JP2002228089A - Lubricating oil passage structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently feed oil to a lubrication part far away from an oil feeding position. SOLUTION: In a lubricating oil passage structure in which oil is introduced in a main oil hole 51 made in the center of a rotary shaft 2 through an inlet hole 60, and oil in the main oil hole is fed outside through a plurality of outlet holes 52a, 52b and 52c at the different distances in one direction from the inlet hole 60, an oil feed pipe OP is inserted in the main oil hole, and the oil introduced from the inlet hole is preferentially led to the predetermined outlet hole 52c far away by at least two holes from the inlet hole side through the oil feed pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lubricating oil passage structure, and more particularly to a lubricating oil passage structure suitable for transfer of a four-wheel drive vehicle.

[0002]

2. Description of the Related Art In a transfer (power distribution device) of a four-wheel drive vehicle, a two-wheel drive / four-wheel drive switching device or a high
There are various lubricating parts such as low (Hi-Lo) switching devices.
An oil pump is provided on the main shaft to lubricate them, and oil discharged from the oil pump is sequentially supplied to each lubricating unit through a passage in the main shaft.

[0003]

However, since oil is supplied to each lubricating portion in order from the oil pump side, the oil amount becomes smaller as the oil pump is farther or downstream from the oil pump. Therefore, if there is an important lubricating part in a distant place, lubrication cannot be performed sufficiently, which may cause poor lubrication.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a lubricating oil passage structure that can sufficiently supply oil to a lubricating portion far from an oil supply position.

[0005]

SUMMARY OF THE INVENTION According to the present invention, oil is introduced into a main oil hole provided at the center of a rotating shaft through an inlet hole, and a plurality of oils are provided at different distances from the inlet hole in one direction. In the lubricating oil passage structure for supplying the oil in the main oil hole to the outside through the outlet hole, an oil supply pipe is inserted and arranged in the main oil hole, and the oil introduced from the inlet hole is passed through the oil supply pipe to the inlet hole side. Priority is given to two or more distant specific exit holes counted from

Here, the specific outlet hole may be an outlet hole furthest from the inlet hole.

It is preferable that the oil supply pipe forms an outer peripheral passage between the oil supply pipe and an inner wall of the main oil hole, and supplies oil to an outlet hole other than a specific outlet hole through the outer peripheral passage.

[0008] It is preferable that a flange portion that divides the outer peripheral passage in a circumferential direction is provided on an outer peripheral portion of the oil supply pipe.

[0009] A plurality of outlet holes other than the specific outlet hole may be provided at the same phase position of the main oil hole, and the flange portion may be spirally formed to supply oil to each outlet hole independently. .

[0010] It is preferable that the oil supply pipe has a pair of seal portions which partition both sides in the axial direction of the inlet hole in the main oil hole to define an inlet chamber, and a bridge portion connecting these seal portions.

It is preferable that a hole is provided in the bridge portion so as to enlarge the passage area of the passage from the inlet chamber to the inside of the oil supply pipe.

It is preferable that the bridge portion has a cross-shaped cross-section provided at the center of the pipe, and the hole is a substantially conical hole formed in the center of the bridge portion in a half-blank shape. .

It is preferable that the oil supply pipe is an integrally molded product made of a resin material.

[0014]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First, a four-wheel drive vehicle and a transfer to which the lubricating oil passage structure according to the present invention is applied will be described. As shown in FIG. 6, in the four-wheel drive vehicle, the power of the engine E is transmitted rearward to the transmission T / M and the transfer T / M.
After transmitting to the front wheel FW and the rear wheel RW, the four wheels are driven. As will become clear later, the drive of the front wheels FW is optional, and a so-called FR-based part-time 4WD configuration is employed. Engine E is installed vertically. The transmission T / M is of a manual type including a friction clutch or an automatic transmission type including a fluid converter.

FIG. 4 shows a transfer. The transfer T / F receives the power of the transmission T / M from the input shaft 1, outputs power from the rear output shaft 2 to the rear wheels, and selectively outputs power from the front output shaft 3 to the front wheels. . The rear output shaft 2 and the front output shaft 3 are connected by a distribution device 4 composed of a chain and sprocket mechanism, and power is distributed and transmitted to each shaft. The power distribution to the front output shaft 3 is selectively performed by the selection device 5. This is the same configuration as the transmission mechanism in a normal manual transmission. A two-wheel drive / four-wheel drive switching device is realized by the distribution device 4 and the selection device 5.

