JP2005180670A - One-way clutch structured in a single piece with rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch structured in a single piece with a rolling bearing capable of widening a J-space compared with the conventional arrangement having a sufficiently wider J-space to exercise a large transmitting torque when applied in a place where a thin-model rolling bearing is used and also capable of improving workability for assembly to a shaft or a housing. <P>SOLUTION: A raceway surface for the rolling bearing 2a and a raceway surface for the one-way clutch 2b are formed in the outer race 2 of the rolling bearing and in the inner race 1 only the raceway surface for the rolling bearing 1a is formed. The outer peripheral side of a sprag 4 makes contact with the outer race 2 and the inner peripheral side contacts the shaft S directly and by configuring to transmit the torque between the shaft S and the outer race 2, the J-space is widened only by the wall thickness of the inner race 1 and the inner race 1 can make an insertion into the shaft S looser compared with the conventional way by departing from a torque transmitting passage through the sprag 4. By this way, workability of the assembly can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rolling bearing integrated one-way clutch in which a rolling bearing and a sprag type one-way clutch are integrated.

  In a rolling bearing integrated one-way clutch in which a rolling bearing such as a ball bearing and a sprag type one-way clutch are integrated, an inner ring 31 and an outer ring are generally shown in FIG. The rolling bearing raceways 31a and 32a are formed on the rolling bearing 32, and a plurality of rolling elements 33 are movably disposed therebetween. The inner ring 31 and the outer ring 32 are respectively provided with rolling bearing bearings 31a and 32a. The raceway surfaces 31b and 32b for the one-way clutch are formed in parallel to the raceway surfaces 31a and 32a, and a plurality of sprags 34 are arranged between them.

  In this example, the rolling elements 33 and the sprags 34 are respectively held by a common retainer 35, and are thus arranged at a constant pitch in the circumferential direction in an annular space formed between the inner ring 31 and the outer ring 32. Each sprag 34 is biased in the locking direction by a biasing means such as a garter spring 36.

  The sprag raceway surfaces 31b and 32b of the inner ring 31 and the outer race 32 are usually on the extensions of the shoulder portions 31c and 32c of the raceway surfaces 31a and 32a for rolling bearings as shown in the drawing, that is, the shoulder portions 31c, It is formed under the same diameter as 32c.

  By the way, in the sprag type one-way clutch, the larger the J space that is the dimension between the inner and outer raceway surfaces, the larger sprag can be used and the performance including transmission torque is improved. Can be made. In the conventional rolling bearing integrated one-way clutch shown in FIG. 3, the diameter of the raceway surface for the sprags of the inner and outer rings is the same as the diameter of the shoulder portion of the raceway surface for the rolling bearing. Depending on the bearing model number (size), the dimension of the J space becomes substantially constant, and there is a limit to improving the performance of the one-way clutch.

  Therefore, the present inventors have shown an axial parallel sectional view in FIG. 4 in order to make the J space wider and improve the performance such as the transmission torque as compared with the conventional one-way clutch integrated with a rolling bearing. Of the inner ring 41 and the outer ring 42, between one of the bearing rings (inner ring 41 in FIG. 4), between the shoulder 41c adjacent to the rolling bearing raceway surface 41a and the raceway surface 41b for unidirectional cracking. Has proposed a rolling bearing integrated one-way clutch that can secure a wider J space by providing a step 410 (see Patent Document 1).

In FIG. 4, the rolling element (ball) 43 of the rolling bearing and the sprag 44 of the one-way clutch are held by dedicated cages 45 and 46, respectively, and a plurality of spring pieces 47b are integrated with the ring-shaped base body 47a. A rolling bearing integrated one-way clutch of the type in which each sprag 44 is urged in the locking direction by each spring piece 47b using the spring member 47 formed in Fig. 3 is illustrated. Similar to the one shown, it may be held by a common retainer, or the same garter spring as shown in FIG. 3 may be used as the sprag urging means.
JP 2000-291651 A

  By the way, the above proposal makes it possible to make the J space wider than a conventional one-way clutch with the same type of rolling bearing, and improve the performance including the transmission torque. However, even with this proposed technique, the space between the shaft and the housing is small, and there is a limit to securing the J space when applied to a place where a thin rolling bearing is used.

