JP2018155338A - Lubrication structure of power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the circulation of a lubricant to a bearing part of a pinion gear, in a power transmission device using a planetary gear mechanism.SOLUTION: In a lubrication structure of a power transmission device which comprises a rotating member (gear) 12 arranged at one side along a rotation center line of a planetary gear mechanism 16, and fit to a sun gear 18 so as to integrally rotate together with the sun gear 18, and supplies a lubricant to a bearing part 64 of a pinion gear 22 via a first oil path 58 which is extended along a radial direction of a carrier 28 arranged at the rotating member 12 side of the planetary gear mechanism 16, a second oil path 56 for making both side faces of the rotating member 12 communicate with each other, and making the lubricant circulate is formed at a fitting part 21 between the sun gear 18 and the rotating member 12, a tooth face of the sun gear 18 is extended up to a position opposing an opening 59 of the first oil path 58 along the rotation center line, and a guide groove 80 for guiding the lubricant to the opening 59 is formed at the tooth face of the sun gear 18 which opposes the opening 59.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lubricating structure for a power transmission device using a planetary gear mechanism.

  In the power transmission device using the planetary gear mechanism, the structure for supplying the lubricating oil to the bearing portion of the pinion gear is as follows: an oil passage provided along the axial direction of the rotation shaft provided at the rotation center of the planetary gear mechanism. The supplied lubricating oil is discharged through an oil hole established along the radial direction of the rotating shaft, and the discharged lubricating oil is extended inside the carrier along the radial direction. There is known a structure in which a bearing and a bearing portion are circulated through an oil passage formed along the axial direction and the radial direction of the passage and a support shaft of the pinion gear.

Japanese Patent Laid-Open No. 02-154837

  However, when the oil passage along the axial direction cannot be formed on the rotation shaft arranged at the rotation center of the planetary gear mechanism, the configuration of the prior art is not established, and another configuration needs to be considered.

As an example in which an oil passage along the axial direction cannot be formed on the rotation shaft arranged at the rotation center, a case where a planetary gear mechanism is used as a final reduction gear of a vehicle power transmission device can be cited. In this case, a configuration in which a rotation shaft disposed at the rotation center of the planetary gear mechanism is a drive shaft connected to the wheels is generally used, and an oil passage for supplying lubricating oil of the planetary gear mechanism to the drive shaft is provided. It is extremely difficult to form.
Therefore, a configuration in which the lubricating oil is supplied from the outer side of the planetary gear mechanism to the space on the inner diameter side of the carrier can be considered, but simply by supplying the lubricating oil so as to accumulate in the space, the lubricating oil is formed on the carrier. It is considered that the lubricating oil passage is not accurately guided and is discharged from a gap or the like existing in the vicinity, so that sufficient lubricating oil cannot be supplied to the bearing portion of the pinion gear.

  The present invention was devised in view of such problems, and in a power transmission device using a planetary gear mechanism, an object thereof is to appropriately ensure lubrication to the bearing portion of the pinion gear, and in particular, the rotation center of the planetary gear mechanism. In the configuration in which it is difficult to form an oil passage on the rotating shaft disposed in the cylinder, the effect is exhibited.

  (1) In order to achieve the above object, a lubricating structure for a power transmission device according to the present invention includes a planetary gear mechanism including a sun gear, a pinion gear, a ring gear, and a carrier that supports the pinion gear, and a rotation center of the planetary gear mechanism. A rotating member disposed on one side along the line and fitted to the sun gear so as to rotate integrally with the sun gear, and the radial direction of the carrier disposed on the rotating member side of the planetary gear mechanism A lubricating structure of a power transmission device that supplies lubricating oil to a bearing portion of the pinion gear through a first oil passage extending along the first oil passage, and the rotating member is connected to a fitting portion between the sun gear and the rotating member. A second oil passage that allows the lubricating oil to flow through the both side surfaces thereof, and the tooth surface of the sun gear extends along the rotation center line to a position facing the opening of the first oil passage. , Against the opening The tooth surface of the sun gear which is characterized in that guide grooves to induce lubricant to the opening is formed.