In order to perform Hi-Lo two-stage switching of the entire transfer, an auxiliary transmission 6 comprising a planetary gear mechanism is provided. The auxiliary transmission 6 is provided on the input side of the two-wheel drive / four-wheel drive switching device.
The reduction ratio becomes a larger value (for example, 2.5).
The rotation of is reduced and transmitted to the output side. The auxiliary transmission 6 also has a neutral (N) position. The entirety of the input shaft 1 to the sub-transmission 6 is housed in a common transfer casing 7.

Near the front end of the transfer T / F,
The input shaft 1 and the rear output shaft 2 are fitted and connected coaxially and are relatively rotatable relative to each other. The input shaft 1 and the rear output shaft 2 form the main shaft of the entire transfer. Needle bearings 8 are provided at the connecting portions. The input shaft 1 is hollow, the front end of which protrudes from the casing 7, and a spline 9 is formed on the inner periphery so that a transmission output shaft (not shown) can be spline-fitted. . The input shaft 1 is also supported from the outer peripheral side by a front bearing 11 composed of a ball bearing via a needle bearing 10 and a carrier bearing 30a. As a result, the input shaft 1 is supported from the inner and outer peripheral sides by the needle bearing 8 and the front bearing 11. A gap between the input shaft 1 and the casing 7 is sealed by an oil seal 12.

The rear output shaft 2 extends substantially over the entire length of the transfer, and is supported at its rear end by a rear bearing 13 composed of a ball bearing. The rear end protrudes from the casing 7 (not shown) so that a rear wheel drive shaft (propeller shaft) S / R can be connected as shown in FIG.

The distribution device 4 is provided at a substantially intermediate position of the rear output shaft 2 and is relatively rotatably mounted on the outer peripheral side of the rear output shaft 2 via a needle bearing 14a. It comprises a driven sprocket (driven member) 15 fixed to the output shaft 3 and a chain 16 connecting these sprockets. The front output shaft 3 forms a sub-shaft of the entire transfer. The front side is supported by a ball bearing 17 at the front side, the needle bearing 18 at the rear end, and the front end protrudes from the casing 7. A flange 19 is fastened to the protruding portion by a nut 21 so that a front wheel drive shaft S / F can be connected using a bolt 20 as shown in FIG. The gap between the protrusion and the casing 7 is sealed by the oil seal 22.

Here, as shown in FIG.
/ F is inclined not obliquely but vertically in front view. The front output shaft 3 is disposed diagonally below the input shaft 1 and the rear output shaft 2, and their positions are offset in the left-right direction. This prevents interference between the engine E or the transmission T / M and the front wheel drive shaft S / F as shown in FIG.

The selecting device 5 is provided in front of and adjacent to the driving sprocket 14. The selection device 5 includes a dog gear 23 provided on the drive sprocket 14, a clutch hub 24 fixedly provided on the rear output shaft 2, and a selection sleeve 25 spline-fitted to the outer peripheral portion of the clutch hub 24 so as to be axially slidable. And a synchronizer ring 26 provided between the dog gear 23 and the clutch hub 24. The illustrated state is a two-wheel drive (neutral) state. When the selection sleeve 25 is slid backward from this state, the selection sleeve 25 is synchronized by the synchronizer ring 26,
Meshes with the dog gear 23. As a result, the clutch hub 24 and the dog gear 23, and furthermore, the rear output shaft 2 and the driving sprocket 14 are connected, and the rotational power of the rear output shaft 2 is distributed and transmitted to the front output shaft 3 to be in a four-wheel drive state.

The auxiliary transmission 6 is provided in front of the selection device 5 and near the connection between the input shaft 1 and the rear output shaft 2. The auxiliary transmission 6 is of a planetary gear type, and includes a sun gear 27 provided integrally with the input shaft 1, a plurality of planetary gears 28 meshed with an outer peripheral portion of the sun gear 27, and each planetary gear 28.
And a ring gear 31 having an inner peripheral gear meshed with each planetary gear 28. The carrier 30 is provided with a bridge 32 at a circumferential position where there is no planetary gear 28, and also goes around the sun gear 27 and the planetary gear 28 to support the shaft 29 at both ends. The above-described carrier bearing portion 11 is a part of the carrier 30, projects forward from the carrier 30, and is supported between the needle bearing 10 and the front bearing 11. A needle bearing 33 for thrust is provided to reduce a thrust load between the sun gear 27 and the carrier 30.