  Further, in the one-way clutch integrated with a rolling bearing, generally, in the locked state of the sprag, each sprag is locked between the inner ring and the outer ring to transmit torque, so that the inner ring is fitted to the shaft and the outer ring is fitted. If the fitting to the housing is not tight to a certain extent, slipping may occur between the inner ring and the shaft or between the outer ring and the housing when locked. However, a large built-in load was required, and it was difficult to say that the workability of the assembly was good.

  The present invention has been made in view of such circumstances, and not only the conventional rolling bearing integrated one-way clutch but also the rolling bearing integrated one-way clutch according to the above-described proposed technology can save J space. Even when applied to locations where thin rolling bearings are used, it is possible to secure a sufficiently large J space and exhibit a large torque transmission capability, and to be mounted on a shaft or housing. An object of the present invention is to provide a rolling bearing integrated one-way clutch that can improve workability.

  In order to solve the above problems, the rolling bearing integrated one-way clutch of the invention according to claim 1 is a rolling bearing integrated one-way clutch in which a sprag type one-way clutch is integrally formed on the side of the rolling bearing. The one-way clutch raceway surface, which is in contact with the outer peripheral side of each sprag of the one-way clutch, is integrally formed on the side surface in the axial direction of the raceway surface of the outer ring of the rolling bearing. The side comes into contact with the outer peripheral surface of the shaft fitted to the inner peripheral surface of the inner ring of the rolling bearing, and the torque transmission operation is performed between the outer peripheral surface of the shaft and the one-way clutch raceway surface of the outer ring inner peripheral surface. It is characterized by being composed.

  In order to solve the same problem, the rolling bearing integrated one-way clutch of the invention according to claim 3 is a rolling bearing in which a sprag type one-way clutch is integrally formed on the side of the rolling bearing in the same manner as described above. In the integrated one-way clutch, a one-way clutch raceway surface that is in contact with the inner peripheral side of each sprag of the one-way clutch is integrally formed on the axial direction side of the raceway surface of the inner ring of the rolling bearing. Each of these sprags is in contact with the inner peripheral surface of the housing to which the outer ring outer peripheral surface of the rolling bearing is fitted, and between the inner peripheral surface of the housing and the inner ring one-way clutch raceway surface. It is characterized by being configured to perform a torque transmission operation.

  Here, in the invention according to claim 1, the outer diameter dimension of the portion where the inner peripheral side of each sprag of the shaft contacts is substantially equal to the outer diameter dimension of the portion fitted to the inner ring inner peripheral surface of the rolling bearing. In the invention according to claim 3, the inner diameter dimension of the portion where the outer peripheral side of the sprag of the housing contacts and the inner diameter dimension of the portion where the outer peripheral surface of the rolling bearing outer ring is fitted are obtained. A substantially equal configuration (claim 4) can be preferably employed. In the present invention, the outer diameter dimension of the shaft in two parts or the inner diameter dimension of the housing in two parts is “substantially equal” means that the outer diameter or inner diameter dimension is uniform without intentionally providing a step or the like. It means that.

  Further, in the present invention, “the outer peripheral surface of the shaft” includes not only the outer peripheral surface of the shaft main body but also the outer peripheral surface of another member fixed to the shaft main body and constituting substantially one shaft body, The “inner peripheral surface of the housing” includes not only the inner peripheral surface of the housing main body but also the inner peripheral surface of another member fixed to the housing main body and constituting substantially one housing body.

  The present invention seeks to achieve an intended object by utilizing either the inner or outer raceway surface of the inner or outer raceway surface for a one-way clutch as the outer peripheral surface of the shaft or the inner peripheral surface of the housing. It is.

  That is, in the invention according to claim 1, of the inner and outer rings of the rolling bearing, the outer ring is integrally formed with the one-way clutch raceway surface that contacts the outer peripheral side of the sprag of the one-way clutch as in the conventional one. However, only the rolling bearing raceway surface is formed for the inner ring so that it is substantially dedicated to the rolling bearing, and the inner peripheral side of the sprag is brought into direct contact with the outer peripheral surface of the shaft without contacting the inner ring. Thereby, compared with the case where the track surface of the one-way clutch is formed on the outer peripheral surface of the inner ring as in the prior art, the J space can be widened by the thickness of the inner ring.

