JPH0225006Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a one-way clutch for a fluid torque converter suitable for use in automobiles and other vehicles.

(Prior art) Generally, in a three-element one-stage torque converter, the sixth
As shown in the figure, the pump includes a pump impeller 2 directly connected to an input shaft 1, a turbine 4 directly connected to an output shaft 3, and a stator 7 connected to a fixed cylindrical shaft 5 via a one-way clutch 6. 2
The turbine 4 is driven and the rotation of the output shaft 3 increases, and the stator 7 remains stationary until the speed ratio reaches the clutch point, but after the clutch point the stator 7 begins to rotate relative to the fixed cylindrical shaft 5. . The one-way clutch 6 has an outer race 8 and retainers 9 and 10 on both sides fitted and fixed to the inner peripheral surface of the hub of the stator 7 by splines or other methods, and an inner race 11 fitted to the fixed cylinder shaft 5 by splines or other methods. , a roller 12 (including sprags) is sandwiched between an inner race 11 and an outer race 8. A radial oil passage 16 is formed between the retainer 9 and the turbine hub 15, a radial oil passage 16' is formed between the retainer 10 and the inner race 11, and oil passages are formed in the retainers 9 and 10. 16,
16' and the roller 12 side are connected to each other.
For example, three oil holes 17 and 18 for lubrication are provided, as shown in FIG. In the above structure, the oil is subjected to the pumping action of the turbine 4,
Oil flows from the turbine 4 side through the oil passage 16 between the output shaft 3 and the fixed cylindrical shaft 5, is sent to the pump (not shown) or the transmission (not shown), and then flows back into the stator 7 side from the passage 19. While a large circulation path for oil is formed, the oil flows from the oil passage 16 to the roller 12 side, and flows through the oil hole 18 and the oil passage 16'.
A small circulation path is also formed through which the air flows into the stator 7 side.

The present invention is applied to the one-way clutch 6 of such a fluid torque converter.

(Problems with the Prior Art) However, as shown in FIG. 8, the outer race 8 is provided with protrusions 8a for forming cam surfaces, and a roller 12 and a leaf spring 14 are interposed between these protrusions 8a. , the oil hole 1 of the retainer 9, 10
There is a fairly high probability that the openings on the roller 12 side of oil holes 17 and 18 will be blocked by the protrusion 8a or the roller 12, and the openings on the roller 12 side of the oil holes 17 and 18 will be blocked as shown by the imaginary line in FIG. and roller 1
The circulation of oil to the second side is insufficient, and the temperature of the one-way clutch 6 increases sharply, causing early wear of each member constituting the one-way clutch 6 and making it easy for accidents such as breakage of the leaf spring 14 to occur.

(Means for Solving the Problems) The present invention includes oil holes 17 and 18 for roller lubrication that are integrally fixed to the stator 7 and penetrate in the axial direction, and radial oil passages that communicate with the oil holes on the outer surface. 16
a pair of retainers 21 having a pair of retainers 21, an outer race 8 integrally fixed to the stator 7 and having a plurality of inward protrusions 8a, an inner race 11 integrally fixed to the output shaft 3, and an adjacent inward protrusion. 8
In the one-way clutch of a fluid torque converter equipped with a roller 12 interposed between a and 8a, the oil holes 17 and 18 are provided in one or both of the contact surfaces between the retainer 21 and the inward protrusion 8a of the outer race 8. This is a one-way clutch for a fluid torque converter characterized by forming only annular grooves 22 and 25 for oil circulation that communicate with the opening of the clutch.

(Example) Figs. 1 to 2 (Fig. 6) showing an example of the present invention.
(not corresponding to the figure), 21 is a retainer constituting the one-way clutch 6. This retainer 21 has a substantially wide ring shape, and has, for example, three oil passages 16 formed radially. For example, three oil holes 17 penetrating in the axial direction are formed so as to communicate with the oil passage 16. An annular groove 22 that communicates with the openings of all the oil holes 17 is formed on the surface 9a that contacts the outer race 8, and the openings of the oil holes 17 on the outer race 8 side are closed by projections 8a or rollers 12. It won't fall off. Therefore, the oil that flows into the oil hole 17 through the oil passage 16 due to the pumping action of the turbine 4 spreads to the annular groove 22, and evenly flows from this annular groove 22 toward all the rollers 12.

This configuration can be applied not only to the retainer 9 on the left side in FIG. 6 but also to the retainer 10 on the right side, and when applied to both the retainers 9 and 10, it is possible to prevent oil from entering the one-way clutch 6. Not only the inflow of oil but also the outflow from the one-way clutch 6 is performed extremely smoothly.

