JP2010151187A - Lubrication structure of transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubrication structure of a transmission, capable of stably supplying lubrication oil to a taper roller bearing. <P>SOLUTION: In the lubrication structure of the transmission, a housing 18 mounted with the taper roller bearing 34 supporting a shaft 24 is formed with a communication hole 60 for introducing the lubrication oil from the outside of the taper roller bearing 34 in a direction of positioning a large diameter part 34A to its small diameter part 34B. A housing wall 18A in the direction of positioning the large diameter part 34A is provided with an approximately box-shaped oil collecting part 70 opened upward to surround the opening 62 of the communication hole 60 and an oil-introducing means 72 having a blocked cross section for receiving the lubrication oil which is changed into droplets due to the scratching up of a gear Zc5, changing the droplet direction, and introducing the oil to the opening 70A of the oil collecting part 70. This composition allows the sufficient lubrication oil to be collected in the oil collecting part 70 via the oil introducing means 72, which can stably supply the lubrication oil to the taper roller bearing 34 communicating with the oil collecting part 70. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lubricating structure for supplying lubricating oil to a tapered roller bearing of a transmission.

As a transmission lubrication structure, as described in Japanese Patent Application Laid-Open No. 2002-221273 (Patent Document 1), there has been proposed one that supplies lubricating oil pumped up by a gear in a main housing of a transmission case to a sub housing. ing. In this lubricating structure, a through hole is provided in the upper part of the partition wall that partitions the transmission case into the main housing and the sub housing, and a rib that extends from the main housing to the sub housing is provided on the top of each housing so as to pass through the through hole. Is adopted. Since the rib has an inclination downward from the main housing to the sub-housing, the lubricating oil adhering to the top due to the lifting of the gear flows through the side wall of the rib and is supplied to the rear chamber.
JP 2002-221273 A

  However, this lubrication structure is a supply system that drops the lubricating oil adhering to the top after being transferred to the ribs, so the viscosity of the lubricating oil, vibration of the engine and transmission, operating conditions such as deceleration and downhill, etc. In some cases, the lubricating oil falls into the main housing before reaching the sub-housing. For this reason, the supply amount is likely to fluctuate and it is difficult to stably supply the lubricating oil. In addition, since the rib extending from the main housing to the sub-housing extends in the longitudinal direction on the ceiling, the manufacturability is poor and the manufacturing cost is greatly increased due to a significant design change.

  In view of the above-described conventional problems, the present invention provides a lubrication structure for a transmission that can reduce the manufacturing cost and stably supply lubricating oil to a predetermined location without significantly changing the design of the housing. For the purpose.

  For this reason, the lubricating structure of the transmission according to the present invention allows the lubricating oil to be supplied from the outside in the direction in which the large-diameter portion of the tapered roller bearing is located to the small-diameter portion of the housing to which the tapered roller bearing that supports the shaft is attached. A lubricating structure for a transmission in which a communication hole is formed, and a substantially box-shaped oil sump that opens upward on a housing wall in a direction in which the large-diameter portion is located so as to surround the opening of the communication hole And an oil guide means having a closed cross section that receives the lubricating oil splashed by the gear scraping and changes the spray direction to lead to the opening of the oil reservoir.

  According to the present invention, when the shaft rotates, the lubricating oil that has been swept up by the gears and splashed directly from above the oil sump accumulates, and the direction of the splash is changed by the oil guiding means and the oil is changed. Guided to a pool. Therefore, in addition to the lubricating oil that jumps in directly, the lubricating oil guided by the oil guiding means also accumulates in the oil reservoir, so that sufficient lubricating oil is accumulated. The lubricating oil sufficiently accumulated in the oil sump fills the communication hole, and the oil level is above the opening of the communication hole. For example, the vehicle may rise forward due to driving conditions such as sudden acceleration or uphill. Even then, it is reliably guided to the small diameter part and lubricates the bearing rolling surface. As described above, since sufficient lubricating oil is collected in the oil reservoir, the lubricating oil can be stably supplied to the tapered roller bearing.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows the overall configuration of a transmission to which the present invention is applied.
The transmission 10 has a wide range and a crossed shift stage. Therefore, on the input side and the output side of the main transmission 12, a splitter 14 and a range 16 serving as a sub-transmission for switching to at least a high speed stage or a low speed stage are provided. Each of them is connected. The main transmission 12 and the splitter 14 are housed in the main housing 18, while the range 16 is housed in the sub-housing 20, and the main housing 18 and the sub-housing 20 are fastened with bolts at the joint surface 22 and integrated. The An input shaft 24 and a main shaft 26 are coaxially arranged in the main housing 18, and a main counter shaft 28 is arranged in parallel below the main shaft 26. On the other hand, when the sub housing 20 is integrated with the main housing 18, an output shaft 30 is disposed coaxially with the main shaft 26, and a sub counter shaft 32 is disposed in parallel below the output shaft 30.

