JP7265337B2 - Lubrication structure of power transmission device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lubricating structure for a power transmission device provided in a vehicle such as an automobile.

In vehicles such as automobiles, the rotation of the output shaft of the power source for driving such as an engine is changed by the speed change mechanism of the transmission, further reduced by the final reduction device, and then transmitted to the left and right driving wheels via the drive shaft. are doing.
In a final reduction gear for the front wheels of a vehicle having a longitudinal transmission in which the rotating shaft is arranged along the longitudinal direction of the vehicle, or in a final reduction gear for the rear wheels driven via a propeller shaft, the reduction gear mechanism includes: Hypoid gears, which are staggered shaft bevel gears, are sometimes used.

As a prior art related to such a power transmission device for a vehicle, for example, Patent Document 1 discloses that a lower part of a ring gear (crown gear) to which a differential case is attached is replaced by a baffle plate, which is a bowl-shaped lubricating oil containing component that opens upward. It is described that the cover reduces the agitation resistance of the lubricating oil accompanying the rotation of the ring gear.
Patent Literature 2 describes that a breather chamber that temporarily stores lubricating oil is formed above a differential carrier, and the lubricating oil drips onto a drive pinion via a lubricating plate that hangs down from the breather chamber.
Patent Literature 3 describes that the lubricating oil scraped up from the oil reservoir by the drive pinion gear is received by a receiving portion and guided to a bearing that supports the side portion of the differential.

JP 2016-166615 A JP-A-2002-295644 JP-A-2017-82837

Hypoid gears are more sensitive to lubrication than other types of gears because of the slippage of the tooth surfaces during rotation. , there is concern about deterioration of transmission efficiency.
For this reason, conventionally, lubricating oil with relatively high viscosity was used to ensure the oil film on the tooth surface. .
In addition, when lubricating oil scooped up by rotating parts such as pinion gears and crown gears is dripped onto the gears as in the above-mentioned prior art, the amount of splashed lubricating oil in the housing must be reduced in order to obtain sufficient lubrication performance. Need to do quite a lot. In order to reduce agitation loss, when the amount of lubricating oil flowing around the crown gear is suppressed by a baffle member, or when the amount of oil in the housing (oil level height) is suppressed, the splashing of lubricating oil in the housing may occur. application of such prior art is difficult.
SUMMARY OF THE INVENTION In view of the problems described above, an object of the present invention is to provide a lubricating structure for a power transmission device that can ensure lubricating performance with a small amount of lubricating oil.

The present invention solves the problems described above by means of the following solutions.
The invention according to claim 1 comprises a crown gear that rotates about a first rotation axis with respect to a housing and is formed in an annular shape that is concentric with the first rotation axis; A lubricating structure for a power transmission device including a pinion gear that rotates around a second rotation axis that intersects or is twisted with the rotation axis of and meshes with the crown gear, wherein has a lubricating oil guide portion fixed to the housing on the inner diameter side of the crown gear, and the lubricating oil guide portion has the pinion gear side horizontal when viewed from the rotation axis direction of the crown gear The power transmission device has a lower surface portion that is arranged to be inclined in a direction higher than the opposite side of the direction, deflects the lubricating oil scooped up by the crown gear from below and guides it to the meshing portion side, A differential mechanism is attached to the side opposite to the tooth side of the crown gear, and the lower surface part deflects a part of the lubricating oil scooped up by the crown gear from below to form a differential case that houses the differential mechanism. The lubricating structure of a power transmission device is characterized in that it guides formed lubricating oil to an opening side leading to the differential mechanism .
According to this, part of the lubricating oil scooped up by the crown gear is deflected at the lower surface of the lubricating oil guide portion and supplied from the inner diameter side of the crown gear to the meshing portion between the crown gear and the pinion gear. It can improve lubrication.
In hypoid gears and spiral bevel gears, lubricating oil supplied to one end of the meshing portion is conveyed along the tooth flanks of each gear to the other end as the tooth flanks slide. Lubricating oil can effectively lubricate the entire tooth surface.
As a result, it is possible to improve transmission efficiency and prevent problems such as seizure, thereby improving reliability.
Also, part of the lubricating oil scooped up by the crown gear is deflected by the lower surface of the lubricating oil guide portion, guided from the tooth portion side of the crown gear to the differential mechanism side, supplied to the differential mechanism, and supplied to the differential mechanism. Reliability can be improved by improving the lubrication of the mechanism. In addition, it is possible to simplify or eliminate other openings for lubrication provided in the differential case, which is a member that houses the differential mechanism, making it easier to secure the strength of the differential case. be able to.