  On the other hand, in the invention according to claim 3, of the inner and outer rings of the rolling bearing, the inner ring is integrally formed with a raceway surface for a one-way clutch as in the conventional one, but the outer ring is for a rolling bearing. Only the raceway surface is formed so that it is substantially dedicated to the rolling bearing, and the outer peripheral side of the sprag is brought into direct contact with the inner peripheral surface of the housing without contacting the outer ring. Thus, as described above, the J space can be widened by the thickness of the outer ring as compared with the conventional one.

  In the invention according to claim 1, the outer diameter dimension of the shaft of the portion where the inner peripheral side of the sprag contacts, and the inner diameter dimension of the housing of the portion where the outer peripheral side of the sprag contacts in the invention according to claim 3, Each is not particularly limited, but solves the above-mentioned problems, and without adopting a special structure for the shaft or the housing, that is, a special structure because the present invention is applied. In order to adopt the structure with the directional clutch assembled, the inner diameter of the inner ring is fitted to the outer diameter of the shaft of the part where the inner circumference of the sprag contacts, as in the invention according to claim 2 or 4. The outer diameter of the portion to be fitted can be made approximately equal to the outer diameter of the housing, or the inner diameter of the portion of the housing where the outer periphery of the sprag contacts can be made substantially equal to the inner diameter of the portion to which the outer ring outer peripheral surface is fitted. Masui. As a result, the above-described problems can be solved, and other performances required for the shaft and the housing are not affected, and an increase in the manufacturing cost of the shaft or the housing can be avoided.

  According to the first aspect of the present invention, the raceway surface for the one-way clutch is integrally formed only on the outer ring of the rolling bearing to contact the outer peripheral side of the sprag, and the inner peripheral side of each sprag is rolled without contacting the inner ring. Direct contact is made with the outer peripheral surface of the shaft to which the inner ring of the bearing is fitted, and torque is applied between the raceway surface for the one-way clutch formed on the inner periphery of the outer ring and the outer peripheral surface of the shaft. Since it is configured to transmit, both the inner ring and the outer ring are integrated with a rolling bearing raceway surface and a one-way clutch raceway surface so that the sprags transmit torque between the inner and outer rings. Compared to the body type one-way clutch, the J space can be widened, and the performance such as transmission torque can be improved.

  In the invention according to claim 3, the raceway surface for the one-way clutch is integrally formed only on the inner ring of the rolling bearing to contact the inner peripheral side of the sprag, and the outer peripheral side of each sprag is not contacted to the outer ring. The outer ring of the rolling bearing is brought into direct contact with the inner peripheral surface of the housing to be fitted, and each sprag is formed between the raceway surface for the one-way clutch formed on the outer periphery of the inner ring and the inner peripheral surface of the housing. Since it is configured to transmit torque, the J space can be made wider than the conventional one as in the above, and the performance such as transmission torque can be improved.

  In each of the above inventions, the sprag transmits torque between the outer ring and the shaft, or between the inner ring and the housing, so that only the raceway surface of the rolling bearing is formed. The inner ring and the outer ring in claim 2 are excluded from the torque transmission path, and it is not necessary to make the fitting between the race ring and the shaft or the housing tight as in the conventional case. Can be fitted to the shaft or the housing, and the assembling workability is improved.

  Then, as in the invention according to claim 2 or 4, the outer diameter dimension of the shaft at the part where the sprag contacts is made equal to the outer diameter dimension of the part fitted to the inner ring of the rolling bearing, or the sprag contacts. By adopting a configuration in which the inner diameter dimension of the housing of the part is substantially equal to the inner diameter dimension of the housing to which the outer ring of the rolling bearing is fitted, the cost of the shaft or the housing is not affected, and these costs are reduced. The above-described effects can be achieved without increasing the value.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an axial parallel cross-sectional view of an embodiment of the invention according to claim 1 and is a view showing a state where the shaft S and the housing H are assembled.

