JPH0868430A - Lubricating mechanism for one-way clutch - Google Patents

Abstract

PURPOSE: To circulate lubricating oil positively regardless of the relative rotating direction of the end bearing of a one-way clutch and inner-outer rings. CONSTITUTION: The inner peripheral surface 121 of an end bearing 12 having the inner peripheral surface 121 and the outer peripheral surface 122 is provided with spiral lubricating oil grooves 123A, 123B different in the inclined direction, and if necessary, dynamic pressure generating grooves 125 of symmetric shape (rhombic shape in a figure) from the circumferential view are added.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch lubrication mechanism.

[0002]

2. Description of the Related Art In a one-way clutch that transmits only a rotational force in one direction and idles in the other direction, a clutch member such as a sprag or a roller is arranged between an inner ring and an outer ring, and the clutch member has end bearings on both sides. Was guided to
A so-called sprag type or roller type one-way clutch, which meshes with an outer ring and an inner ring during transmission of rotational force and causes slippage during idling, is widely used at present.

The basic structure of the one-way clutch is shown in FIG. 5 and explained. 10 is a one-way clutch and 11 is a one-way clutch.
Is a clutch member, 12 is an end bearing, 1 is an inner ring,
Reference numeral 2 is an outer ring, 3'is a lubricating oil hole for introducing lubricating oil into the one-way clutch, 4 is a holding plate (spacer) for regulating the axial position of the one-way clutch, and 5 is a retaining ring.

In the one-way clutch, the clutch member is
Since meshing with the outer ring and slipping due to slipping are repeated, heat and friction increase if sufficient lubrication is not performed.
Since the end bearings are usually plain bearings, sufficient lubricating oil must be supplied to prevent uneven rotation and seizure. Therefore, as shown in FIG. 5, a special lubricating oil passage is provided in the one-way clutch assembly portion by providing lubricating oil holes 3 and 3'in the inner ring or the outer ring.

However, providing the lubricating oil hole inside the power transmission mechanism complicatedly complicated as the lubricating oil path requires complicated processing itself, and the members such as the inner and outer rings where the oil hole is provided are formed. Reduce strength. Further, when the one-way clutch is engaged, the clutch member steps on the oil hole opened on the raceway surface with a high surface pressure, which causes a starting point of progress of peeling and cracking, thus degrading the raceway surface.

For this reason, it is often necessary to increase the thickness of the inner and outer rings and to use an expensive material, which is a cause of deformation defects in heat treatment, etc.
I was forced to process it.

Therefore, the lubricating oil holes are not provided in the peripheral members such as the inner and outer rings, but the helical lubricating oil grooves are formed in the opposite surfaces where the inner ring or the outer ring and the end bearing or the holding plate rotate relatively. It has been devised that a lubricating oil groove causes a pumping action by relative rotation to guide the lubricating oil into the one-way clutch.

FIG. 6 shows an example thereof, in which an inner peripheral surface 121 of the end bearing 12 is provided with a spiral lubricating oil groove 123. Reference numeral 124 denotes a groove opening, and the relative rotation of the outer peripheral surface of the inner ring and the inner peripheral surface 121 of the end bearing 12 causes the lubricating oil to flow from the opening 124 through the helical lubricating oil groove 123 into the one-way clutch. To do. (In the figure, 122 is the outer peripheral surface of the end bearing.)

Further, in order to require a small amount of lubricating oil to be supplied to the one-way clutch, in the example shown in FIG. 7, the groove 12 for generating dynamic pressure is formed on the inner peripheral surface 121 of the end bearing 12.
5 is provided. Therefore, the relative rotation between the outer circumference of the inner ring and the inner peripheral surface of the end bearing increases the pressure between the inner peripheral surface of the end beng and the inner ring, so that a strong oil film sealing effect is generated, as in the case of a so-called dynamic pressure bearing. Further, there is also an oil film sealing effect due to the groove, so that there is no need to feed a large amount of lubricating oil and to provide a large number of large oil holes inside a complicated power transmission mechanism because the groove exerts an oil reservoir effect.

