JP2010054025A - Lubricating structure for transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent shortage of lubricating oil supplied to a lubricating oil passage arranged in a transmission even when a sufficient amount of lubricating oil is not scattered by transmission gears in a casing owing to low rotation speed of an engine. <P>SOLUTION: A lubricating structure for a transmission has: an axial hole 12b opened on one end of an input shaft 12 while being coaxially formed on the input shaft 12 supported in a casing 10; the lubricating oil passage 12a organized by the axial hole 12b and a radial hole 12c for interconnection with an outer peripheral surface in a position arranged on transmission gears 23a-26a while being radially formed on the input shaft 12; and a groove-shaped oil receiver 31 fixed on the casing 10 and inclined so as to cause an one end side of the input shaft 12 to be set as a lower side. A projected ridge 10d to an oil receiver 31 side in a position as an upper side of the oil receiver 31 is formed on an upper wall of the casing 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lubrication structure for a transmission that lubricates each part of the transmission.

  Conventionally, as a lubricating structure of a transmission, for example, there is a technique disclosed in Patent Document 1. A transmission to which this lubrication structure is applied includes an input shaft and an output shaft that are coaxially disposed in a casing that accommodates lubricating oil at the bottom, and a counter shaft that is disposed below these shafts in parallel with both shafts. And a plurality of pairs of transmission gears that are provided in pairs with the input shaft, the output shaft, and the counter shaft corresponding to each gear position, and one end portion of the input shaft that is formed coaxially with the input shaft. An oil passage in the shaft opened in the shaft, a branch oil hole formed in the input shaft in a radial direction and branched from the oil passage in the shaft and opened in a bearing portion of a transmission gear provided in the input shaft; And an eaves-like oil receiver that extends in the axial direction with the opening side of the oil passage in the shaft inclined downward.

In this transmission, the lubricating oil contained in the bottom of the casing is lifted up by a transmission gear provided on the countershaft and scattered in the casing to lubricate each part of the transmission, and a part of the scattered lubricating oil is Although it adheres to the inner wall of the casing and flows down along the inner wall, the remaining part is received by the oil receiver and supplied from the oil passage in the shaft to the bearing portion of the transmission gear through the branch oil hole. And lubricate the vicinity.
Japanese Patent Laid-Open No. 10-103424

  In the transmission as described above, when each shaft rotates at a high speed, a large amount of lubricating oil is scattered in the casing, so that a sufficient amount of lubricating oil can be received by the oil receiver. The bearing and its neighboring parts can be adequately lubricated, but when the rotational speed of each shaft is low, the amount of lubricating oil scattered in the casing is small, and the scattered lubricating oil flows down while adhering to the inner wall of the casing. Since the oil receiver does not enter the oil receiver, the oil receiver cannot receive a sufficient amount of lubricating oil, and the bearing portion of the transmission gear and the vicinity thereof may be insufficiently lubricated. The present invention aims to solve such problems.

  For this reason, the transmission lubrication structure according to the present invention has a casing for containing lubricating oil at the bottom, a plurality of transmission shafts supported in parallel in the casing, and the transmission shafts provided on the transmission shafts to select these transmission shafts. A plurality of pairs of transmission gears connected to each other, an axial hole formed coaxially with the transmission shaft and opened at one end of the transmission shaft, and formed with a radial direction on the transmission shaft and formed between the axial hole and the transmission shaft. Lubricating oil passage composed of a radial hole communicating with the outer peripheral surface, and a groove shape that extends and is fixed in the casing in the axial direction of the transmission shaft and is inclined so that the one end side of the transmission shaft is on the lower side. The oil at the bottom of the casing is lifted up by a plurality of pairs of transmission gears and scattered in the casing, and the scattered lubricating oil is received by the oil receiver and supplied to the opening of the axial hole. In the lubrication structure of the transmission, The top wall of the pacing, characterized in that a lubrication structure of a transmission, characterized in that the formation of the ridge that protrudes toward the oil receiver side position where the upper oil receiver.