The invention according to claim 2 is characterized by a crown gear formed in an annular shape that rotates about a first rotation axis with respect to a housing and is concentric with the first rotation axis, and a crown gear that rotates with respect to the housing. a pinion gear that rotates about a second rotation axis that intersects or is twisted with the rotation axis of and meshes with the crown gear; and a differential mechanism that is attached to the opposite side of the crown gear In the lubricating structure for a power transmission device, a lubricating oil guide portion fixed to the housing is provided on the inner diameter side of the crown gear, and the lubricating oil guide portion is driven by the crown gear from below. A lubricating structure for a power transmission device, comprising a lower surface portion formed in a differential case that deflects rising lubricating oil and guides the lubricating oil to an opening side that is formed in a differential case that houses the differential mechanism and guides the lubricating oil to the differential mechanism. .
According to this , part of the lubricating oil scooped up by the crown gear is deflected by the lower surface of the lubricating oil guide portion, guided from the tooth portion side of the crown gear to the differential mechanism side, and supplied to the differential mechanism. As a result, the lubricating state of the differential mechanism can be improved and the reliability can be improved. In addition, it is possible to simplify or eliminate other openings for lubrication provided in the differential case, which is a member that houses the differential mechanism, making it easier to secure the strength of the differential case. be able to.
In the invention according to claim 3 , the lower surface portion is inclined in a direction in which the differential mechanism side is higher than the tooth side when viewed from the horizontal direction along the radial direction of the crown gear. A lubricating structure for a power transmission device according to claim 1 or claim 2 .
According to this, the effect of deflecting the lubricating oil scooped up by the crown gear and guiding it to the differential mechanism side can be accelerated, and the above effect can be obtained more reliably.

In the invention according to claim 4 , the lubricating oil guide part is arranged so that the pinion gear side is lower than the opposite side in the horizontal direction when viewed from the rotation axis direction of the crown gear. 4. The lubricating structure for a power transmission device according to any one of claims 1 to 3 , further comprising an upper surface portion that deflects dripping lubricating oil and guides it toward the meshing portion.
In the invention according to claim 5, the power transmission device includes a differential mechanism attached to the side opposite to the tooth side of the crown gear, and the upper surface portion deflects a part of the lubricating oil dripping from above. 5. The lubricating structure of the power transmission device according to claim 4, wherein the lubricating oil is guided to an opening side formed in a differential case housing the differential mechanism and introducing lubricating oil into the differential mechanism.
The invention according to claim 6 is characterized by a crown gear formed in an annular shape that rotates about a first rotation axis with respect to the housing and is concentric with the first rotation axis, and a crown gear that rotates with respect to the housing. A lubricating structure for a power transmission device including a pinion gear that rotates around a second rotation axis that intersects or is twisted with the rotation axis of and meshes with the crown gear, wherein has a lubricating oil guide portion fixed to the housing on the inner diameter side of the crown gear, and the lubricating oil guide portion has the pinion gear side horizontal when viewed from the rotation axis direction of the crown gear The power transmission device has an upper surface portion which is disposed inclined in a lower direction with respect to the opposite side of the direction, deflects the lubricating oil dripping from above and guides it to the meshing portion side, and the power transmission device includes the crown gear. A differential mechanism is provided on the side opposite to the tooth side, and the upper surface portion is formed in a differential case that accommodates the differential mechanism by deflecting a portion of the lubricating oil that drips from above, thereby causing the lubricating oil to flow into the differential. This lubricating structure of a power transmission device is characterized by guiding to an opening side leading to a mechanism .
According to each of these inventions, part of the lubricating oil dripping from other components above the meshing portion is deflected by the upper surface of the lubricating oil guide portion, and the crown gear and the pinion gear are separated from the inner diameter side of the crown gear. It can be supplied to the meshing portion to improve the lubricating state of the meshing portion.
In addition, part of the lubricating oil dripping from other parts above the meshing point is deflected by the upper surface of the lubricating oil guide portion, guided from the tooth portion side of the crown gear to the differential mechanism side, and transferred to the differential mechanism. can be supplied to improve the lubrication of the differential mechanism.

The invention according to claim 7 is characterized by a crown gear formed in an annular shape that rotates about a first rotation axis with respect to the housing and is concentric with the first rotation axis, and a crown gear that rotates with respect to the housing. a pinion gear that rotates about a second rotation axis that intersects or is twisted with the rotation axis of and meshes with the crown gear; and a differential mechanism that is attached to the opposite side of the crown gear In the lubricating structure of a power transmission device, a lubricating oil guide portion fixed to the housing is provided on the inner diameter side of the crown gear, and the lubricating oil guide portion receives lubricating oil dripping from above. The lubricating structure for a power transmission device is characterized in that it has an upper surface portion that is deflected and guided to an opening side that is formed in a differential case that accommodates the differential mechanism and that introduces lubricating oil into the differential mechanism.
According to this , part of the lubricating oil dripping from the other parts above the meshing part is deflected by the upper surface part of the lubricating oil guide part and guided from the tooth part side of the crown gear to the differential mechanism side, It can be supplied to the differential mechanism to improve the lubrication condition of the differential mechanism.
According to an eighth aspect of the invention, the upper surface portion is inclined in a direction in which the differential mechanism side is lower than the tooth side when viewed from the horizontal direction along the radial direction of the crown gear. A lubricating structure for a power transmission device according to any one of claims 5 to 7 .
According to this, the effect of deflecting the lubricating oil dripping from above and guiding it to the differential mechanism side can be accelerated, and the above-described effect can be obtained more reliably.