The dynamic pressure generating groove 125 shown in FIG. 7 has a symmetrical shape (diamond in the illustrated example) when viewed in the circumferential direction so that the relative rotational movement may change. Further, in the example shown in FIG. 8, every other groove 126A and 126B having the same shape is arranged so as to face in the opposite direction, and the dynamic pressure generating effect is obtained even if the direction of the relative movement is changed. .

[0011]

[Problems to be solved] When a spiral lubricating oil groove is provided in an end bearing, the spiral groove in one direction alone does not provide a pumping action by the spiral groove when the relative rotation direction changes. Further, as the performance of automobiles is improved, it is necessary to further increase the lubricating ability of the one-way clutch.

[0012]

In order to solve the above-mentioned problems, the present invention has an opening on the inner peripheral surface or the outer peripheral surface of an end bearing for inflowing or exhausting lubricating oil to the outer side opposite to the clutch member. , A lubricating oil groove is provided which is slanted in the axial direction leading to the inside of the clutch member side, and the groove has separate grooves slanting in the right-hand screw direction and the left-hand screw direction. is there.

[0013]

FIG. 1 shows a first embodiment of the present invention, in which the end bearing 12 has an inner peripheral surface 121 and an outer peripheral surface 122.
In this case, spiral lubricating oil grooves 123A and 123B having different inclinations in the left and right directions are provided on the inner peripheral surface 121.

The operation will be described with reference to FIG. 3. E is the inner clutch member side when viewed from the end bearing 12, and F is the outer side on the opposite side, and the lubricating oil is guided to the outside of the end bearing as indicated by arrow R. When bearing, end bearing 1
Assuming that the inner ring is rotating in the direction of arrow D when viewed from 2, the lubricating oil accumulated near the end bearing flows from A to C through the spiral groove 123A and flows into E section inside the clutch. However, it does not flow from R to D because the relative rotation is opposite. When the E section inside the clutch is fully filled with oil,
The oil inside is discharged from D to B through the spiral groove 123B.

As shown in FIG. 4, when the lubricating oil is switched to be supplied from one of A and B on both sides of the inner ring 1,
In the case of the conventional single spiral groove, the lubricating action may be defective when the flow of the lubricating oil is switched. When the end bearing of the present invention shown in FIG. 4 is used, when the lubricating oil is supplied from A, the spiral lubricating oil groove (123A in FIG. 3) provided on the inner peripheral surface 121A of the end bearing 12A on the left side of the drawing is used. , 123B) operates as described in FIG.

If the flow of the lubricating oil is switched to the direction shown by B in FIG. 4, the helical lubricating oil grooves 123A, 123 provided on the outer peripheral surface 121B of the end bearing 12B on the right side in FIG.
B (FIG. 3) also acts in the same manner, and the oil accumulated on the outside of the end bearing 12B flows into the clutch from one spiral groove according to the direction of relative rotation with the inner ring, 3 from F to E), and when the clutch is filled with oil, it is discharged to the outside.

When the lubricating oil is supplied from both A and B, the spiral lubricating oil grooves on the inner peripheral surfaces of the end bearings 12A and 12B on both sides act in the same manner, so that the oil flows into the clutch and the inside of the clutch. Discharge from.

In any of the above three cases, when the lubricating oil is discharged, not only the spiral groove inclined in the opposite direction of the spiral groove at the time of inflow of one end bearing, but also the end bearing of the opposite side It is also discharged from the spiral groove, the lubricating oil is circulated smoothly, and the cooling effect is improved.

FIG. 2 shows a second embodiment in which, in addition to the helical lubricating oil grooves 123A and 123B inclined in opposite directions shown in FIG. 1, the inner peripheral surface 121 of the end bearing 12 is symmetrical in the circumferential direction. A dynamic pressure generating groove 125 having a shape is provided.