  According to the present invention, the upper wall of the casing is formed with a protrusion that protrudes toward the oil receiver at a position on the upper side of the oil receiver. When the gear is lifted up by a gear and scattered in the casing, the lubricating oil that adheres to the upper wall of the casing and flows down is separated by a protrusion and falls into the oil receiver. As a result, even when the rotational speed of the transmission shaft is low and a sufficient amount of lubricating oil does not scatter in the casing, the lubricating oil flowing down along the upper wall of the casing can be efficiently sent to the oil receiver by the ridges. Each part of the transmission will not be insufficiently lubricated.

  The best mode for carrying out the lubricating structure of the transmission according to the present invention will be described below with reference to FIGS. As shown in FIG. 1, the transmission to which the lubricating structure according to this embodiment is applied includes an input shaft 12 rotatably supported in a casing 10 via a rolling bearing 11 a, and a lower side of the input shaft 12. And an output shaft 13 rotatably supported through a rolling bearing 11b.

  As shown in FIG. 1, the input shaft 12 and the output shaft 13 are provided with six pairs of transmission gears 21 to 26 that connect them. Of these six pairs of transmission gears 21 to 26, the input side shaft 12 is integrally provided with drive side transmission gears 21 a and 22 a, and these drive side transmission gears 21 a and 22 a are rotatable on the output shaft 13. Are always meshed with driven transmission gears 21b, 22b. The driven transmission gears 21b and 22b are switching sleeves that are spline-engaged in a slidable manner in the axial direction with a clutch hub 14 provided integrally with the output shaft 13 between them and moved in the axial direction by a fork (not shown). 27 is selectively connected to the output shaft 13 for shifting. The input shaft 12 is provided with drive side transmission gears 23 a to 26 a so as to be rotatable. The drive side transmission gears 23 a to 26 a are driven side transmission gears 23 b to 23 b provided integrally with the output shaft 13. 26b is always meshed. The drive-side transmission gears 23a, 24a and the drive-side transmission gears 25a, 26a are spline-engaged in the axial direction so as to be slidable on clutch hubs 15, 16 provided integrally with the input shaft 12 between them. The changeover sleeves 28 and 29 that move in the axial direction by the forks that are not connected are selectively connected to the input shaft 12 for shifting. The transmission in the present embodiment is of the synchromesh type, but a synchronizer such as synchronizer ring is well known and will not be described.

  As shown in FIGS. 1 and 2, the input shaft 12 is coaxially formed with an axial hole 12b that reaches the position beyond the drive-side transmission gear 22a from the end face on the left end side. The direction hole 12 b is opened on the end surface of one end of the input shaft 12. Further, the input shaft 12 is formed with a plurality of radial radial holes 12c that communicate the axial hole 12b and the outer peripheral surface of the position where the drive side transmission gears 23a to 26a are rotatably supported. A lubricating oil passage 12a of the input shaft 12 is constituted by the axial hole 12b and the radial hole 12c.

  Similar to the input shaft 12, the output shaft 13 is coaxially formed with an axial hole 13 b extending from the end face on one end side on the left side to the other end side, and the axial hole 13 b is formed on the output shaft 13. It opens to the end surface of the one end part. Further, the output shaft 13 is formed with a plurality of radial radial holes 13c communicating with the axial hole 13b and the outer peripheral surface at a position where the driven transmission gears 21a and 22a are rotatably supported. A lubricating oil passage 13a of the output shaft 13 is constituted by the axial hole 13b and the radial hole 13c.