The ring gear 31 is loosely spline-fitted to the casing 7 and is slightly eccentrically movable. This is a so-called floating support structure. And the ring gear 31
A damper ring 58 is provided for buffering a direct collision between the casing and the casing 7. The ring gear 31 is connected to the casing 7
Is inserted from the rear into a ring gear fitting hole 56 provided at the, and the axial position is fixed by a snap ring 57. A damper ring 58 is inserted into the front end of the ring gear fitting hole 56 in advance, and thereafter the ring gear 31 is inserted into the ring gear 3.
1 is pressed into the damper ring 58,
A damper ring 58 is inserted between the ring gear 31 and the ring gear fitting hole 56.

A hollow portion is provided radially inside the sun gear 27 and the carrier 30, and a switching sleeve 34 is provided slidably on the rear output shaft 2 there. Rear output shaft 2
Is provided with a spline 35, and a sleeve 34 is spline-fitted to the spline 35 to allow the sleeve 34 to slide in the axial direction, thereby preventing rotation on the rear output shaft 2.

Splines 36, 37,... Are provided on the inner peripheral portion of the sun gear 27 and the carrier 30 and on the outer peripheral portion of the switching sleeve 34.
38 are provided. Slide the switching sleeve 34,
By selectively meshing the spline 38 with one of the sun gear and the carrier splines 36 and 37,
Hi-Lo switching is performed. A neutral (N) position for disengaging the spline 38 of the switching sleeve 34 (free) is provided between the sun gear and the carrier splines 36 and 37. The auxiliary transmission or the switching mechanism is not provided with a synchro.

As shown in the figure, when the switching sleeve 34 is engaged with the sun gear 27, the input shaft 1 and the rear output shaft 2 are substantially directly connected, and the rotational power of the input shaft 1 is transmitted to the rear output shaft 2 as it is. . This is the Hi position. At this time, the planetary gear 28 rotates following the sun gear 27.

On the other hand, the switching sleeve 34 is slid backward from the state shown in FIG.
, The rotational power of the input shaft 1 is changed to the sun gear 27 →
Planetary gear 28 → carrier 30 → switching sleeve 34
→ The rear output shaft 2 is transmitted, and the rear output shaft 2 is rotated at a reduced speed with respect to the input shaft 1. This is Lo position.

In this transfer, switching between two-wheel drive and four-wheel drive by the selection device 5 and switching between Hi-N-Lo by the auxiliary transmission 6 are automatically performed by a common actuator 39. The actuator 39 has a motor 40 whose phase is controlled, and is stepwise rotated to a plurality of phase positions by the motor 40, and the selecting device 5 and the auxiliary transmission 6 are rotated.
A cylindrical cam 43 having two cam grooves 41 and 42 for switching the cam groove 41 and a selection arm 44 which engages with the cam groove 41 and the selection sleeve 25 to move the selection sleeve 25 in accordance with the rotation of the cam groove 41; , Cam groove 42 and switching sleeve 3
4 and the switching sleeve 3 according to the rotation of the cam groove 42.
Switching arm 45 for moving each arm 4 and each arm 4
And two shafts (only one shaft 46 is shown) for supporting the shafts 4 and 45 movably in the axial direction. Each of the arms 44 and 45 is provided with a shock absorber 48 using a spring (only one spring 47 is shown) so as not to apply an overload when the splines are engaged. A check mechanism 49 is provided for positioning with respect to each shaft.

A meter gear 54 is mounted on the rear output shaft 2 adjacent to the rear side of the rear bearing 13, and rotation of the meter gear 54 is detected by a rotation sensor (not shown) via a worm gear 55, and vehicle speed is detected.

Lubricating oil is stored in the bottom of the casing 7, but since this transfer is inclined as shown in FIG. 5, the oil is stored on the lower front output shaft 3 side, and the upper input shaft 1 and It is difficult to go to the rear output shaft 2 side.
Therefore, the upper parts are forcibly lubricated by the oil pump 49.