Further, in FIGS. 3 to 5 showing other embodiments, 24 is an outer race, and this outer race 24 has a substantially ring-shaped main body 24a provided with protrusions 8a forming cam surfaces at predetermined locations. As shown in FIG.
2 and a leaf spring 14 are interposed. In this embodiment, oil holes 17 and 1 are provided on both sides 8b of the protrusion 8a.
An annular groove 25 is formed that communicates with the opening of the oil holes 17 and 18 on the roller 12 side, so that the openings of the oil holes 17 and 18 on the roller 12 side are not blocked by the protrusion 8a, and oil does not flow from the oil hole 17 to the roller 12 side. In addition to smooth inflow, oil also flows out from the roller 12 side to the oil hole 18 extremely smoothly.

In the embodiments shown in FIGS. 1 to 5 above, the annular groove 22 or 25 is formed in either the retainer 21 or the outer race 24, but
Of course, the annular groove 25 may be formed in the outer race 24 at the same time as the annular groove 22 is formed in the retainer 21.

(Effect of the invention) In the one-way clutch 6 of the fluid torque converter according to the invention, one or both of the contact surfaces 8b and 9a between the retainer 21 and the outer race 24 are provided with oil flow holes that communicate with the openings of the oil holes 17 and 18. Since the annular grooves 22 and 25 are formed, the oil flowing into the oil passage 16 due to the pumping action of the turbine 4 flows smoothly from the oil hole 17 to the roller 12 side without being obstructed by the protrusion 8a, etc. The oil also flows out from the 12 side to the oil hole 18 very smoothly. Therefore, the oil is sufficiently circulated to the roller 12 side, and it is possible to eliminate problems such as rapid temperature rise of the one-way clutch 6 or early wear of each member constituting the one-way clutch 6. Accidents caused by breakage of the spring 14 can also be avoided. That is, conventionally, retainers 9 and 1 were generally used for the stator 7 in FIG.
0 and outer race 8 are fixed unrotatably, and the inner race 1
When the outer race 8 rotates with respect to the oil hole 17, the axially opposite end surfaces of the inward projections 8a of the outer race 8 and the inner surfaces of the retainers 9 and 10 slide relative to each other. Although the outlet on the roller 12 side and the inlet of the oil hole 18 on the roller 12 side may be blocked by the protrusion 8a, according to the present invention,
Retainer 21 (Figure 2) and outer races 8, 24
Since only the annular grooves 22 and 25 for oil circulation communicating with the openings of the oil holes 17 and 18 are formed on one or both of the contact surfaces with the inward protrusion 8a of the The oil filled in the annular grooves 22 and 25 is subjected to centrifugal force, and the outer part of the contact surface where oil is difficult to be supplied (radial oil grooves are not formed in the annular grooves 22 and 25) (outward part) evenly. Further, the pressurized oil that has been pressurized by the pump impeller 2 and passed through the turbine 4 flows into the roller chamber through the oil hole 17 and flows into the oil passage 1 through the oil hole 18 located approximately opposite to each other.
6', there is no part downstream of the inlet oil hole 17 where the oil flows against the action of centrifugal force, and the oil circulates through the roller chamber even more smoothly.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the retainer according to the present invention, Figure 2 is a perspective view of the retainer according to the present invention;
3 is a partially omitted perspective view of an outer race showing another embodiment; FIG. 4 is a partially omitted front view; FIG. 5 is a sectional view of FIG. 4; FIG. 6 is a partially omitted longitudinal side view showing a conventional example, FIG. 7 is a front view showing a conventional retainer, and FIG. 8 is a partially enlarged front view showing a conventional one-way clutch. 6...One-way clutch, 7...Stator, 8b, 9a...Contact surface, 1
1... Inner lace, 12... Roller, 17,
18... Oil hole, 21... Retainer, 24... Outer race, 22, 25... Annular groove.

Claims (1)

[Scope of utility model registration request] A pair of retainers 21 are integrally fixed to the stator 7 and have oil holes 17 and 18 for roller lubrication that penetrate through the stator 7 in the axial direction, and a radial oil passage 16 that communicates with the oil holes on the outer surface; an outer race 8 that is integrally fixed to the output shaft 3 and has a plurality of inward protrusions 8a, an inner race 11 that is integrally fixed to the output shaft 3, and adjacent inward protrusions 8a, 8a.
In a one-way clutch of a fluid torque converter having a roller 12 interposed therebetween, the oil hole 17,
An annular groove 2 for oil circulation communicating with the opening of 18
A one-way clutch for a fluid torque converter, characterized in that only parts 2 and 25 are formed.