  The rolling bearing integrated one-way clutch in this example holds an inner ring 1 and an outer ring 2, a plurality of balls 3, a plurality of sprags 4, which are arranged so as to be able to roll between them, and each ball 3 at a constant circumferential pitch. A plurality of spring pieces 7b for urging each sprag 4 in the locking direction on the ring-shaped base body 7a, and a ball holder 5 for holding each sprag 4 at a constant pitch in the circumferential direction. And the seals 8 and 9 for sealing both ends in the axial direction. A shaft S is fitted to the inner circumferential surface of the inner ring 1, and the outer circumferential surface of the outer ring 2 is fitted to the housing H.

  The feature of this example is that the outer ring 2 is formed with a rolling bearing raceway surface 2a and a one-way clutch raceway surface 2b, whereas the inner ring 1 is formed with only a rolling bearing raceway surface 1a. The inner peripheral side of each sprag 4 is in direct contact with the surface of the shaft S, and the width dimension (axial dimension) of the inner ring 1 is shorter than that of the outer ring 2, and each sprag 4 is disposed. It is a point that does not reach the position.

That is, like the conventional one-way clutch of this type, the outer ring 2 has a rolling bearing raceway surface 2a on which the ball 3 rolls and an adjacent to the rolling bearing raceway surface 2a. A one-way clutch raceway surface 2b is formed in parallel with which the outer peripheral side of each sprag 4 contacts. On the other hand, only the rolling bearing raceway surface 1a on which the ball 3 rolls is formed on the outer periphery of the inner ring 1, and the width dimension (axial dimension) of the inner ring 1 is shorter than that of the outer ring 2, It does not reach the position where each sprag 4 is disposed. Each sprag 4 is in contact with the one-way clutch raceway surface 2b formed on the outer ring 2 on the outer peripheral side, and directly in contact with the outer peripheral surface of the shaft S on the inner peripheral side. Substantially forms an inner one-way clutch raceway surface _STC .

Axis S is the outer diameter of the fitting portion S _F for the inner ring 1, a portion inner circumferential side of the sprag 4 are in contact, that is, the outer diameter at the formation site of the one-way clutch for raceways S _TC are equal to each other .

  According to the above embodiment, the J space that is the dimension between the inner and outer raceway surfaces of each sprag 4 can be widened by the thickness of the inner ring 1 as compared with the conventional one. Can be made larger. As a result, performance such as transmission torque can be improved. Further, since the sprag 4 transmits torque between the outer ring 2 and the shaft S, even if the fitting between the inner ring 1 and the shaft S is loose as compared with the conventional case, the sprag 4 is caused by slippage between them. A reduction in transmission torque can be eliminated, and the assembling work to the shaft S and the housing H can be facilitated as compared with the prior art.

Next, an embodiment of the invention according to claim 3 will be described. FIG. 2 is an axial parallel sectional view thereof.
The feature of this example is that a rolling bearing raceway surface 11 a and a one-way clutch raceway surface 11 b are formed on the inner ring 11, while only the rolling bearing raceway surface 12 a is formed on the outer ring 12, and the outer peripheral side of each sprag 14 is formed. This is a point where the inner peripheral surface of the housing H is in direct contact.

That is, the inner ring 11 has a rolling bearing raceway surface 11a on which the ball 13 rolls and an inner circumference side of each sprag 14 in contact with and parallel to the rolling bearing raceway surface 11a. A direction clutch raceway surface 11b is formed. On the other hand, only the rolling bearing raceway surface 12a on which the ball 13 rolls is formed on the outer ring 2 on the outer ring 2, and the outer ring 12 has a shorter width than the inner ring 11, and each sprag 14 is disposed. It does not reach the position. Each sprag 14 is in contact with the one-way clutch raceway surface 11 b formed on the inner ring 11 on the inner peripheral side, and directly in contact with the inner peripheral surface of the housing H on the outer peripheral side. The circumferential surface substantially forms the inner one-way clutch raceway surface _HTC .

The housing H has a inner diameter of the fitting portion H _F of the outer ring 12, and the inner diameter at the formation site of the one-way clutch for raceways H _TC outer peripheral side a portion for contacting the sprags 14 are equal to each other.

