JP2000046158A - Lubricating structure for spline portion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating structure for spline portions that is easy to machine and is freely variable in lubricating oil quantity supplied to spline portions. SOLUTION: A rotary shaft 7 includes an external spline portion 7a, on which an internal spline portion 11a of a rotor 11 is fitted for integral rotation. The rotary shaft 7 also has an axial lubrication bore 7c, an annular groove 7h cut in the external spline portion 7a, and a radial lubrication hole 7e cut through a place axially offset from the annular groove 7h so as to open on the external spline portion 7a from the axial lubrication bore 7c. The section from the radial lubrication hole 7e to the annular groove 7h serves as an orifice to check an excessive flow of lubricating oil to the spline portions 7a and 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication structure for a spline used for supporting a reduction gear of an automatic transmission.

[0002]

2. Description of the Related Art In a horizontal type automatic transmission, there is a type in which a reduction gear meshing with each other is fixed to shaft ends of an input shaft and an output shaft. However, there is a disadvantage that the gear sound generated on the tooth surface of the reduction gear propagates to the transmission case close to the reduction gear, and a large radiation sound is generated from the case surface. In particular, the gear sound of the reduction gear is a high frequency sound, and this sound resonates with the case, resulting in harsh noise.

[0003] In order to reduce such noise, there is a type in which a reduction gear is floatingly supported on an input shaft and an output shaft (for example, Japanese Utility Model Application Laid-Open No. 58-165361).
No.). In this case, since the reduction gear is not fastened and fixed to the shaft in the thrust direction, the vibration from the gear tooth surface is reduced inside the transmission, and the vibration on the case surface is greatly reduced.

FIG. 1 shows an example of a floating support structure for a reduction gear. In the drawing, an outer spline portion 21 is formed on a shaft 20, and an inner spline portion 23 of a reduction gear 22 is fitted into the outer spline portion 21,
The reduction gear 22 is locked by a lock nut 24 screwed to the shaft 20. In this case, since it is necessary to lubricate the spline portions 21 and 23, the shaft 20 is provided with the shaft center lubrication hole 25, the outer spline portion 21 is provided with the annular groove 26, and the shaft center lubrication hole 25 communicates with the annular groove 26. A radial lubrication hole 27 is provided. That is, the oil that has flowed in the outer circumferential direction through the radial lubrication hole 27 due to centrifugal force flows into the annular groove 26, and the spline portion 2 passes through the annular groove 26.
The oil can be supplied substantially evenly to the entire circumferences of 1 and 23.

[0005]

The shaft 20 may have portions other than the spline portions 21 and 23 to be lubricated, and other radii extending from the shaft center lubrication hole 25 to the outer peripheral surface of the shaft 20 may exist. Directional lubrication holes (not shown) may be provided. In this case, a relatively small amount of lubricating oil is required for the spline portions 21 and 23. However, when a large amount of lubricating oil needs to be supplied to other lubricating parts, the diameter of the radial lubricating hole 27 is changed to another radial direction. Must be smaller than the lubrication hole.
However, in order to machine a lubricating hole having a small hole diameter, a thin drill must be used, and there is a problem in terms of the durability of the drill, and there is a disadvantage that the cost is increased.

Therefore, an object of the present invention is to facilitate processing,
An object of the present invention is to provide a lubricating structure for a spline portion that can freely adjust the amount of lubricating oil to the spline portion.

[0007]

According to a first aspect of the present invention, an outer spline portion is provided on a rotating shaft, and an inner spline portion of a rotating body is fitted to the outer spline portion. Thereby, in a structure attached so as to be integrally rotatable, a shaft center lubrication hole is provided in the shaft center of the rotating shaft, and an annular groove is formed in at least one of an outer spline portion of the rotating shaft and an inner spline portion of the rotating body, There is provided a lubrication structure for a spline portion, wherein a radial lubrication hole is formed at a position offset in the axial direction from the annular groove and communicates with the outer spline portion from the shaft center lubrication hole.

[0008] The invention described in claim 2 is the first invention.
The shaft center lubrication hole of the rotating shaft has one end opened and the other end sealed, lubricating oil is supplied from the opening end, and the shaft center lubrication hole of the rotation shaft near the sealing end. The radial lubricating hole is formed at the position, and another radial lubricating hole communicating from the axial lubricating hole to the outer peripheral surface of the rotating shaft is provided between the radial lubricating hole and the open end of the axial lubricating hole. And a lubrication structure for the spline portion, wherein the lubrication structure is formed.

