4 in the illustrated example) that are recessed radially outward at a predetermined depth and that penetrate the thrust washer 40 in the axial direction and communicate with the radial oil groove 45. The main through-groove 46 is recessed. The second side surface portion 40B of the thrust washer 40 on the transmission gear 15 side has an annular oil groove 47 (see FIG. 4) formed by obliquely cutting the second side surface portion 40B toward the inner ring portion 41. Is provided.

  Next, based on FIG. 5, the effect of the lubricating structure of the transmission of this embodiment is demonstrated.

  As indicated by a broken line arrow X1 in FIG. 5, the lubricating oil flows through the axial oil passage 11 and the radial oil passage 12 of the main shaft 10 and is discharged from the opening 12A (see FIG. 2). It flows in the groove 14 toward the thrust washer 40.

  The lubricating oil that has reached the downstream end of the shaft outer circumferential groove 14 circulates in the annular oil groove 47 and reaches the radial oil groove 45 through the through oil passage 46 as indicated by a broken arrow X2. The lubricating oil that has reached the radial oil groove 45 flows radially outward by centrifugal force, hits the shelf 44, and is guided along the inner peripheral surface of the shelf 44, while the outer ring portion of the cylindrical roller bearing 30. 31 is guided between the inner ring portion 32 and the inner ring portion 32.

That is, the lubricating oil supplied from the radial oil groove 45 is surely received and guided by the shelf portion 44 without splashing radially outward, so that the lubricating oil is effectively introduced toward the cylindrical roller bearing 30. It is configured to be. Therefore, according to the lubrication structure of the present embodiment, effectively it is possible to secure the amount of lubricating oil supplied to the cylindrical roller bearing 30, the first flange portion 32A and the cylindrical roller 33 particularly prone to air image sticking Oil film breakage between the two can be reliably prevented.

Further, as indicated by a broken line arrow X3 in FIG. 5, part of the lubricating oil scraped up into the transmission case 2 by the transmission gear 15 or the like falls to the thrust washer 40 and is sunk by the annular inclined surface portion 48. 44 is effectively collected on the outer peripheral surface. Further, the lubricating oil is caused to flow along the outer peripheral surface of the shelf portion 44 and is effectively introduced between the outer ring portion 31 and the inner ring portion 32 of the cylindrical roller bearing 30. Therefore, according to the lubrication structure of the present embodiment, effectively it becomes possible to increase the amount of lubricating oil supplied to the cylindrical roller bearing 30, a-out image sticking of the cylindrical roller bearing 30 can be reliably prevented .

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, the shaft is not limited to the main shaft 10 and can be widely applied to other shafts in which a lubricating oil passage is formed, such as a counter shaft. Further, the bearing is not limited to the cylindrical roller bearing 30 and can be widely applied to other bearings such as a ball bearing.

DESCRIPTION OF SYMBOLS 1 Transmission 2 Transmission case 3, 4 Needle bearing 10 Main shaft 11 Axial oil path 12, 13 Radial oil path 14 Shaft outer peripheral groove 15, 16 Transmission gear 20 Synchromesh mechanism 21 Synchro hub 22 Synchro sleeve 23 Synchronizer ring 30 Cylindrical roller bearing 31 Outer ring part 31A, B collar part 32 inner ring part 32A first collar part 32B second collar part 33 cylindrical roller 40 thrust washer 41 inner ring part 42 outer ring part 44 shelf part (annular projection part)
45 radial oil groove 46 through oil groove 47 annular oil groove 48 annular inclined surface portion

Claims (5)

A transmission lubrication structure in which a transmission gear is provided on a shaft having a lubricating oil passage capable of discharging lubricating oil in a radial direction,
An inner ring provided non-rotatably on the outer periphery of the shaft, an outer ring provided non-rotatably on the transmission case, and a bearing portion having a roller slidably interposed between the inner ring and the outer ring;
An annular thrust washer that is inserted between the shaft and interposed between the bearing portion and the transmission gear,
A lubrication structure for a transmission, wherein an annular protrusion that protrudes in an axial direction toward the roller is provided on a side surface of the thrust washer. The lubricating structure for a transmission according to claim 1, wherein the annular protrusion extends between the inner ring and the outer ring, and a protruding end thereof is adjacent to a side surface of the roller. A discharge port of the lubricating oil passage is provided on the outer peripheral surface of the shaft facing the transmission gear, and a shaft oil groove extending in the axial direction from the discharge port toward the bearing portion is recessed in the outer peripheral surface of the shaft. The thrust washer includes a through oil groove that passes through the inner ring portion in the axial direction, and a radial direction that extends in a radial direction from the downstream end of the through oil groove toward the shelf portion on a side surface facing the bearing portion. The lubrication structure for a transmission according to claim 1 or 2, wherein an oil groove is provided in a recessed manner. The lubricating structure for a transmission according to claim 3, wherein an annular oil groove is provided on a side surface of the thrust washer facing the transmission gear, the side surface being obliquely cut toward the inner ring portion. The lubrication of the transmission according to any one of claims 1 to 4, wherein an annular inclined surface portion is provided on a side surface of the thrust washer facing the bearing portion, the side surface being obliquely cut toward the outer ring portion. Construction.

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