  In this example, the ball 13 and the sprag 14 are held by a common holder 15. The cage 15 has a structure in which the first and second annular bodies 15a and 15b are engaged and integrated in the axial direction. That is, the first annular body 15a is formed with a plurality of engaging portions 150 protruding in the axial direction at a constant pitch in the circumferential direction, and penetrates each engaging portion 150 in the radial direction. An engagement hole 151 is formed. Further, the second annular body 15b is formed such that the claw portions 152 protrude in the axial direction at the same pitch in the circumferential direction, and a return portion 153 is formed in each claw portion 152. Then, the first and second annular bodies 15a and 15b are engaged by engaging the return portions 153 of the claw portions 152 of the second annular body 15b with the respective engagement holes 151 of the first annular body 15a. The cage 15 is formed by engaging and integrating in the axial direction.

  Further, in this example, a flat plate portion 154 is integrally formed on one end side in the axial direction of the first annular body 15a forming the cage 15, and the flat plate portion 154 has a sealing function on one end side in the axial direction. doing. Further, in this example, the spring member 17 for urging each sprag 14 in the locking direction is formed by integrally forming a plurality of spring pieces (not shown in FIG. 2) on the annular base body 17a as in the previous example. The spring member 17 is fixed to the retainer 15, and the base body 17a has a sealing function on the other end side in the axial direction.

  According to the above embodiment, the J space which is the dimension between the inner and outer raceway surfaces of each sprag 14 can be widened by the thickness of the outer ring 2 as compared with the conventional one. The size can be further increased, and performance such as transmission torque can be improved. Further, since the sprag 14 transmits torque between the inner ring 1 and the housing H, even if the fitting between the outer ring 2 and the housing H is loose as compared with the conventional case, the sprag 14 is caused by slippage between them. A reduction in transmission torque can be eliminated, and the assembling work to the shaft S and the housing H can be facilitated as compared with the prior art.

It is an axial parallel sectional view of an embodiment of the invention according to claim 1. It is an axial parallel sectional view of an embodiment of the invention according to claim 2. It is an axial parallel sectional view showing a configuration example of a conventional rolling bearing integrated one-way clutch. It is an axial parallel sectional view showing the configuration of the rolling bearing integrated one-way clutch described in Patent Document 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Inner ring 1a, 11a Rolling bearing raceway surface 11b Unidirectional clutch raceway surface 2,12 Outer ring 2a, 12a Rolling bearing raceway surface 2b Unidirectional clutch raceway surface 3,13 Ball 4,14 Sprag 5,6 15 Cage 7, 17 Spring member 8, 9 Seal S Shaft H Housing

Claims (4)

In a rolling bearing integrated one-way clutch in which a sprag type one-way clutch is integrally formed on the side of the rolling bearing,
A one-way clutch raceway surface that is in contact with the outer peripheral side of each sprag of the one-way clutch is integrally formed on the axial side of the raceway surface of the outer ring of the rolling bearing, and the inner peripheral side of each sprag is The shaft is fitted to the inner peripheral surface of the inner ring of the rolling bearing, and a torque transmission operation is performed between the outer peripheral surface of the shaft and the one-way clutch raceway of the outer ring. A one-way clutch integrated with a rolling bearing.   2. The rolling bearing according to claim 1, wherein an outer diameter of a portion of the shaft that is in contact with an inner peripheral side of each sprag is substantially equal to an outer diameter of a portion that is fitted to the inner peripheral surface of the inner ring of the rolling bearing. Integrated one-way clutch. In a rolling bearing integrated one-way clutch in which a sprag type one-way clutch is integrally formed on the side of the rolling bearing,
A one-way clutch raceway surface that is in contact with the inner peripheral side of each sprag of the one-way clutch is integrally formed on the axial side of the raceway surface of the inner ring of the rolling bearing. The side is in contact with the inner peripheral surface of the housing to which the outer ring outer peripheral surface of the rolling bearing is fitted, and the torque is transmitted between the inner peripheral surface of the housing and the inner ring one-way clutch raceway surface. A rolling bearing integrated one-way clutch, characterized in that   4. The rolling bearing integrated one-way type according to claim 3, wherein an inner diameter of a portion of the housing where the outer peripheral side of each sprag contacts is substantially equal to an inner diameter of a portion where the outer ring outer peripheral surface of the rolling bearing is fitted. clutch.

Images