According to a ninth aspect of the invention, a baffle portion provided to cover a lower portion of the crown gear is provided, and the lubricating oil guide portion is integrally formed with the baffle portion. A lubricating structure for a power transmission device according to any one of items up to item 8 .
According to this, in the power transmission device in which the crown gear is provided with the baffle, it is possible to apply the present invention without increasing the number of parts, and the provision of the baffle reduces the amount of lubricating oil that the crown gear scoops up. Even in such a case, the lubricating state of the power transmission device can be improved by effectively using a small amount of lubricating oil droplets.

As described above, according to the present invention, it is possible to provide a lubricating structure for a power transmission device that can ensure lubricating performance with a small amount of lubricating oil.

1 is a schematic cross-sectional view of a transmission having a first embodiment of a lubricating structure for a power transmission device to which the present invention is applied; FIG. 2 is a perspective view around a hypoid gear in the transmission of the first embodiment; FIG. 3 is a schematic diagram of the vicinity of a hypoid gear in the transmission of the first embodiment, viewed from the axial direction of the crown gear; 4 is a schematic cross-sectional view along line IV-IV in FIG. 3, etc. FIG. FIG. 10 is a perspective view of the vicinity of a hypoid gear in a transmission having a second embodiment of a lubricating structure for a power transmission device to which the present invention is applied; FIG. 11 is a schematic diagram of the periphery of a hypoid gear in the transmission of the second embodiment, viewed from the axial direction of the crown gear; 7 is a schematic cross-sectional view along line VII-VII in FIG. 6, etc. FIG. FIG. 11 is a perspective view of the vicinity of a hypoid gear in a transmission having a third embodiment of a lubricating structure for a power transmission device to which the present invention is applied; FIG. 11 is a schematic diagram of the periphery of a hypoid gear in a transmission of a third embodiment, viewed from the axial direction of a crown gear; 10A and 10B are schematic cross-sectional views taken along line XX of FIG. 9, and the like. FIG. 11 is a perspective view of the periphery of a hypoid gear in a transmission having a fourth embodiment of a lubricating structure for a power transmission device to which the present invention is applied; FIG. 11 is a schematic diagram of the periphery of a hypoid gear in a transmission of a fourth embodiment, viewed from the axial direction of a crown gear; FIG. 13 is a schematic cross-sectional view taken along line XIII-XIII of FIG. 12;

<First Embodiment>
A first embodiment of a lubricating structure for a power transmission device to which the present invention is applied will be described below.
The lubricating structure of the power transmission device according to the first embodiment is provided, for example, in a transmission that is mounted in an automobile such as a passenger car and that changes the rotation output of an engine that is a power source for running the vehicle.
In the first embodiment, the transmission is, for example, a chain-type continuously variable transmission (CVT).

FIG. 1 is a schematic cross-sectional view of the transmission according to the first embodiment, showing a state seen from the side of the vehicle.
FIG. 2 is a perspective view around a hypoid gear in the transmission of the first embodiment.
In the first embodiment, the engine has a so-called vertical layout in which the crankshaft is mounted along the longitudinal direction of the vehicle.
The transmission 1 includes a torque converter 20, a forward/reverse switching mechanism 30, a primary pulley 40, a secondary pulley 50, a chain 60, and a transmission case 10 which is formed, for example, by subjecting a casting of an aluminum alloy to a predetermined machining process. , a pinion shaft 70, a crown gear 80, a front differential 90, a transfer clutch 100, a control valve 110, a baffle 200 and the like.
A front portion of the transmission case 10 is formed with a differential housing 11 that accommodates a final reduction gear including a pinion gear 72, a crown gear 80, a front differential 90, and the like.
Lubricating oil is stored in the lower part of the differential housing 11 up to a predetermined oil level.
The oil surface height of the lubricating oil is set to such an extent that the lower portion of the crown gear 80 is immersed.

The torque converter 20 is a fluid coupling to which an output shaft of an engine (not shown) is connected, and functions as a starting device that enables the vehicle to start from a zero vehicle speed state.
The torque converter 20 has a stator connected to the input shaft, a turbine connected to the output shaft, a stator provided between them and fixed to the transmission case 10, and the like.
The torque converter 20 has a lock-up clutch that restricts the relative rotation between the impeller and the turbine under certain operating conditions.
The engagement force of the lockup clutch is controlled by a transmission control unit (not shown).
An output shaft 21 of the torque converter 20 is connected to a forward/reverse switching mechanism 30 .

The forward/reverse switching mechanism 30 reverses the output rotation of the torque converter 20 to enable the vehicle to travel backward.
The forward/reverse switching mechanism 30 directly connects the output shaft 21 of the torque converter 20 and the input shaft of the primary pulley 40 to directly transmit the rotation of the output shaft 21 to the primary pulley 40 when moving forward.
When the vehicle moves backward, the forward/reverse switching mechanism 30 reverses the direction of rotation of the output shaft 21 and transmits it to the primary pulley 40, thereby reversing the direction of rotation after the primary pulley 40, thereby switching the vehicle between forward and reverse. .
The forward/reverse switching mechanism 30 includes a planetary gear mechanism incorporating a plurality of planetary gears supported by a planetary carrier between a concentrically arranged sun gear and an internal gear.
The sun gear and the internal gear are connected to an input shaft and an output shaft of the forward/reverse switching mechanism 30, respectively.
In the forward/reverse switching mechanism 30, rotation of the planetary gears is restrained during forward travel, and the sun gear and the internal gear rotate in the same direction at the same angular velocity.
At this time, the planetary gear also revolves at the same rotational speed as the sun gear and the like.
Further, when the vehicle is traveling in reverse, the sun gear and the internal gear rotate in opposite directions due to the rotation of the planetary gears.