[0020]

【effect】

(1) Since the inner peripheral surface or the outer peripheral surface of the end bearing is provided with a spiral lubricating oil groove that is inclined in the opposite direction when viewed in the axial direction, which direction is the relative rotation direction between the end bearing and the inner ring or the outer ring? Also, a pumping action occurs, so that the oil can be surely introduced into and discharged from the one-way clutch, and the lubricating oil can be circulated to improve the cooling and lubricating ability. (2) Since the end bearings are provided with grooves inclined in both directions, the end bearings used on both sides can be shared. (3) By adding a dynamic pressure generating groove having a symmetrical shape in the rotational direction, in addition to the effect of the above-mentioned spiral groove, there is an oil seal effect, and the lubricating ability of the one-way clutch can be achieved with a small amount of oil. You can

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of an end bearing according to the present invention.

FIG. 2 is a diagram showing a second embodiment of the same.

FIG. 3 is an explanatory view of the action of the spiral lubricating oil groove.

FIG. 4 is an explanatory diagram of the flow of lubricating oil in the one-way clutch.

FIG. 5 is an explanatory diagram of a configuration of a one-way clutch.

FIG. 6 is a view showing a conventional lubricating oil groove.

FIG. 7 is a view showing a conventional dynamic pressure generating groove.

FIG. 8 is a diagram showing an example of another arrangement of conventional dynamic pressure generating grooves.

[Explanation of symbols]

 10 One-way clutch 1 Inner ring 2 Outer ring 3 Oil hole 4 Spacer 5 Stop ring 12 End bearing 121 Inner peripheral surface 122 Outer peripheral surface 123 Helical lubricating oil groove 124 Lubricating oil groove opening 125 Dynamic pressure generation groove 126A Dynamic pressure generation groove 126B Dynamic pressure generation groove

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[Procedure amendment]

[Submission date] October 17, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

[Problems to be solved] When a spiral lubricating oil groove is provided in the end bearing , the lubricating oil is applied to both sides of the inner ring 1 as shown in FIG.
When switching so that it is supplied from one of A and B of
Is a unidirectional spiral groove like the conventional one.
When the flow of lubricating oil is switched, the pump works in the spiral groove.
It may not work well and may cause problems with lubrication. Further, as the performance of automobiles is improved, it is necessary to further increase the lubricating ability of the one-way clutch.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

[0020]

[Effects] (1) A groove inclined in the right-hand screw direction and a groove inclined in the left-hand screw direction which are inclined in the axial direction on the inner peripheral surface or the outer peripheral surface of the end bearing.
Since both are separately provided, a pumping action will occur regardless of the relative rotation direction of the end bearing and the inner ring or outer ring, ensuring the inflow and discharge of oil into the one-way clutch. The lubricating oil can be circulated to improve the cooling and lubricating ability. (2) Since the end bearings are provided with grooves inclined in both directions, the end bearings used on both sides can be shared. (3) By adding a dynamic pressure generating groove having a symmetrical shape in the rotation direction, in addition to the effect of the above-mentioned spiral groove, there is an oil seal effect, and the lubricating ability of the one-way clutch can be further achieved with a small amount of oil. You can

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (2)

[Claims] 1. A lubrication mechanism for guiding lubricating oil into a one-way clutch, comprising: an inner peripheral surface or an outer peripheral surface of an end bearing for guiding a clutch member such as a sprag or a roller; and a lubricating oil external to the clutch member. There is an opening for inflowing and exhausting, and an axially inclined lubricating oil groove that leads to the inside of the clutch member side is provided, and there are separate grooves that incline to the right screw direction and grooves that incline to the left screw direction. The characteristic one-way clutch lubrication mechanism. 2. A dynamic pressure generating groove is formed on the inner peripheral surface or the outer peripheral surface of the end bearing in addition to the lubricating oil groove according to claim 1, and the dynamic pressure generating groove is in either the circumferential direction. As seen from the above, the one-way clutch lubrication mechanism is characterized in that the combination of a plurality of grooves is arranged in the same pattern.