The oil pump 49 is provided on the rear output shaft 2 adjacent to the rear of the distributor 4 and is driven by the rear output shaft 2. Although the oil pump 49 of the present embodiment is a trochoid pump, it is not intended to be limited to this. The oil pump 49 sucks the oil stored in the bottom of the casing by a suction pipe 50 as shown by an arrow, and a main oil hole 51 provided coaxially at the center of the rear output shaft 2.
Then, the liquid is discharged through the inlet hole 60. The oil in the main oil hole 51 is supplied to the rotation support portion of the drive sprocket 14, the selection device 5, and the auxiliary transmission 6 through each outlet hole 52.
The front end of the main oil hole 51 is opened, from which oil is supplied to the needle bearing 8. A cap 53 is attached to the input shaft 1 near the front end of the rear output shaft 2 to prevent oil from leaking outside.

As shown in detail in FIG.
Is drilled from the front end of the rear output shaft 2 to the position of the rear bearing 13, and extends along the center of the rear output shaft 2. The inlet hole 60 and the outlet hole 52 are formed by piercing the rear output shaft 2 in the diametric direction by drilling, and are formed two by two with a phase angle of 180 ° in the outer peripheral meat portion of the main oil hole 51. It is formed. In front of the entrance hole 60, three exit holes having different axial distances from the entrance hole 60 are provided. These are a first exit hole 52a, a second exit hole 52b, and a third exit hole 52c in order from the entrance hole 60.

The first outlet hole 52a is provided at an axial position corresponding to the drive sprocket 14 of the distributor 4, and supplies oil to the needle bearing 14a in particular. Note that a metal bearing or the like may be used instead of the needle bearing 14a. The second outlet hole 52 b is provided at an axial position corresponding to the synchronizer ring 26 of the selection device 5, and particularly supplies oil to a friction surface of the synchronizer ring 26. The third outlet hole 52c is provided at an axial position corresponding to the front end position of the sun gear 27 of the auxiliary transmission 6. A circumferential groove 61 is formed on the outer peripheral portion of the rear output shaft 2 on the outlet side of the third outlet hole 52c,
The oil that has come out of the peripheral groove 61 from the third outlet hole 52c is supplied to the needle bearing 1 through the oil hole 62 of the input shaft 1.
0, oil is supplied to the thrust needle bearing 33 and the gear meshing portion, and also to the spline sliding portion and the gear meshing portion on the inner and outer circumferences of the switching sleeve 34 through the gap between the rear output shaft 2 and the sun gear 27.

One outlet hole 52, that is, a fourth outlet hole 52d is provided behind the inlet hole 60. This is the rear bearing 13
It is provided at an axial position corresponding to a boundary between the rear gear 13 and the meter gear 54, and supplies oil to the rear bearing 13 and the meter gear 54.

In this lubricating structure, the oil flowing from the oil pump 49 into the main oil hole 51 through the inlet hole 60 and flowing forward flows through the first outlet hole 52a, the second outlet hole 52b, and the third outlet hole. It comes out in the order of 52c, and the refueling amount gradually decreases in that order. In other words, the refueling amount is the largest at the distribution device 4 closest to the vehicle, and the auxiliary transmission 6 at the farthest position.
Is minimized.

However, actually, the auxiliary transmission 6 is the part that needs the most refueling. The reason is that the sub-transmission 6 is a planetary gear mechanism and has many gear meshing portions, that there are many relative moving parts and that the number of bearings is large, and that there is a Hi-Lo switching mechanism. Therefore, it is not preferable that sufficient oil cannot be supplied to the auxiliary transmission 6 due to poor lubrication, noise, seizure, and the like.

Therefore, in this embodiment, as shown in FIG. 1, an oil supply pipe O as shown in FIG.
P is inserted and arranged so that the oil introduced from the inlet hole 60 is preferentially guided through the oil supply pipe OP to the third outlet hole 52c which is a specific outlet hole. Hereinafter, this will be described in detail.

As shown in FIGS. 1 and 2, the oil supply pipe OP is an integrally molded product made of a resin material in this embodiment, and is coaxially inserted from the front end opening of the main oil hole 51.
The main oil hole 51 extends over the entire length.

The oil supply pipe OP has a main pipe 63, a pipe front end 64 connected to the front end of the main pipe 63, a front seal 65 connected to the rear end of the main pipe 63, and a predetermined distance behind the front seal 65. , A bridge portion 67 connecting the front seal portion 65 and the rear seal portion 66, a pipe rear end portion 68 extending rearward from the rear seal portion 66, and an outer periphery of the main pipe portion 63. And a plurality (four in this case) of flanges 69 formed to protrude from the portion.