  As shown in FIG. 1, a recess 10 b and a rolling bearing 11 b are provided on the inner side of the left end portion 10 a of the casing 10 at a position facing the end surface of one end portion of the input shaft 12 supported via the rolling bearing 11 a. A concave portion 10c is formed at a position facing the end face of one end portion of the output shaft 13 supported via the intermediate shaft. In these recesses 10b and 10c, there are provided guide members 17 and 18 comprising cylindrical portions 17a and 18a and flange portions 17b and 18b extending radially outward from one end edges of the cylindrical portions 17a and 18a. The guide members 17 and 18 are provided with gaps S1 and S2 between the flanges 17b and 18b and the inner surfaces of the recesses 10b and 10c, respectively. The flanges 17b and 18b are inserted into the axial holes 12b and 13b so as to be freely rotatable, with the outer peripheral portions of the flanges 17b and 18b being formed between the inner side of the end 10a of the casing 10 and the rolling bearings 11a and 11b. It is fitted and fixed between.

  As shown in FIG. 1 and FIG. 2, a groove-shaped input shaft oil receiver (oil) whose upper side extending in the axial direction of the input shaft 12 is opened at a position close to the side wall of the casing 10 at an upper portion in the casing 10. Receiver) 31 is provided. The input shaft oil receiver 31 is supported by the casing 10 so as to be inclined downward so that one end side where the axial hole 12b of the input shaft 12 is opened is on the lower side. The lower left end portion is in communication with the gap S1. As shown in FIG. 2, a protrusion 10 d that protrudes downward toward the input shaft oil receiver 31 is formed on the upper wall of the casing 10 at a position along the upper side of the input shaft oil receiver 31.

  As shown in FIGS. 1 and 2, in the middle part in the vertical direction in the casing 10, for the groove-shaped output shaft in which the upper side extending in the axial direction of the output shaft 13 is opened at a position close to the side wall of the casing 10. An oil receiver 32 is provided. The output shaft oil receiver 32 is supported by the casing 10 so as to be inclined downward so that one end side where the axial hole 13b of the output shaft 13 is opened is on the lower side. The lower left end portion communicates with the gap S2. In this embodiment, unlike the input shaft oil receiver 31 provided in the upper part of the casing 10, the output shaft oil receiver 32 is disposed in the middle portion of the casing 10 in the vertical direction. 32 can sufficiently receive the lubricating oil pumped up by each of the transmission gears 21b to 26b. Therefore, unlike the input shaft oil receiver 31, the protrusion 10d is not provided on the upper side, but the output shaft oil receiver When the lubricating oil cannot be sufficiently received by 32, a protrusion may be provided on the casing 10 at the upper position.

  As shown in FIGS. 1 and 2, in the bottom space of the casing 10, the output shaft 13 is provided so as to surround substantially lower half portions of the transmission gears 21 b to 26 b arranged in the lower part of the six transmission gears 21 to 26. An oil separator 19 extending along the axial direction is provided. The oil separator 19 is supported by the casing 10 with both ends in the longitudinal direction of the output shaft 13 sealed with seals 19a. The oil separator 19 has a substantially U-shaped cross-section in a direction orthogonal to the axial direction of the output shaft 13, and oil between the driven transmission gears 23b and 24b and between the driven transmission gears 25b and 26b. The separator 19 has a small U shape along the output shaft 13. Under the oil separator 19, six lubrication holes 19b communicating with the space of the bottom of the casing 10 are formed at positions below the transmission gears 21b to 26b, and the transmission gears 21b to 26b include The lubricating oil accommodated between the bottom part of the casing 10 and the oil separator 19 is supplied from each of the lubricating holes 19b.

  The operation and effect of the lubricating structure of the transmission configured as described above will be described. In this transmission, when each of the transmission gears 21a to 26a and 21b to 26b is not rotating, the lubricating oil accommodated between the bottom of the casing 10 and the oil separator 19 enters the oil separator 19 from each lubricating hole 19b. Inflow. When the input shaft 12 is rotationally driven by the engine of the automobile that drives the transmission, the transmission gears 21b to 26b scoop up and scatter the lubricating oil in the oil separator 19, and the transmission gears 21a to 26a and 21b to 26b. The switching sleeves 27 to 29 and the parts of the transmission such as a fork (not shown) that move the switching sleeves 27 to 29 in the axial direction are splashed and lubricated.