  The intermediate portion of the input shaft 24, the rear end portion of the main shaft 26, both end portions of the main counter shaft 28, and the front end portion of the sub counter shaft 32 are respectively connected to the main housing via taper roller bearings 34, 36, 38 and 40. 18 is rotatably fixed. An intermediate portion of the output shaft 30 and a rear end portion of the sub counter shaft 32 are rotatably fixed to the sub housing 20 via a ball bearing 42 and a tapered roller bearing 44, respectively. The front end portion of the main shaft 26 is supported to be rotatable relative to the rear end portion of the input shaft 24 via a tapered roller bearing 46 as a pilot bearing. The front end portion of the output shaft 30 is supported so as to be rotatable relative to the rear end portion of the main shaft 26 via a roller bearing 48 serving as a pilot bearing.

  A splitter gear Zm5 for switching the splitter 14 to a high speed stage is freely fitted to an input shaft 24 to which rotational driving force is input from an engine or the like, and a synchronizer hub that constitutes a synchromesh mechanism 50 at the tip thereof. 50A is fixed. A drive gear Zm4, a third speed gear Zm3, a second speed gear Zm2, a first speed gear Zm1 and a reverse gear ZmR, which constitute each gear stage of the main transmission 12, are fitted to the main shaft 26 so as to freely rotate. The range high gear Zr1 for switching the range 16 to the high speed stage is fixed. The main shaft 26 between the drive gear Zm4 and the third speed gear Zm3, the second speed gear Zm2 and the first speed gear Zm1, and the first speed gear Zm1 and the reverse gear ZmR is respectively a synchronizer hub 50A constituting the synchromesh mechanism 50. Is fixed.

  On the other hand, the main countershaft 28 has a splitter gear Zm5, a drive gear Zm4, a third speed gear Zm3, a second speed gear Zm2 and a first speed gear Zm1, and a counter splitter gear Zc5, a counter drive gear Zc4, and a counter third speed gear. Zc3, second counter gear Zc2 and first counter gear Zc1 are fixed. Although not clearly shown in the figure, a counter reverse gear ZcR that always meshes with the reverse gear ZmR is fixed to the main counter shaft 28 via a reverse idler gear ZmR1.

  The output shaft 30 is integrally formed with a synchronizer hub 50A constituting the synchromesh mechanism 50 at the front end portion thereof, and a range low gear Zr2 for switching the range 16 to a low speed stage is fitted freely. A range counter high gear Zcr1 and a range counter low gear Zcr2 that are always meshed with the range high gear Zr1 and the range low gear Zr2 are fixed to the sub-counter shaft 32, respectively.

  A synchronizer sleeve 50B that reciprocally slides in the axial direction is splined to the outer periphery of each synchronizer hub 50A constituting the synchromesh mechanism 50. Then, by sliding the synchronizer sleeve 50B in the direction of the synchronized gear, the synchronizer ring is pressed against the friction surface of the synchronized gear, and the relative rotation between the synchronized gear and the synchronized gear is eliminated by the friction. Done.

  In the transmission 10 having such a configuration, the main transmission 12 and the range 16 constitute six forward speeds and one reverse speed, and each of these gear speeds is shifted by a half speed by the splitter 14, so that the forward 12 speeds and the reverse 2 speeds. A multi-stage transmission is configured.