The primary pulley 40 , the secondary pulley 50 and the chain 60 cooperate to form a transmission mechanism (variator) of the transmission 1 .
The primary pulley 40 and the secondary pulley 50 are each rotatable around rotation center axes arranged in parallel.
The primary pulley 40 and secondary pulley 50 each have a fixed sheave and a movable sheave that sandwich the chain 60 .

The chain 60 is wound between the primary pulley 40 and the secondary pulley 50 to transmit power therebetween.
The chain 60 is configured by connecting a plurality of rocker pins sandwiched between sheaves by link plates.
The primary pulley 40 and the secondary pulley 50 can steplessly change the interval between the fixed sheave and the movable sheave according to control by a transmission control unit (not shown), and the chain 60 is wound thereon. Speed can be changed by changing the effective diameter.

The rotation center axis of the primary pulley 40 is arranged coaxially with the rotation center axes of the crankshaft of the engine, the torque converter 20 , and the sun gear of the forward/reverse switching mechanism 30 .
The rotation center axis of primary pulley 40 is arranged along the front-rear direction of the vehicle.
The rotation center axis of secondary pulley 50 is arranged below the rotation center axis of primary pulley 40 .

A reduction drive gear 52 that drives the pinion shaft 70 is provided on the output shaft 51 of the secondary pulley 50 .
The pinion shaft 70 is a rotating shaft arranged parallel to the central axis of rotation of the secondary pulley 50 .
The pinion shaft 70 is provided with a reduction driven gear 71 , a pinion gear 72 and a transfer drive gear 73 .

The reduction driven gear 71 meshes with the reduction drive gear 52 of the secondary pulley 50, and power is transmitted from the secondary pulley 50 while reducing the rotation speed.
A reduction driven gear 71 is provided at an intermediate portion of the pinion shaft 70 .
The pinion gear 72 meshes with the crown gear 80 to drive it.
The pinion gear 72 is provided at the front end (the end on the engine side) of the pinion shaft 70 .
The transfer drive gear 73 meshes with a transfer driven gear 92 provided on the input shaft 101 of the transfer clutch 100 to transmit power to the transfer clutch 100 .
A transfer drive gear 73 is provided at the rear end of the pinion shaft 70 .

The crown gear 80 is an annular gear arranged with its central axis of rotation along the vehicle width direction.
Teeth that mesh with the teeth of the pinion gear 72 are arranged in the circumferential direction on one surface of the crown gear 80 in the axial direction.
The side on which teeth are formed in the axial direction of the crown gear 80 is hereinafter referred to as a tooth side portion 81 for explanation.

Crown gear 80 is driven by pinion gear 72 of pinion shaft 70 .
The rotation center axis of the crown gear 80 is perpendicular to the rotation center axis of the pinion shaft 70 when viewed from above, and is arranged at a position lower than the rotation center axis of the pinion shaft 70 when viewed from the vehicle width direction, which is a so-called twisted position. in a relationship.
The crown gear 80 and the pinion gear 72 constitute a hypoid gear (intersecting shaft gear) that serves as a final reduction gear for the front wheels.

The crown gear 80 and the pinion gear 72 are spiral bevel gears having a predetermined helix angle.
In the first embodiment, for example, as shown in FIG. 2, the crown gear 80 is twisted to the right and the pinion gear 72 is twisted to the left.
A front differential 90 is attached to the side of the crown gear 80 opposite to the tooth side portion 81 side.
An opening 82 in the center of the crown gear 80 is inserted with a shaft portion (not shown) that transmits power from the front differential 90 to the right front wheel. It also functions as a road.

The front differential 90 is a differential mechanism that transmits the power input from the crown gear 80 to the left and right front wheels and also allows a rotational speed difference between the left and right front wheels when turning.
The front differential 90 includes, for example, a pair of left and right side gears to which the left and right drive shafts are connected, and a pinion gear that has a rotation shaft fixed to the crown gear 80 and meshes with the left and right side gears. be done.
For example, when there is no rotational speed difference between the left and right front wheels, such as when the vehicle is traveling straight ahead, the pinion gear does not rotate, and the left and right side gears rotate integrally with the crown gear 80 without relative rotation.
On the other hand, when there is a difference in rotational speed between the left and right front wheels, such as when turning, the pinion gear rotates, causing a difference in rotational speed between the left and right side gears, allowing the difference in rotational speed between the left and right front wheels. there is

A portion of the differential case C of the front differential 90 exposed in the opening 82 of the crown gear 80 is formed with an opening 91 through which lubricating oil can be introduced into the differential case C from the inside of the opening 82 .