(2) It is preferable that the guide groove is formed on a tooth surface on the side facing in the rotational direction when the power transmission mechanism is normally used.
(3) It is preferable that the annular member is attached to the sun gear so that the outer diameter surface faces and adjoins the carrier inner diameter surface located between the opening and the pinion gear end surface.

(4) Further, the lubricating structure of the power transmission device of the present invention is arranged on one side along the rotation center line of the planetary gear mechanism, and a planetary gear mechanism including a sun gear, a pinion gear, a ring gear, and a carrier that supports the pinion gear. And a rotating member fitted to the sun gear so as to rotate integrally with the sun gear, and extending along the radial direction of the carrier disposed on the rotating member side of the planetary gear mechanism. A lubrication structure of a power transmission device that supplies lubricating oil to a bearing portion of the pinion gear via a single oil passage, wherein both side surfaces of the rotating member are communicated with a fitting portion between the sun gear and the rotating member. Forming a second oil passage through which lubricating oil is circulated, and extending the tooth surface of the sun gear to a position facing the opening of the first oil passage along the rotation center line, Opening and pinion gear end Adjacent to the carrier inner surface positioned to face, is characterized in that mounting the annular member to said sun gear between.
It is characterized by

  (5) Furthermore, it is preferable that the side surface on the opening side of the annular member is configured to be located closer to the pinion gear than the center of the opening.

  According to the present invention, the lubricating oil supplied to the space on the carrier inner diameter side through the second oil passage is guided along the guide groove formed in the tooth surface of the sun gear by the centrifugal force generated by the rotation of the sun gear. Since it is guided to the opening of the first oil passage, a large amount of lubricating oil can be supplied to the bearing portion of the pinion gear through the first oil passage.

  Further, according to the present invention, by mounting the annular member on the sun gear so that the outer diameter surface is adjacent to and opposed to the carrier inner diameter surface located between the opening and the pinion gear end surface, the carrier inner diameter side The lubricating oil supplied to the space portion can be prevented from flowing out toward the meshing portion of the sun gear and pinion gear (center portion of the planetary gear mechanism), and more lubricating oil can be supplied to the bearing portion. .

It is a partial longitudinal cross-sectional view which shows the structure of the power transmission device to which the lubrication structure which concerns on one Embodiment of this invention is applied. It is an enlarged view which expands and shows the range shown with the code | symbol A in FIG. It is a perspective view which shows partially the extension part of the sun gear tooth surface in one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment. Each configuration of the following embodiments can be implemented with various modifications without departing from the spirit thereof, and can be selected or combined as appropriate.

  A gear (rotating member) 12 that meshes with an output gear of a transmission is supported via two bearings 14 in a transmission case 10 (not shown) mounted on the vehicle. This gear 12 is fitted to the outer peripheral surface of a cylindrical extension portion 20 extending in the axial direction from the main body of the sun gear 18 of the planetary gear mechanism 16 as a final reduction device through a spline 21 so as not to be relatively rotatable. .

The planetary gear mechanism 16 has a conventionally known structure, and includes a sun gear 18, a plurality of pinion gears 22 (only one is shown in the figure) meshed with the sun gear 18, and a ring gear meshed with the pinion gear 22 on the outer periphery of the pinion gear 22. 24 and carriers 28 and 29 that rotatably support the pinion gear 22 via a support shaft 26.
The carriers 28 and 29 are connected and fixed to the case 10 at positions not shown.

  The ring gear 24 is connected to a differential case 36 of a differential mechanism 34 by a bolt 32 with a cylindrical extension 30 extending from the main body along the axial direction.

The differential mechanism 34 has a conventionally well-known structure, and includes two pinion gears 38 and two side gears 40 (only a part of them are shown in the drawing), and the two side gears 40 are connected to left and right drive shafts 42, respectively. ing.
The differential case 36 has a cylindrical extension 44 into which the drive shaft 42 is inserted, spline-connected at the inner end (left end in the figure), and the outer end of the cylindrical extension 44 (see FIG. The middle and right end portions) are supported by the case 10 via bearings 46.
Note that an oil seal 48 is mounted on the outer side of the bearing 46 to hold the space between the outer peripheral surface of the drive shaft 42 and the case 10 in a liquid-tight manner.