The oil supplied from the shaft lubrication hole flows to the spline portion through the radial lubrication hole by centrifugal force.
However, since the radial lubrication hole communicates with the position of the outer spline portion offset in the axial direction from the annular groove, the oil flowing through the radial lubrication hole flows into the narrow gap between the outer spline portion and the inner spline portion. Become. Then, after flowing into the annular groove through this gap, it is supplied to the entire circumference of the spline portion. In other words, the portion between the outer peripheral opening end of the radial lubrication hole and the annular groove functions as an orifice, so as to regulate the flow of more oil than necessary. Therefore,
Even without reducing the diameter of the radial lubrication hole, by changing the axial offset amount between the radial lubrication hole and the annular groove,
The amount of lubricating oil to the spline can be adjusted freely.

According to the second aspect of the present invention, since the shaft center lubrication hole of the rotating shaft has a structure in which one end is opened and the other end is sealed, the oil pressure on the sealed end is increased, and the spline is increased. Although the amount of oil supplied to the part tends to be larger than the amount of oil supplied to other lubricating parts, the amount of oil is reduced by the orifice function of the spline part as described above, Lubricating oil amount can be secured.

The annular groove may be provided on either the outer spline portion of the rotating shaft or the inner spline portion of the rotating body, or may be provided on both. However, it is desirable to provide it on the outer spline portion of the rotating shaft, since the machining is easy and the offset amount with the radial lubrication hole can be set accurately.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a schematic diagram showing a four-speed forward and one-speed reverse type automatic transmission having a lubricating structure according to the present invention. The automatic transmission includes a torque converter 1, an input shaft 2 to which engine power is transmitted via the torque converter 1, three clutches C1 to C3, and two brakes B
1, B2, a one-way clutch F, a Ravigneaux type planetary gear device 4, an output gear 5, an output shaft 7, a differential device 8, and the like.

The forward sun gear 4a of the planetary gear set 4
And the input shaft 2 are connected via a C1 clutch.
The rear sun gear 4b and the input shaft 2 are connected via a C2 clutch. The carrier 4c is connected to the intermediate shaft 3,
The intermediate shaft 3 is connected to the input shaft 2 via a C3 clutch. The carrier 4c is a B2 brake and a carrier 4c.
and c is connected to the transmission case 6 via a one-way clutch F that allows only forward rotation (engine rotation direction). The carrier 4c supports two types of pinion gears 4d and 4e, the forward sun gear 4a meshes with a long pinion 4d having a long shaft length, and the rear sun gear 4b is connected to the long pinion 4 via a short pinion 4e having a short shaft length.
is engaged with d. The ring gear 4f that meshes with only the long pinion 4d is connected to the output gear 5. The output gear 5 is connected to a differential 8 via an output shaft 7. The automatic transmission implements four forward speeds and one reverse speed by operating the clutches C1, C2, C3, the brakes B1, B2, and the one-way clutch F.

As shown in FIG. 3, the left and right ends of the output shaft 7 are rotatably supported by a case 6 via bearings 9 and 10. An outer spline portion 7 is provided at the left end of the output shaft 7.
The inner spline portion 11a of the reduction gear 11 is spline-fitted to the outer spline portion 7a and is prevented from coming off by the lock nut 12. The reduction gear 11 meshes with the output gear 5. Since the lock nut 12 is in contact with the step 7 b of the output shaft 7, the reduction gear 11
2, the reduction gear 11 is floatingly supported on the output shaft 7, that is, supported on the output shaft 7 so as to be movable in the axial direction. Thus, the reduction gear 11
Floating support can prevent generation of noise due to gear vibration of the gears 5 and 11.

As a method of floatingly supporting the reduction gear 11 on the output shaft 7, a method of preventing the reduction gear 11 from being detached by the lock nut 12 as in the embodiment, for example, by using a snap ring to prevent the reduction gear 11 from being detached, or by using a metal or metal material A non-metallic cushioning material is arranged, and the reduction gear 11
May be suppressed in the thrust direction.

A shaft center lubrication hole 7c is formed in the shaft center of the output shaft 7, and its right end is open and its left end is sealed. A lubricating oil supply pipe 13 is arranged facing the opening 7d of the shaft center lubrication hole 7c, and lubricating oil is supplied to the shaft center lubrication hole 7c from a nozzle hole 13a of the pipe 13. Note that an annular plug 14 is attached to the opening 7d in order to suppress the oil supplied to the shaft center lubrication hole 7c from flowing out from the opening 7d. A first lubrication hole (radial lubrication hole) 7e communicating with the outer spline portion 7a is formed on the sealing end side of the shaft center lubrication hole 7c, and the output shaft 7 supported by the bearing 10 is formed on the opening end side. A second lubrication hole (radial lubrication hole) 7g communicating with the outer peripheral surface of the portion 7f is formed.