The transfer clutch 100 transmits the driving force transmitted from the pinion shaft 70 to the rear wheels and adjusts the torque transmitted to the rear wheels.
The transfer clutch 100 includes, for example, a hydraulic wet multi-plate clutch, and its engagement force (transmission torque) is appropriately controlled by the transmission control unit according to the running state of the vehicle.
Transfer clutch 100 is arranged on the rear side of primary pulley 40 .
An input shaft 101 of the transfer clutch 100 protrudes forward from the transfer clutch 100 and is provided with a transfer driven gear 102 .
The output shaft 103 of the transfer clutch 100 protrudes rearward from the transfer clutch 100, and its rear end is connected to the front end of the propeller shaft P. As shown in FIG.
The propeller shaft P is a rotating shaft that transmits driving force to rear wheels via a pinion gear, crown gear, rear differential, and rear drive shaft (not shown) provided at the rear of the vehicle body.

The control valve 110 supplies oil (CVT fluid) pressurized and supplied by an oil pump (not shown) to each part in the transmission 1 according to commands from a transmission control unit (not shown).
Control valve 110 is arranged above output shaft 21 of torque converter 20 in transmission case 10 .

FIG. 3 is a schematic diagram of the periphery of the hypoid gear in the transmission of the first embodiment, viewed from the axial direction of the crown gear.
4 is a schematic cross-sectional view taken along line IV-IV in FIG. 3, and the like.
In FIG. 4, FIG. 4(a) is a schematic sectional view taken along line IV-IV in FIG. 3, and FIG. 4(b) is a sectional view taken along line bb in FIG. 4(a). . (Same in FIGS. 7, 10 and 13 described later)
The baffle 200 is a member provided inside the differential housing 11 to cover the lower portion of the crown gear 80 . Baffle 200 is fixed to differential housing 11 .
The baffle 200 has a side surface portion 210 and a peripheral surface portion 220 and is formed into a cup-shaped container with an upper opening.
One side portion 210 of the baffle 200 may extend along the axial direction of the crown gear 80 so as to cover the lower portion of the front differential 90 .

The side surface portion 210 is a surface portion arranged along a plane perpendicular to the rotation center axis of the crown gear 80 .
A side portion adjacent to the tooth side portion 81 of the crown gear 80 is arranged to face the tip of the crown gear 80 with a gap therebetween.

The peripheral surface portion 220 is a surface portion arranged along the outer peripheral edge portion of the crown gear 80 .
The peripheral surface portion 220 is curved in an arc shape when viewed from the rotation center axis direction of the crown gear 80 .
The inner surface of the peripheral surface portion 220 is arranged to face the outer peripheral surface of the crown gear 80 with a gap therebetween.
An opening is provided in the lower portion of the peripheral surface portion 220 to allow lubricating oil to flow into the inside of the baffle 200 from other portions within the differential housing 11 .

By providing the baffle 200, in the area outside the baffle 200 inside the differential housing 11, the disturbance of the lubricating oil caused by the crown gear 80 is suppressed, so that the lubricating oil is stirred when the crown gear 80 rotates. Loss can be suppressed.
However, in order to reduce the stirring loss, if the baffle 200 is provided in this way or the amount of oil (oil level) in the differential housing 11 is reduced, the amount of lubricating oil that is scooped up when the crown gear 80 rotates is reduced. There is concern that the amount of droplets will decrease and the lubrication conditions at the meshing point M of the hypoid gear will become severe.
Therefore, in the first embodiment, the baffle 200 is provided with a lubricating oil guide portion 300, which will be described below, so as to improve the lubricating state of the meshing portion M even with a relatively small amount of lubricating oil splash.
The baffle 200 and the lubricating oil guide portion 300 are integrally formed by, for example, injection molding a resin material.

The lubricating oil guide portion 300 has a body portion 310 and a stay portion 320 .
The body portion 310 contains lubricating oil that is scooped up from the inside of the baffle 200 when the crown gear 80 rotates (when the vehicle is running), and lubricating oil that drips from other parts arranged above the ceiling of the differential housing 11. is deflected toward the vehicle rear side (pinion gear 72 side), and the inner peripheral edge of the tooth side portion 81 of the crown gear 80 and the tip portion of the pinion gear 72 (the end on the inner diameter side of the crown gear 80) start to bite. It is guided to the vicinity of the point and introduced to the meshing point M from here.
The stay portion 320 is formed to protrude upward from the upper edge portion of the side portion 220 on the side adjacent to the tooth side portion 81 of the crown gear 80 .
The body portion 310 protrudes from the upper end portion of the stay portion 320 toward the front differential 90 along the rotation center axis direction of the crown gear 80 .

As shown in FIG. 4B and the like, the body portion 310 has an upper surface portion 311 and a lower surface portion 312 .
The upper surface part 311 is provided on the upper part of the main body part 310, for example, when the crown gear 80 rotates, it scatters due to centrifugal force, and adheres to other parts arranged above such as the ceiling part of the differential housing 11. Lubrication that drips after It is a face portion that deflects oil toward the rear side of the vehicle and introduces it to the vicinity of the meshing portion.
The upper surface portion 311 has the pinion gear 72 side (the outer diameter side of the crown gear 80, the vehicle rear side in the first embodiment) when viewed from the rotation axis direction of the crown gear 80, and the opposite side in the horizontal direction (first In the embodiment, it is formed in a planar shape that is inclined in a direction that is lower than the front side of the vehicle.