Here, a lubricating structure according to an embodiment of the present invention will be described.
The case 10 is provided with an oil supply passage 52 for supplying lubricating oil into a space 50 formed near the outer end (right end in the figure) of the spline 21 fitting portion between the gear 12 and the cylindrical extension portion 20. The oil supply passage 52 is supplied with lubricating oil from an oil pump or the like through an oil passage (not shown) communicating from the outside of the case 10.

  In the spline 21, one of spline teeth formed on either the gear 12 side or the cylindrical extension 20 side is missing over the entire length thereof, whereby the space 50 and the carrier 28 are removed. An oil passage (second oil passage) 56 is formed which communicates with the space portion 54 formed on the inner diameter side (that is, communicates between both side surfaces of the gear 12).

  On the other hand, an oil passage (first oil passage) 58 is formed in the inside of the carrier 28 disposed on the gear 12 side along the radial direction, and the oil passage 58 and the support shaft 26 of the pinion gear 22 are connected to the carrier 28. A first radial oil passage 60 drilled along the radial direction at a matching position, an axial oil passage 62 provided along the axial direction of the support shaft 26 and communicating with the oil passage 60, and a radial direction of the support shaft 26 A second radial oil passage 66 is formed that communicates between the axial oil passage 62 and the bearing portion 64 that supports the pinion gear 22.

Further, as shown in FIG. 2, the sun gear 18 is provided with an extended tooth surface portion 68 whose tooth surface extends to a position facing the opening 59 of the oil passage 58, and a snap ring 74 (annular member) is mounted. The snap ring 74 is mounted at a position where the outer diameter surface 70 thereof is adjacent to and opposed to the inner diameter surface 72 of the carrier 28 located between the opening 59 and the end face of the pinion gear 22 on the carrier 28 side.
In the above configuration, the thickness of the snap ring 74 is adjusted such that the side surface 76 of the snap ring 74 on the opening 59 side is positioned on the pinion gear 22 side from the center 78 of the opening 59.

  Further, a guide groove 80 for guiding the lubricating oil to the opening 59 is formed in the tooth surface of the extended tooth surface portion 68 along the radial direction.

  If the arrow B shown in FIG. 3 is the rotational direction of the sun gear 18 during forward traveling of the vehicle (the rotational direction when the power transmission mechanism is normally used), the guide groove 80 has a tooth surface in the rotational direction B, in other words, For example, it is formed on the tooth surface that bears the tooth surface of the pinion gear 22 and carries power transmission during forward traveling.

With the above configuration, the lubricating oil supplied from the oil supply passage 52 to the space portion 50 flows into the space portion 54 formed on the inner diameter side of the carrier 28 via the oil passage 56.
The lubricating oil in the space 54 is guided toward the opening 59 of the oil passage 58 along the guide groove 68 by the centrifugal force accompanying the rotation of the sun gear 18, that is, the rotation of the extended tooth surface portion 68. 58 flows into.
The lubricating oil that has flowed into the oil passage 58 flows through the first radial oil passage 60, the axial oil passage 62, and the second radial oil passage 66, and is supplied to the bearing portion 64 to be supplied to the bearing 64. Lubricate and cool.

  Since the lubricating structure of the power transmission device according to the embodiment of the present invention is configured as described above, the lubricating oil supplied to the space portion 54 on the inner diameter side of the carrier 22 through the oil passage 56 is used as the lubricating oil of the sun gear 18. Due to the centrifugal force generated by the rotation, the oil is guided to the opening 59 of the oil passage 58 along the guide groove 80 formed on the tooth surface of the sun gear 18. It becomes possible to supply to the unit 64.

  Further, according to one embodiment of the present invention, the snap ring is formed such that the outer diameter surface 70 is opposed to the inner diameter surface 72 of the carrier 28 located between the opening 59 and the end face on the carrier 28 side of the pinion gear 22. By attaching 74 to the sun gear 18, the lubricant supplied to the space portion 54 on the inner diameter side of the carrier 28 is prevented from flowing out toward the meshing portion (the center portion of the planetary gear mechanism) between the sun gear 18 and the pinion gear 22. More lubricating oil can be supplied to the bearing portion 64.