The outer spline portion 7a has a first lubrication hole 7e.
An annular groove 7h is formed at a position offset by a predetermined amount δ in the axial direction. The oil supplied to the outer peripheral side through the first lubrication hole 7e by centrifugal force passes through the gap between the outer spline portion 7a and the inner spline portion 11a, and the annular groove 7h
, And supplied from here to the entire circumference of the outer spline portion 7a and the inner spline portion 11a.

A final reduction gear 15 is integrally formed on the right end (the shaft end on the engine side) of the output shaft 7, and the final reduction gear 12 meshes with a ring gear 16 of the differential device 8. Another nozzle hole 13 b is formed at the end of the lubricating oil supply pipe 13, and lubricating oil is supplied toward the differential 8 from the nozzle hole 13 b.

In the lubricating structure having the above structure, the pipe 13
Supplied to the shaft center lubrication hole 7c from the output shaft 7 via the first lubrication hole 7e and the second lubrication hole 7g by centrifugal force.
Is supplied to the outer peripheral surface. In particular, the first lubrication hole 7 on the sealing end side
e tends to be supplied with more oil than the second lubrication hole 7g on the opening end side, and there is a possibility that the amount of oil to the bearing 10 that requires more lubrication oil may be insufficient. On the other hand, a small amount of lubricating oil may be supplied to the spline portions 7a and 11a that are supported in a floating state.

In the present invention, the first lubrication hole 7e and the annular groove 7h
Are offset δ in the axial direction, the first lubrication hole 7e
The oil flows from the outer spline portion 7a to the annular groove 7h.
It is necessary to pass through a narrow gap between the inner spline 11a and the inner spline 11a. That is, this portion functions as an orifice and limits the amount of oil flowing through the first lubrication hole 7e. Therefore, even if the diameters of the first lubrication hole 7e and the second lubrication hole 7g are the same, the amount of oil flowing through the second lubrication hole 7g can be larger than that of the first lubrication hole 7e.

The amount of oil flowing through the first lubrication hole 7e can be freely adjusted by the offset amount δ between the first lubrication hole 7e and the annular groove 7h. That is, by increasing the offset amount δ, the throttling effect can be enhanced and the amount of supplied oil can be reduced. Therefore, it is not necessary to change the hole diameters of the first lubrication hole 7e and the second lubrication hole 7g according to the amount of supplied oil.

In the above embodiment, the present invention is applied to the spline portion of the reduction gear floatingly supported on the output shaft. However, the present invention is not limited to this. The spline is fitted on the rotary shaft and lubrication is required. Applicable to splines of any rotating body.

[0023]

As is apparent from the above description, according to the present invention, since the radial lubrication hole is formed at the position of the outer spline portion axially offset from the annular groove, the radial lubrication hole flows through the radial lubrication hole. After the oil flows into the narrow gap between the outer spline portion and the inner spline portion, it flows into the annular groove and is supplied to the entire circumference of the spline portion. That is, since the area between the radial lubrication hole and the annular groove functions as an orifice, the amount of lubricating oil to the spline portion can be freely adjusted by changing the axial offset amount between the radial lubrication hole and the annular groove. . In addition, since it is not necessary to reduce the diameter of the radial lubrication holes, the processing is facilitated and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a conventional spline portion lubrication structure.

FIG. 2 is a skeleton diagram of an example of an automatic transmission to which the lubrication structure according to the present invention is applied.

FIG. 3 is a specific enlarged sectional view of a part of the automatic transmission shown in FIG. 2;

[Explanation of symbols]

 7 Output shaft (rotating shaft) 7a Outer spline portion 7c Shaft center lubrication hole 7d Opening 7e First lubrication hole (radial lubrication hole) 7g Second lubrication hole (radial lubrication hole) 7h Annular groove 9,10 Bearing 11 reduction Gear (rotating body) 12 Lock nut

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J063 AB02 AC04 BA01 BA03 BA09 BB48 CA01 CB13 CB41 CD63 XA37 XB06 XD03 XD43 XD44 XD72 XE43

Claims (2)

[Claims] 1. A structure in which an outer spline portion is provided on a rotating shaft, and an inner spline portion of a rotating body is fitted to the outer spline portion so as to be integrally rotatable. A lubrication hole is provided, and an annular groove is formed in at least one of the outer spline portion of the rotating shaft and the inner spline portion of the rotating body. A lubrication structure for a spline portion, characterized in that a radial lubrication hole leading to the spline portion is formed. 2. The shaft center lubrication hole of the rotating shaft is open at one end and sealed at the other end. Lubricating oil is supplied from the opening end, and the shaft center lubricating hole of the rotation shaft is closed. The radial lubrication hole is formed at a position near the sealing end, and between the radial lubrication hole and the open end of the shaft lubrication hole, another lubrication hole communicating from the shaft lubrication hole to the outer peripheral surface of the rotating shaft is provided. The lubrication structure for a spline portion according to claim 1, wherein a radial lubrication hole is formed.