The lower surface portion 312 is provided at the lower portion of the main body portion 310. For example, when the crown gear 80 rotates, the teeth of the crown gear 80 splash the lubricating oil from inside the baffle 200. It is a surface part to be introduced in the vicinity.
The lower surface portion 312 is formed in a flat plate shape in which the pinion gear 72 side is inclined in a direction higher than the opposite side in the horizontal direction when viewed from the rotation axis direction of the crown gear 80 .

As shown in FIG. 4B, the cross-sectional shape of the main body portion 310 of the lubricating oil guide portion 300 taken along a plane orthogonal to the axial direction of the crown gear 80 is such that the surfaces of the upper surface portion 311 and the lower surface portion 312 are It is formed in a triangular shape with two sides.
Edges of the upper surface portion 311 and the lower surface portion 312 on the side of the pinion gear 72 are connected to each other, and a sharp edge portion is formed at the boundary between them.

The operation of the lubricating structure of the power transmission device of the first embodiment will be described below.
When the vehicle moves forward, the pinion gear 72 rotates counterclockwise when viewed from the front side of the vehicle.
Accordingly, the crown gear 80 rotates in the same forward direction as the front wheels, that is, clockwise when viewed from the right side of the vehicle as shown in FIGS.
At this time, the contact position between the tooth surface of the pinion gear 72 and the tooth surface of the crown gear 80 moves from the inner diameter side of the crown gear 80 to the outer diameter side.

The lower portion of crown gear 80 is immersed in lubricating oil (differential gear oil) that flows into baffle 200 from a lubricating oil reservoir provided in the lower portion of differential housing 11 and is stored inside baffle 200 .
A region of the crown gear 80 on the rear side of the vehicle stirs up the lubricating oil in the baffle 200 as droplets and raises it during rotation.
A portion of the rising lubricating oil O1 collides with the lower surface portion 312 of the main body portion 310 of the lubricating oil guide portion 300 during the rise and is deflected toward the vehicle rear side, whereupon the pinion gear 72 and the crown gear 80 are engaged with each other at the meshing point M. introduced into
Further, the crown gear 80 causes the lubricating oil to scatter in the radial direction due to centrifugal force during rotation, and a part of the lubricating oil adheres to the ceiling of the differential housing 11 and the like.
A portion of the lubricating oil O2 dripping from the ceiling portion of the differential housing 11 collides with the upper surface portion 311 of the main body portion 310 of the lubricating oil guide portion 300 during descent, and is deflected toward the rear side of the vehicle to move the pinion gear 72 and the crown. It is introduced to the meshing point M with the gear 80 .
When moving forward, the crown gear 80 sequentially bites from the teeth on the lower side of the pinion gear 72, so the height at which lubricating oil is supplied to the crown gear 80 (the height of the rear end of the upper surface portion 311 and the lower surface portion 312) ) is preferably offset downward with respect to the axis of the pinion gear 72 .

As described above, according to the first embodiment, part of the lubricating oil O1 scooped up by the crown gear 80 is deflected by the lower surface portion 312 of the main body portion 310 of the lubricating oil guide portion 300, It can be supplied to the meshing point M between the crown gear 80 and the pinion gear 72 from the inner diameter side.
In addition, part of the lubricating oil O2 that drips from the ceiling of the differential housing 11, the upper part of the crown gear 80, and other parts arranged above the meshing point M is removed from the main body 310 of the lubricating oil guide part 300. It can be deflected by the upper surface portion 311 and supplied to the meshing portion M between the crown gear 80 and the pinion gear 72 from the inner diameter side of the crown gear 80 .
In a hypoid gear like this embodiment, lubricating oil supplied to one end of the meshing portion M flows along the tooth flanks of each gear along the tooth flanks of each gear as the tooth flanks slide during rotation. Since it is transported, a small amount of lubricating oil can effectively lubricate the entire tooth flank.
As a result, it is possible to improve transmission efficiency and prevent problems such as seizure, thereby improving reliability.

<Second embodiment>
Next, a second embodiment of a lubricating structure for a power transmission device to which the present invention is applied will be described.
In each embodiment described below, the same reference numerals are assigned to the same parts as in the previous embodiment, and description thereof is omitted, and differences are mainly described.
FIG. 5 is a perspective view around a hypoid gear in the transmission of the second embodiment.
FIG. 6 is a schematic diagram of the periphery of the hypoid gear in the transmission of the second embodiment, viewed from the axial direction of the crown gear.
FIG. 7 is a schematic cross-sectional view along line VII-VII in FIG. 6, and the like.

In the second embodiment, the height of the upper surface portion 311 of the main body portion 310 of the lubricating oil guide portion 300 is increased compared to the first embodiment, and the rear end portion of the upper surface portion 311 (the end portion on the pinion gear 72 side) is , the lubricating oil O2 can be introduced above the meshing point M between the pinion gear 72 and the crown gear 80 .
As a result, as shown in FIG. 7B, the cross-sectional shape of the body portion 310 of the lubricating oil guide portion 300 is, for example, trapezoidal.

