WO2017014077A1

WO2017014077A1 - Transmission and lubricating structure for transmission

Info

Publication number: WO2017014077A1
Application number: PCT/JP2016/070315
Authority: WO
Inventors: 卓弘鶴岡
Original assignee: いすゞ自動車株式会社
Priority date: 2015-07-21
Filing date: 2016-07-08
Publication date: 2017-01-26
Also published as: JP2017025985A; JP6610051B2; CN107850204A; CN107850204B

Abstract

The present invention pertains to a lubricating structure for a transmission 1 in which speed-changing gears 15, 16 are provided to a shaft 10 having a lubricating oil channel capable of discharging lubricating oil in a radial direction. The lubricating structure is provided with: a bearing section 30 having an inner ring 32 non-rotatably provided to the outer periphery of the shaft 10, an outer ring 31 non-rotatably provided to a transmission case, and a roller 33 slideably interposed between the inner ring 32 and the outer ring 31; and an annular thrust washer 40 inserted through the shaft 10 and interposed between the bearing section 30 and the speed-changing gear 15, the side surface of the thrust washer 40 being provided with an annular protrusion 44 that protrudes in the axial direction toward the roller 33.

Description

Transmission lubrication structure and transmission

The present invention relates to a transmission lubrication structure and a transmission, 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 the 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 National Utility Model Publication No. 60-110760

Incidentally, since the thrust washer rotates integrally with the main shaft, a centrifugal force acts on the lubricating oil supplied to the bearing from the radial oil groove of the main shaft. 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.

The disclosed technology aims to prevent the seizure of the bearing by effectively suppressing the scattering of the lubricating oil.

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.

The side surface of the thrust washer that faces the bearing portion may be provided with an annular inclined surface portion in which the side surface is cut obliquely toward the outer ring portion.

Further, the disclosed technology is a transmission, which is attached to a transmission case, a shaft having a lubricating oil passage for discharging lubricating oil in a radial direction, a transmission gear provided on the shaft, and an outer periphery of the shaft. An inner ring, an outer ring attached to the transmission case, a bearing portion having a roller that slides between the inner ring and the outer ring, and a shaft that is inserted between the bearing portion and the transmission gear. The thrust washer includes an annular protrusion that protrudes in the axial direction from the side surface toward the roller.

According to the disclosed technique, it is possible to effectively prevent the lubricant from being scattered and prevent the bearing from seizing.

FIG. 1 is a schematic cross-sectional view showing a part of a transmission according to an embodiment of the present invention. FIG. 2 is a schematic perspective view showing a part of the main shaft of the transmission according to the embodiment of the present invention. FIG. 3 is a schematic front view of a thrust washer according to an embodiment of the present invention viewed from the cylindrical roller bearing side. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a view for explaining the flow of the lubricating oil in the lubricating structure of the transmission according to the embodiment of the present 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.

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

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 synchro sleeve 22 that can be selectively engaged with the dog gear 15A of the transmission gear 15 and a synchronizer ring 23 that is provided between the sync hub 21 and the dog gear 15A and applies 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 projecting 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, the function and effect of the lubricating structure of the transmission according to this embodiment will be described with reference to FIG.

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, it is possible to effectively ensure the amount of lubricating oil supplied to the cylindrical roller bearing 30, and in particular, the first collar portion 32A and the cylindrical roller 33 that are likely to be seized. It is possible to reliably prevent the oil film from being cut.

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, it is possible to effectively increase the supply amount of the lubricating oil to the cylindrical roller bearing 30, and it is possible to reliably prevent seizure of the cylindrical roller bearing 30.

It should be noted 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 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.

This application is based on a Japanese patent application (Japanese Patent Application No. 2015-143714) filed on July 21, 2015, the contents of which are incorporated herein by reference.

The lubrication structure and transmission for a transmission according to the present disclosure have the effect of effectively suppressing splashing of lubricating oil and preventing seizure of bearings, and provide a highly reliable transmission. This is useful in that it becomes possible.

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

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.
A transmission,
A transmission case;
A shaft having a lubricating oil passage for discharging lubricating oil in a radial direction;
A transmission gear provided on the shaft;
An inner ring attached to the outer periphery of the shaft, an outer ring attached to the transmission case, and a bearing portion having a roller that slides between the inner ring and the outer ring;
An annular thrust washer inserted between the shaft and provided between the bearing and the transmission gear;
The transmission, wherein the thrust washer has an annular protrusion that protrudes in an axial direction from a side surface toward the roller.