The main pipe portion 63 has a circular cross section, and its outer diameter is smaller than the inner diameter of the main oil hole 51, and defines an outer peripheral passage 70 between itself and the inner wall of the main oil hole 51. The main pipe 63 extends from a position in front of the third outlet hole 52c to a position immediately before the inlet hole 60, and communicates the outer peripheral passage 70 from the first outlet hole 52a to the third outlet hole 52c.
Two oil outlets 71 are provided at 180 ° intervals at the position of the third outlet hole 52c, so that the oil in the main pipe portion 63 is first supplied to the third outlet hole 52c.

The tube front end 64 has a circular cross section larger in diameter than the main tube 63 and has a rear end opened, and a metal cap 72 is attached to the rear end by press-fitting. However, the cap 72 is provided with an oil extraction hole 73 from which oil is discharged. The cap 72 is set in the main oil hole 51 together with the pipe front end 64, and the oil supply pipe OP
The only press-fit fixed part. The other fitting portions in the main oil hole 51 are not so tightly fitted, but merely perform the center positioning of the oil supply pipe OP and the division of the internal passage.

Front seal part 65 and rear seal part 66
Is slidably fitted in the main oil hole 51 like a piston, and has seal grooves 65a and 66a on the outer peripheral portion so that a seal ring can be appropriately inserted. The front seal portion 65 and the rear seal portion 66 are arranged on both axial sides of the inlet hole 60 or at positions immediately before and immediately after the inlet hole 60.
And an inlet chamber 73 is defined, and the oil that has come out of the inlet hole 60 is temporarily stored.

The bridge portion 67 has a cross-shaped cross section in this embodiment, and connects the front seal portion 65 and the rear seal portion 66 at the center of the tube. Here, the bridge portion 67 is provided with a hole 74 for enlarging the passage area of the passage from the entrance chamber 73 to the inside of the main pipe portion 63.

That is, as shown in the GG section of FIG. 2, if there is no hole 74, the passage is only four fan-shaped surrounded by the cross-shaped bridge portion 67 and the inner wall of the main pipe portion 63. A sufficient passage area cannot be secured.

Therefore, when forming the bridge portion 67, FIG.
A shaft 75 as a core having a substantially conical (truncated conical) core as shown by a virtual line in FIG.
To the position of the center. Then, a half hole-shaped hole 74 having the same shape is formed. The cutout hole 74 passes through the front seal portion 65 and enters the inlet chamber 73, thereby forming a passage at a position between the front seal portion 65 and the rear seal portion 66, and has a passage cross section of F. The shape as shown by the -F section can be obtained, and the passage area can be enlarged. In other words, the passage area can be enlarged by removing the central portion of the bridge portion 67.

The shaft body 75 is originally used for forming the inner surface of the main pipe portion 63 and the front end portion 64 of the tube. Can be formed. Since the tip portion has a substantially conical shape and has a draft, it is easy to remove the shaft 75 after molding.

The rear seal portion 66 is provided with a through hole 76. This is to enable oil to be supplied to the fourth outlet hole 52d located on the rear side of the rear seal portion 66.
However, in this embodiment, the oil supply to the third outlet hole 52c is given the highest priority, so the through hole 76 is a relatively small hole.

The rear end 68 of the tube is also cross-shaped in cross section, but has an outer diameter smaller than that of the bridge 67. Pipe rear end 6
A sufficient oil passage is also formed around 8, and the oil there is supplied to the fourth outlet hole 52d. The pipe rear end 68 serves as a stop member when inserting the oil supply pipe OP,
This prevents excessive insertion. The oil supply pipe OP is inserted and mounted until the rear end surfaces of the cap 72 and the rear output shaft 2 are flush with each other.

The flange portions 69 are provided mainly for improving the strength, extend over the entire length of the main pipe portion 63, and are provided radially at 90 ° intervals. Especially the central part 69 in the longitudinal direction
a has a longer protruding length than both end portions, and the four central portions slidably abut against the inner wall of the main oil hole 51 so that the oil supply pipe OP is positioned coaxially with the main oil hole 51 and the outer peripheral passage 70 a Is equally divided into four in the circumferential direction.

When such an oil supply pipe OP is provided, the flow of the oil is as shown by the arrow in FIG. That is, the oil that has entered the main oil hole 51 from the oil pump 49 through the inlet hole 60 is first introduced into the inlet chamber 73, and most of the oil flows forward through the main pipe portion 63. Then, the oil flows out of the oil outlet 71 and the outer peripheral passage 7
0, enters the third outlet hole 52c, and is then supplied to the auxiliary transmission 6. Therefore, the amount of oil is not reduced on the way to the third outlet hole 52c, and the oil can be preferentially supplied to the third outlet hole 52c farthest from the inlet hole 60. As a result, a sufficient amount of oil can be supplied to the sub-transmission 6, which is the portion requiring the most oil supply, and poor lubrication can be prevented.