According to the second embodiment described above, in addition to the same effects as those of the first embodiment described above, the lubricating oil O2 dripping from above is applied to the engagement portion M, which is the engagement side when the vehicle moves backward. It is possible to supply the lubricant to the upper side, and it is possible to improve the lubricating state of the hypoid gear during reverse movement.

<Third Embodiment>
Next, a third embodiment of a lubricating structure for a power transmission device to which the present invention is applied will be described.
FIG. 8 is a perspective view around a hypoid gear in the transmission of the third embodiment.
FIG. 9 is a schematic diagram of the vicinity of the hypoid gear in the transmission of the third embodiment, viewed from the axial direction of the crown gear.
FIG. 10 is a schematic cross-sectional view taken along line XX of FIG. 9, and the like.

In the third embodiment, the body portion 310 of the lubricating oil guide portion 300 having the same cross-sectional shape as that of the first embodiment is extended toward the front differential 90, and part of the lubricating oil is introduced through the opening 91 of the differential case C. can be supplied to the inside of the front differential 90.
As shown in FIG. 10( a ), the main body portion 310 , the upper surface portion 311 , and the lower surface portion 312 are positioned closer to the front differential 90 than the stay portion 320 when viewed from the radial and horizontal directions of the crown gear 80 . It is slanted so that the part becomes higher.

According to the third embodiment described above, part of the lubricating oil O1 that is splashed up by the crown gear 80 and collides with the lower surface portion 312 of the main body portion 310 moves toward the front differential 90 (the left side in the vehicle width direction). .

<Fourth Embodiment>
Next, a fourth embodiment of a lubricating structure for a power transmission device to which the present invention is applied will be described.
FIG. 11 is a perspective view around a hypoid gear in the transmission of the fourth embodiment.
FIG. 12 is a schematic diagram of the periphery of the hypoid gear in the transmission of the fourth embodiment, viewed from the axial direction of the crown gear.
FIG. 13 is a schematic cross-sectional view taken along line XIII-XIII of FIG. 12, and the like.
In FIG. 13, FIG. 13(c) is a cross-sectional view taken along line cc in FIG. 13(a).

In the fourth embodiment, the cross-sectional shape of the body portion 310 of the lubricating oil guide portion 300 is trapezoidal at the end on the pinion gear 72 side as in the second embodiment, and at the end on the front differential 90 side. , are triangular like those in the first embodiment.
As a result, as shown in FIG. 13( a ), the upper surface portion 311 of the main body portion 310 is inclined with respect to the stay portion 320 side so that the front differential 90 side is lower.
On the other hand, the lower surface portion 312 is inclined so that the front differential 90 side is higher than the stay portion 320 side.

In the fourth embodiment described above, in addition to the same effects as those of the third embodiment described above, the upper surface portion 311 of the main body portion 310 of the lubricating oil guide portion 300 is positioned on the tooth side portion 81 side of the crown gear 80. As a result, part of the lubricating oil O2 dripping from the ceiling of the differential housing 11 is guided to the differential case C side of the front differential 90, and an opening 91 is formed inside the front differential 90. , the lubrication condition of the differential mechanism of the front differential 90 can be further improved.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The transmission including the power transmission device and the shape, structure, material, manufacturing method, arrangement, number, etc. of each member constituting the lubricating structure of the power transmission device are not limited to the above-described embodiments, and may be used as appropriate. can be changed.
(2) Each of the above-described embodiments was used, for example, in a front-wheel differential mechanism of a vehicle having a longitudinally mounted transmission, but the present invention is not limited to this. It can also be used to lubricate the differential mechanism provided in the rear wheel final reduction gear.
(3) In each embodiment, the lubricating oil guide portion is provided in the baffle provided covering the lower portion of the crown gear, but the lubricating oil guide portion may be attached to another part that does not rotate when the vehicle is running. good. For example, it may be configured to protrude from the wall surface of the housing in which the final reduction gear is accommodated.
The present invention can also be applied to a power transmission device that does not have a baffle. Effective in improving condition.
(4) In each of the embodiments, the differential mechanism was configured by side gears, pinion gears, etc., as an example, but the present invention uses, for example, a worm gear, etc., for a differential mechanism having a torque sensing type differential limiting function. It can also be applied to the lubrication of other types of differential mechanisms, such as mechanisms.
(5) Each embodiment relates to a hypoid gear in which the rotation center axis of the pinion gear and the rotation center axis of the crown gear are twisted, but the present invention is not limited to this, and the rotation of the pinion gear It can also be applied to a spiral bevel gear in which the center axis and the rotation center axis of the crown gear intersect.