  At this time, a part of the scattered lubricating oil directly flows into the oil receiver 31 for the input shaft, and lubrication adhered to the upper wall of the casing 10 as indicated by an arrow at the upper portion of the casing 10 in FIG. When the oil flows down along the side wall, the oil is separated from the upper wall by the protrusion 10d and flows into the oil receiver 31 for the input shaft. Lubricating oil that has entered the oil receiver 31 for the input shaft enters the gap S1 due to its inclination, flows into the axial hole 12b of the input shaft 12 from the gap S1, passes through the guide member 17, and passes through each radial hole 12c. Such as a fork (not shown) that is supplied to the outer peripheral surface that rotatably supports the transmission gears 23a to 26b, moves the bearings of the transmission gears 23a to 26b, the switching sleeves 28 and 29, and the switching sleeves 28 and 29 in the axial direction. Lubricate each part of the transmission.

  Further, a part of the scattered lubricating oil directly flows into the output shaft oil receiver 32, and the lubricating oil in the output shaft oil receiver 32 enters the gap S2 due to the inclination thereof. Lubricating oil in the gap S2 passes through the guide member 18 and enters the axial hole 13b of the output shaft 13. From each radial hole 13c, the bearings of the transmission gears 21b and 22b, the switching sleeve 27, and the switching sleeve 27 are pivoted. Lubricate each part of the transmission such as a fork that moves in the direction.

  As described above, according to the lubricating structure of the transmission according to the present invention, the protrusion protruding toward the input shaft oil receiver 31 at the position along the upper side of the input shaft oil receiver 31 on the upper wall of the casing 10. Since 10d is formed, when the lubricating oil accommodated in the bottom of the casing 10 is lifted up by the plurality of pairs of transmission gears 21 to 26 and scattered in the casing 10, it adheres to the upper wall of the casing 10 and flows down. The lubricating oil is separated from the upper wall by the protrusion 10d and falls into the oil receiver 31 for the input shaft. Thereby, even when the rotational speed of the input shaft 12 is low and the lubricating oil does not sufficiently scatter in the casing 10, the lubricating oil that flows down along the upper wall of the casing 10 is efficiently input to the oil receiver 31 for the input shaft by the protrusion 10d. In the vicinity of a bearing portion of each of the transmission gears 21 to 26, the switching sleeves 28 and 29, and a fork (not shown) that moves the switching sleeves 28 and 29 in the axial direction is not insufficiently lubricated.

It is sectional drawing which shows the principal part of one Embodiment of the transmission by this invention. It is AA sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Casing, 10d ... Projection, 12, 13 ... Transmission shaft (input shaft, output shaft), 12a ... Lubricating oil passage, 12b ... Axial hole, 12c ... Radial hole, 21a, 21b-26a, 26b ... Shift Gear, 31 ... Oil receiver.

Claims (1)

A casing containing lubricating oil at the bottom,
A plurality of transmission shafts supported parallel to each other in the casing;
A plurality of pairs of transmission gears provided on the transmission shafts to selectively connect the transmission shafts;
An axial hole formed coaxially with the transmission shaft and opened at one end of the transmission shaft, and a radial hole formed in the transmission shaft in a radial direction to communicate the axial hole and the outer peripheral surface of the transmission shaft. A lubricating oil passage composed of a radial hole;
A groove-shaped oil receiver that extends in the axial direction of the transmission shaft in the casing and is inclined so that the one end side of the transmission shaft is on the lower side;
A transmission in which the lubricating oil at the bottom of the casing is lifted by the plurality of pairs of transmission gears and scattered in the casing, and the scattered lubricating oil is received by the oil receiver and supplied to the opening of the axial hole. In the lubrication structure of
A lubricating structure for a transmission, wherein a protrusion that protrudes toward the oil receiver is formed at a position on an upper side of the oil receiver on an upper wall of the casing.

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