The third outlet hole 52c exits from the oil outlet 71.
Excess oil other than entering the oil is returned to the rear through the outer peripheral passage 70. Since the outer peripheral passage 70 is divided on the way by the flange center portion 69a, the oil is also diverted to each divided passage. In this process, the oil is sequentially supplied to the second outlet hole 52b and the first outlet hole 52a, and the oil can be sequentially supplied to the selection device 5 and the distribution device 4. Therefore, lubrication of the selection device 5 and the distribution device 4 is also ensured.

The oil also flows out of the front end 64 of the pipe and the opening of the front end of the cap 72. Since the cap 53 is attached to the input shaft 1, the oil goes radially outward and is supplied to the needle bearing 8. You.

On the other hand, the oil in the inlet chamber 73 is partially
6, and is supplied to the meshing portion of the rear bearing 13 and the meter gear 54 through the fourth outlet hole 52d.

Since the rear output shaft 2 and the oil supply pipe OP are rotating, the oil is moved radially outward by using the centrifugal force.

The oil supply pipe OP is an integrally molded product made of a resin material. Therefore, it can be manufactured easily and at low cost. It is also protected by the rear output shaft 2,
In addition, since there is little influence of the centrifugal force at the center of the rear output shaft 2, there is no problem in strength. The oil supply pipe OP
For example, it can be integrally molded using a vertically divided mold.

Since the hole 74 can be formed simultaneously with the formation of the oil supply pipe OP, the formation of the hole 74 is easy and the cost is low. Also, the entrance chamber 73 is formed by the hole 74.
The passage area of the passage that communicates with the inside of the main pipe portion 63 is increased,
A sufficient amount of oil can be sent into the main pipe portion 63.

The oil supply pipe OP has a simple structure and is easy to assemble. In addition, since it is inserted and arranged at the center of the rear output shaft 2, the influence of centrifugal force on oil can be reduced.

Various other embodiments of the present invention are conceivable. For example, the cross-sectional shape of the bridge portion is not limited to the cross shape, but may be a Y-shape, an I-shape, a tubular shape, a cylindrical shape, or the like.
The shape of the hole is not limited to a substantially conical shape, but may be a cylindrical shape or the like. However, it is preferable that the shaft, which is the molding die, be in a shape that can be easily removed after molding.

In the above embodiment, the number of the outlet holes is three in the front and downstream of the inlet hole, but the number may be any number as long as it is plural. In the above-described embodiment, the third and farthest third outlet hole 52c is a specific outlet hole that supplies oil preferentially. However, it is important that there is another outlet hole on the upstream side of the outlet hole. However, the farthest exit hole need not be a specific exit hole, and the second and subsequent exit holes, that is, all exit holes that are two or more distant from the entrance hole side, should be all specified exit holes. Can be. Therefore, in the above embodiment, the second outlet hole 52b may be a specific outlet hole.

On the other hand, as shown in FIG. 3, the flange portion 69 may be spirally formed to supply oil to the first outlet hole 52a and the second outlet hole 52b independently. That is, in the above-described embodiment, drilling is performed by penetrating the four outlet holes 52 in one direction for ease of processing. For this reason, when the first outlet hole 52a and the second outlet hole 52b are at the same phase position, and the outer peripheral passage 70 is simply divided in the circumferential direction to provide two outlet holes 52a, 52b for one divided passage, Oil flows out first through the outlet hole 52b on the side,
The amount of oil flowing out from the downstream outlet hole 52a is reduced. Therefore, if the flange portion 69 is formed in a spiral shape, the divided passage also becomes a spiral shape, and the plurality of outlet holes 52 at the same phase position are formed.
Different divided passages can be independently provided for a and 52b. In other words, it is the idea of one hole and one passage. Accordingly, a sufficient amount of oil can be supplied to the downstream outlet hole 52a, and the amount of oil flowing out can be prevented from being reduced, and at the same time, oil can be uniformly discharged from all outlet holes. In addition, since the oil spirally moves in the divided passage, lubrication can be improved by utilizing the viscosity and inertia of the oil.