  Further, since the guide groove 80 is formed on the tooth surface toward the rotational direction of the sun gear 18 during the forward traveling of the vehicle (the rotational direction when the power transmission mechanism is normally used), the forward traveling occupies most of the vehicle traveling. Sometimes more lubricant can be supplied to the bearing portion 64.

Although the embodiments of the present invention have been described above, the present invention can be implemented by appropriately modifying such embodiments.
For example, in the above embodiment, the snap ring 74 is used to suppress the outflow of the space portion 54, but the inner diameter surface 72 of the carrier 28 positioned between the opening 59 and the end surface on the carrier 28 side of the pinion gear 22 is used as the sun gear 18. The snap ring 74 can be omitted if it is formed so as to be as close as possible to the outer peripheral surface.

  Further, the tooth groove facing the direction in which the sun gear 18 rotates during reverse travel of the vehicle (that is, the tooth on the opposite side to the surface on which the guide groove 80 is formed in the above embodiment with respect to one tooth of the sun gear 18). Surface).

  Further, in the present embodiment, the example in which the lubrication structure of the power transmission device of the present invention is applied to the final reduction mechanism in the vehicle power transmission device is shown, but the lubrication structure of the power transmission device of the present invention is not limited to this. Any power transmission device in which the planetary gear mechanism and the rotating member are disposed adjacent to each other can be widely applied.

12 Gear (Rotating member)
16 planetary gear mechanism 18 sun gear 21 spline fitting portion 22 pinion gear 24 ring gear 28, 29 carrier
56 Oil passage (second oil passage)
58 Oil passage (First oil passage)
59 Opening 64 Bearing portion 68 Extension tooth surface portion 70 Outer diameter surface 72 Inner diameter surface 74 Snap ring (annular member)
80 guide groove

Claims (5)

A planetary gear mechanism including a sun gear, a pinion gear, a ring gear, and a carrier that supports the pinion gear;
A rotating member disposed on one side along the rotation center line of the planetary gear mechanism and fitted to the sun gear so as to rotate integrally with the sun gear;
Lubricating structure of a power transmission device for supplying lubricating oil to a bearing portion of the pinion gear via a first oil passage extending along a radial direction of the carrier disposed on the rotating member side of the planetary gear mechanism Because
Forming a second oil passage in the fitting portion between the sun gear and the rotating member to allow the lubricating oil to flow through both side surfaces of the rotating member,
Extending the tooth surface of the sun gear to a position facing the opening of the first oil passage along the rotation center line,
A lubricating structure for a power transmission device, characterized in that a guide groove for guiding lubricating oil to the opening is formed in a tooth surface of the sun gear facing the opening. 2. The power transmission device according to claim 1, wherein the guide groove is formed on a tooth surface facing in a rotation direction when the power transmission mechanism is normally used. 3. Lubrication structure. The annular member is attached to the sun gear so that the outer diameter surface is adjacent to and faces the carrier inner diameter surface located between the opening and the pinion gear end surface. Lubrication structure of the power transmission device A planetary gear mechanism including a sun gear, a pinion gear, a ring gear, and a carrier that supports the pinion gear;
A rotating member disposed on one side along the rotation center line of the planetary gear mechanism and fitted to the sun gear so as to rotate integrally with the sun gear;
Lubricating structure of a power transmission device for supplying lubricating oil to a bearing portion of the pinion gear via a first oil passage extending along a radial direction of the carrier disposed on the rotating member side of the planetary gear mechanism Because
Forming a second oil passage in the fitting portion between the sun gear and the rotating member to allow the lubricating oil to flow through both side surfaces of the rotating member,
Extending the tooth surface of the sun gear to a position facing the opening of the first oil passage along the rotation center line,
A lubrication structure for a power transmission device, wherein an annular member is attached to the sun gear such that an outer diameter surface faces and adjoins a carrier inner diameter surface located between the opening and a pinion gear end surface. The lubricating structure for a power transmission device according to claim 4, wherein a side surface of the annular member on the opening side is positioned on the pinion gear side with respect to the center of the opening.

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