1 transmission 10 transmission case 11 differential housing 20 torque converter 21 output shaft 30 forward/reverse switching mechanism 40 primary pulley 50 secondary pulley 51 output shaft 52 reduction drive gear 60 chain 70 pinion shaft 71 reduction driven gear 72 pinion gear 73 transfer drive gear 80 crown gear 81 tooth side portion 82 opening 90 front differential C differential case 91 opening 100 transfer clutch 101 input shaft 102 transfer driven gear 103 output shaft 110 control valve P propeller shaft 200 baffle 210 side surface portion 220 peripheral surface portion 300 lubricating oil guide portion 310 body portion 311 upper surface portion 312 lower surface portion 320 stay portion O1, O2 lubricating oil M meshing portion

Claims (9)

a crown gear formed in an annular shape that rotates about a first rotation axis with respect to the housing and is concentric with the first rotation axis;
A lubrication structure for a power transmission device, comprising: a pinion gear that rotates about a second rotation shaft that is arranged to intersect or twist with the first rotation shaft with respect to the housing and that meshes with the crown gear,
Having a lubricating oil guide part fixed to the housing on the inner diameter side of the crown gear in the vicinity of the meshing point with the pinion gear,
The lubricating oil guide part is arranged so that the pinion gear side is higher than the opposite side in the horizontal direction when viewed from the rotating shaft direction of the crown gear, and the lubricating oil that the crown gear scoops up from below. has a lower surface portion that deflects and guides to the meshing portion side,
The power transmission device comprises a differential mechanism attached to the side opposite to the tooth side of the crown gear,
The lower surface portion deflects a portion of the lubricating oil scooped up by the crown gear from below and guides it to an opening side formed in a differential case housing the differential mechanism and introducing the lubricating oil into the differential mechanism.
A lubrication structure for a power transmission device, characterized by: a crown gear formed in an annular shape that rotates about a first rotation axis with respect to the housing and is concentric with the first rotation axis;
a pinion gear that rotates about a second rotation axis that is arranged to intersect or twist with the first rotation axis with respect to the housing and that meshes with the crown gear;
A lubricating structure for a power transmission device comprising: a differential mechanism mounted on the side opposite to the tooth side of the crown gear,
Having a lubricating oil guide part fixed to the housing on the inner diameter side of the crown gear,
The lubricating oil guide portion is formed in a differential case accommodating the differential mechanism and deflects the lubricating oil scooped up by the crown gear from below, and guides the lubricating oil to an opening side for introducing the lubricating oil into the differential mechanism. A lubricating structure for a power transmission device, comprising: The lower surface portion is inclined in a direction in which the differential mechanism side is higher than the tooth side when viewed from the horizontal direction along the radial direction of the crown gear. 3. A lubricating structure for a power transmission device according to item 2 . The lubricating oil guide part is arranged so that the pinion gear side is lower than the opposite side in the horizontal direction when viewed from the rotation axis direction of the crown gear, and deflects the lubricating oil dripping from above. The lubricating structure for a power transmission device according to any one of claims 1 to 3 , further comprising an upper surface portion that guides the lubricating portion toward the meshing portion. The power transmission device comprises a differential mechanism attached to the side opposite to the tooth side of the crown gear,
The upper surface portion is formed in a differential case that accommodates the differential mechanism by deflecting a portion of the lubricating oil dripping from above, and guides the lubricating oil to an opening side that introduces the lubricating oil into the differential mechanism.
A lubricating structure for a power transmission device according to claim 4, characterized in that: a crown gear formed in an annular shape that rotates about a first rotation axis with respect to the housing and is concentric with the first rotation axis;
A lubrication structure for a power transmission device, comprising: a pinion gear that rotates about a second rotation shaft that is arranged to intersect or twist with the first rotation shaft with respect to the housing and that meshes with the crown gear,
Having a lubricating oil guide part fixed to the housing on the inner diameter side of the crown gear in the vicinity of the meshing point with the pinion gear,
The lubricating oil guide part is arranged so that the pinion gear side is lower than the opposite side in the horizontal direction when viewed from the rotation axis direction of the crown gear, and deflects the lubricating oil dripping from above. Having an upper surface portion that guides to the meshing portion side,
The power transmission device comprises a differential mechanism attached to the side opposite to the tooth side of the crown gear,
The upper surface portion is formed in a differential case that accommodates the differential mechanism by deflecting a portion of the lubricating oil dripping from above, and guides the lubricating oil to an opening side that introduces the lubricating oil into the differential mechanism.
A lubrication structure for a power transmission device, characterized by: a crown gear formed in an annular shape that rotates about a first rotation axis with respect to the housing and is concentric with the first rotation axis;
a pinion gear that rotates about a second rotation axis that is arranged to intersect or twist with the first rotation axis with respect to the housing and that meshes with the crown gear;
A lubricating structure for a power transmission device comprising: a differential mechanism mounted on the side opposite to the tooth side of the crown gear,
Having a lubricating oil guide part fixed to the housing on the inner diameter side of the crown gear,
The lubricating oil guide part has an upper surface part that deflects lubricating oil dripping from above and guides it to an opening side formed in a differential case that houses the differential mechanism and introducing the lubricating oil to the differential mechanism. Lubrication structure of the power transmission device. The upper surface portion is inclined in a direction in which the differential mechanism side is lower than the tooth side when viewed from the horizontal direction along the radial direction of the crown gear. 8. A lubricating structure for a power transmission device according to any one of items 7 to 7 . A baffle part provided covering the lower part of the crown gear,
The lubricating structure for a power transmission device according to any one of claims 1 to 8 , wherein the lubricating oil guide portion is formed integrally with the baffle portion.

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