In this example, there are two first outlet holes 52a and two second outlet holes 52b at the top and bottom in the figure.
There is one first outlet hole 52a and one second outlet hole 52b at each phase position separated by 80 °. That is, the first exit hole 52
There are a total of four a and second outlet holes 52b, and one divided passage is provided for each of the first outlet hole 52a and the second outlet hole 52b.

According to this concept, it is necessary to change the number of flanges and divided passages according to the number of outlet holes. There is also a concept that the divided passage may be divided between the upstream exit hole and the downstream exit hole. In this case, it is possible to provide a plurality of exit holes in one divided passage.

However, in the above embodiment, the outer peripheral passage 7
Flange 6 along zero flow direction (direction from front to back)
9 ends at the position between the second outlet hole 52b and the first outlet hole 52a, and at the position of the first outlet hole 52a, the oil of all the divided passages merges. The problem of insufficient oil amount in the first outlet hole 52a does not occur.

The present invention can be applied to not only transfer of a four-wheel drive vehicle but also any lubricating oil passage structure such as a transmission for a vehicle.

[0066]

The present invention exhibits the following excellent effects.

(1) The oil can be sufficiently supplied to the lubricating portion far from the oil supply position.

(2) Lack of lubrication, noise, burn-in, etc. can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention and showing an attached state of an oil supply pipe, wherein a left side is a front side and a right side is a rear side.

FIG. 2 is a longitudinal sectional side view showing the oil supply pipe alone, the left side being a front side and the right side being a rear side.

FIG. 3 is a perspective view showing another embodiment of the present invention.

FIG. 4 is a vertical sectional side view showing a transfer, in which a left side is a front side,
The right side is later.

FIG. 5 is a schematic front view of a transfer.

FIG. 6 is a plan view showing a four-wheel drive vehicle, in which the left side is the front (F);
The right side is the rear (R).

[Explanation of symbols]

 2 Rear output shaft (rotary shaft) 51 Main oil hole 52 Exit hole 52a First exit hole (exit hole other than specific exit hole) 52b Second exit hole (exit hole other than specific exit hole 52c Third exit hole ( (Specific outlet hole) 60 Inlet hole 65 Front seal part 66 Rear seal part 67 Bridge part 69 Flange part 70 Outer peripheral passage 73 Inlet chamber 74 Drain hole OP Oil supply pipe

Claims (9)

[Claims] An oil is introduced into a main oil hole provided at a center portion of a rotary shaft through an inlet hole, and a plurality of outlet holes are provided at different distances from the inlet hole in one direction. In the lubricating oil passage structure for supplying oil to the outside, an oil supply pipe is inserted and arranged in the main oil hole, and the oil introduced from the inlet hole is counted two or more far from the inlet hole side through the oil supply pipe. A lubricating oil passage structure characterized by being preferentially guided to a specific outlet hole. 2. The lubricating oil passage structure according to claim 1, wherein the specific outlet hole is an outlet hole furthest from the inlet hole. 3. The oil supply pipe according to claim 1, wherein an outer peripheral passage is formed between the oil supply pipe and an inner wall of the main oil hole, and oil is supplied to an outlet hole other than a specific outlet hole through the outer peripheral passage.
Or, a lubricating oil passage structure described in 2. 4. The lubricating oil passage structure according to claim 3, wherein a flange portion that divides the outer peripheral passage in a circumferential direction is provided on an outer peripheral portion of the oil supply pipe. 5. A plurality of outlet holes other than the specific outlet hole are provided at the same phase position of the main oil hole, and the flange is formed in a spiral shape so as to supply oil to each outlet hole independently. The lubricating oil passage structure according to claim 4. 6. The oil supply pipe according to claim 1, wherein the oil supply pipe has a pair of seal portions partitioning both sides of the inlet hole in the main oil hole in the axial direction to define an inlet chamber, and a bridge portion connecting the seal portions. 5. The lubricating oil passage structure according to any one of 5. 7. The lubricating oil passage structure according to claim 6, wherein the bridge portion is provided with a hole for increasing a passage area of a passage from the inlet chamber to the inside of the oil supply pipe. 8. The bridge portion has a cross-shaped cross section provided at the center of the tube, and the hole is a substantially conical hole formed in the center of the bridge portion in a semi-cut shape. Item 8. A lubricating oil passage structure according to Item 7. 9. The lubricating oil passage structure according to claim 1, wherein said oil supply pipe is an integrally molded product made of a resin material.