  Here, as a lubricating structure of the transmission 10, as shown in FIGS. 1 to 3, a large-diameter portion 34 </ b> A of the tapered roller bearing 34 is attached to the main housing 18 to which the tapered roller bearing 34 that supports the input shaft 24 is attached. A communication hole 60 that guides the lubricating oil from the outside in the direction in which it is positioned to the small diameter portion 34B is formed (see FIGS. 2B and 3). The housing wall 18A in the direction in which the large-diameter portion 34A is located is splashed by the substantially box-shaped oil sump 70 that opens upward so as to surround the opening 62 of the communication hole 60 and the counter splitter gear Zc5. An oil guiding means 72 having a closed cross section that receives the lubricating oil and changes its spray direction and leads to the opening 70A of the oil reservoir 70 is provided.

  The oil sump 70 and the oil guiding means 72 are configured by attaching a thin plate 80 to the tip of each rib that rises substantially vertically from the housing wall 18A that constitutes each of these constituent members. That is, the plate 80 is used as a side wall parallel to the housing wall 18 </ b> A among the side walls constituting the oil reservoir 70 and the oil guiding means 72. Specifically, the oil reservoir 70 has a bottom wall rib 70B and a pair of side wall ribs 70C and 70D extending upward from both end portions thereof, and is vertically raised from the housing wall 18A. The first rib 72A that extends so that the distance from the side wall 70C gradually decreases from the lower side to the upper side, and the opening 70A of the oil reservoir 70 that is bent from the upper end of the first rib 72A. And a second rib 72B extending toward the vertical direction from the housing wall 18A. Then, the plate 80 is fastened to the front end portions of the bottom wall rib 70B and the side wall ribs 70C and 70D with screws 82 in a state where the plate 80 is in contact with the front end portions of the first rib 72A and the second rib 72B. And the oil guiding means 72 are configured. The plate 80 is configured to be integrally attached to the oil reservoir 70 and the oil guiding means 72, but may be separately attached to the oil reservoir 70 and the oil guiding means 72.

  Further, in the lubrication structure of the transmission 10, guide means 74 that receives the lubricating oil discharged from the oil guiding means 72 and guides it to the opening 70 </ b> A of the oil reservoir 70 is formed above the opening 70 </ b> A of the oil reservoir 70. The guide means 74 is formed by guide ribs 74A extending substantially vertically from the housing wall 18A.

  According to this lubricating structure, when the main housing 18 is manufactured by casting, the ribs 70B to 70D, 72A, 72B, and 74A can be integrally formed at the same time with a slight design change, without significantly increasing the manufacturing cost. Manufacturability can be improved. In addition, since the plate 80 is a single thin plate having a simple shape, the manufacturing cost is minimized.

  In the transmission 10 having such a lubrication structure, when a rotational driving force is input to the input shaft 24, the counter splitter gear Zc5 that meshes with the splitter gear Zm5 fixed thereto is rotated and is located below the main housing 18. Lubricating oil is lifted. As shown in FIG. 2A, the lubricating oil that has been lifted and splashed directly jumps into and accumulates from the opening 70 </ b> A of the oil reservoir 70 and jumps into the oil guiding means 72 from below. When the lubricating oil jumped into the oil guiding means 72 hits the first rib 72A of the oil guiding means 72 and the splash direction is changed upward, the lubricating oil further hits the second rib 72B to the opening 70A of the oil reservoir 70. The spray direction is changed and discharged from the oil guiding means 72. The discharged lubricating oil is guided to the oil reservoir 70, or hits the guide rib 74A of the guide means 74 and guided to the oil reservoir 70.

  Here, since the oil reservoir 70 has a substantially box-shaped configuration that opens upward, the oil can be reliably accumulated without being influenced by driving conditions such as vibration of the transmission or downhill. . Further, the oil guiding means 72 receives the lubricating oil that has become splashed and changes the direction of the splashing to the opening 70A of the oil reservoir 70, so that the lubricating oil that has jumped in is guided to the oil reservoir 70 without waste. Can do. Further, the guide means 74 receives the lubricating oil that is about to exceed the oil reservoir 70 out of the lubricating oil discharged from the oil guiding means 72, and guides the splash direction to the opening 70A of the oil reservoir 70. The lubricating oil discharged from the oil means 72 can be collected in the oil reservoir 70 without waste. For this reason, in addition to the lubricating oil jumping into the opening 70A, the lubricating oil guided by the oil guiding means 72 and the lubricating oil guided by the guiding means 74 are added to the oil reservoir 70. Oil begins to accumulate.

  The lubricating oil sufficiently accumulated in the oil reservoir 70 by the oil reservoir 70, the oil guiding means 72, and the guide means 74 fills the communication hole 60 and its oil surface is above the opening 62 of the communication hole 60. Even if the vehicle rises forward due to driving conditions such as sudden acceleration or uphill, it is surely supplied to the small diameter portion 34B of the tapered roller bearing 34. Thereafter, the lubricating oil guided to the small diameter portion 34 </ b> B lubricates the rolling surface toward the large diameter portion 34 </ b> A and falls to the lower portion of the main housing 18.

  According to such a lubricating structure of the transmission 10, the oil sump 70 and the oil guiding means 72 can be provided by a slight design change of the housing wall 18A, so that the manufacturing cost can be suppressed. Further, since sufficient lubricating oil can be stored in the oil reservoir 70 via the oil guiding means 72, the lubricating oil can be stably supplied to the tapered roller bearing 34 communicating with the oil reservoir 70.

  In the above embodiment, the lubrication structure is applied to the tapered roller bearing 34 that supports the input shaft 24. However, the same lubrication structure is also applied to the taper roller bearing, the roller bearing, and the ball bearing that support other shafts. be able to.

Overall configuration diagram of a transmission to which the present invention is applied Partial schematic showing the main part The partial schematic which added each communicating path (broken line) which comprises a communicating hole to the principal part of FIG. 2 is a longitudinal sectional view taken along line aa in FIG.

Explanation of symbols

18 Main housing 18A Housing wall 24 Input shaft 34 Tapered roller bearing 34A Large diameter portion 34B Small diameter portion 60 Communication hole 62 Opening 70 Oil reservoir 70A Opening 70B Bottom wall ribs 70C, 70D Side wall rib 72 Oil guiding means 72A First rib 72B First 2 rib 74 guide means 74A guide rib 80 plate 82 screw Zc5 counter splitter gear

Claims (6)

A transmission lubrication structure in which a communication hole is formed in a housing to which a tapered roller bearing that supports a shaft is attached, and a communication hole that guides lubricating oil from the outside in the direction in which the large diameter portion of the tapered roller bearing is located to the small diameter portion. There,
The housing wall in the direction in which the large-diameter portion is located receives a substantially box-shaped oil sump that opens upward so as to surround the opening of the communication hole, and the lubricating oil that has become splashes due to the lifting of the gear. A lubricating structure for a transmission, comprising: an oil guiding means having a closed cross section that changes the direction of splashing and leads to the opening of the oil reservoir.   A first rib located on the side of the oil reservoir and extending so that a distance from the side wall gradually decreases from below to above; an opening of the oil reservoir bent from the upper end of the first rib; A second rib extending toward the top of the housing wall, and a plate is attached to the side wall, the first rib, and the tip of the second rib. 2. A lubricating structure for a transmission according to claim 1, wherein said oil guiding means is constituted.   The lubricating structure for a transmission according to claim 2, wherein the plate is formed integrally with a side wall of the oil sump that is parallel to the housing wall.   The lubricating structure for a transmission according to claim 3, wherein the plate is fastened by screws to a bottom wall constituting the oil reservoir and a pair of side walls extending upward from both ends thereof.   The guide means for receiving the lubricating oil discharged from the oil guiding means and guiding it to the oil reservoir opening is formed above the oil reservoir opening. The lubrication structure of the transmission according to Item 1.   6. The transmission lubrication structure according to claim 5, wherein the guide means is formed by guide ribs extending substantially perpendicularly from the housing wall.

Images