JP2005188582A - Pulley unit with one-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulley unit with a one-way clutch, preventing deformation or interference with the bearing ring of a rolling bearing due to the clamp of the cage of one-way clutch when pressed in. <P>SOLUTION: Ball bearings 6, 7 are provided on both sides of the one-way clutch 5 in the axial direction, and the outer ring of the one-way clutch 5 is clamped between outer rings 6a, 7a of both ball bearings 6, 7. In the end of the cage 15 of the one-way clutch 5 on the side of the rolling bearing, cutout portions 19, 20 are provided for preventing the contact with the outer rings 6a, 7a of the rolling bearings 6, 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pulley unit with a one-way clutch used for a belt-driven starter in a belt transmission system that transmits a rotational force by a belt when starting an internal combustion engine and driving an auxiliary machine by the internal combustion engine, for example.

  An inner ring, an outer ring, a biting member arranged between both wheels, and a biasing member for biasing the biting member in the biting direction are provided between the shaft and a pulley arranged concentrically around the shaft. A pulley unit with a one-way clutch in which a one-way clutch is provided and rolling bearings are provided on both axial sides of the one-way clutch has been conventionally known as described in Patent Document 1, for example.

In Patent Document 1, the one-way clutch and the rolling bearing are positioned in the axial direction by contacting each other.
JP 2001-208100 A

  In the conventional pulley unit with a one-way clutch, there is no gap between the cage of the one-way clutch and the bearing ring (outer ring or inner ring) of the rolling bearing. There has been a problem that it is sandwiched between the bearing rings of the rolling bearing and deformed, or interferes with the bearing ring of the rolling bearing.

  An object of the present invention is to provide a pulley unit with a one-way clutch capable of preventing deformation due to pinching when a cage of a one-way clutch is press-fitted and interference with a bearing ring of a rolling bearing.

  The pulley unit with a one-way clutch according to the present invention includes a biting member and a biting member arranged between an inner ring, an outer ring, and both wheels between a shaft and a pulley arranged concentrically around the shaft. In a pulley unit with a one-way clutch provided with a one-way clutch provided with a biasing member for biasing to and provided with a rolling bearing on at least one side in the axial direction of the one-way clutch, the rolling of the cage of the one-way clutch The bearing side end is provided with a notch for preventing contact with the bearing ring of the rolling bearing.

  The one-way clutch may have an outer ring that is a member different from the pulley and an inner ring that is a member different from the hollow shaft, and an intermediate portion of the pulley is an outer ring of the one-way clutch. The intermediate part of the one-way clutch may be the inner ring of the one-way clutch.

  In the case of the former (the outer ring and inner ring of the one-way clutch are separate members from the pulley or hollow shaft), for example, the inner diameter of the pulley and the outer diameter of the hollow shaft are the same except for the annular groove portion for the seal member. The outer ring and the inner ring are positioned in the axial direction by abutting against the outer ring and the inner ring of the one-way clutch at the time of press-fitting. Further, the radial positioning of the cage is performed by press-fitting the outer diameter of the cage into the outer ring of the one-way clutch, and the axial positioning of the cage is, for example, an outward direction provided in the cage. The flange portion is inserted into an annular recess provided in the outer ring of the one-way clutch. And the notch part of a holder | retainer is provided in the part facing the outer ring | wheel of a rolling bearing.

  In the latter case (the pulley also serves as the outer ring of the one-way clutch and the hollow shaft also serves as the inner ring), for example, the inner diameter of the pulley is formed in a stepped shape in which both ends are larger in diameter than the intermediate part. The outer ring is positioned by the step portion of the pulley, and the inner ring of the bearing is positioned by positioning the outer ring. Further, the radial positioning of the cage is performed by press-fitting the outer diameter of the cage into a portion corresponding to the one-way clutch outer ring of the pulley, and the axial positioning of the cage is positioned on both sides of the one-way clutch. This is done by the outer ring of the bearing. And the notch part of a holder | retainer is provided in the part facing the inner ring | wheel of a rolling bearing.

  According to the pulley unit with a one-way clutch of the present invention, the one-way clutch is provided with a notch for preventing contact with the raceway of the rolling bearing at the rolling bearing side end of the cage of the one-way clutch. The cage of the one-way clutch is not in contact with the bearing ring of the rolling bearing even if it is mounted so that there is no gap between the rolling bearing and the rolling bearing. Interference with the ring is prevented.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the left and right refer to the left and right in FIG.

  1 and 2 show a first embodiment of a pulley unit with a one-way clutch according to the present invention. This one-way clutch-equipped pulley unit (1) is arranged at a portion connecting the engine drive unit and the rotation shaft of the starter motor, and is a hollow shaft (3) fitted to the rotation shaft (3) of the starter motor. ) And a pulley (4) arranged concentrically therewith, a one-way clutch (5) is provided. On the outer periphery of the pulley (4), there is provided a belt spanning portion (4a) on which the V-ribbed belt (B) is spanned.

  As shown in FIG. 1, the outer diameter of the hollow shaft (3) and the inner diameter of the pulley (4) are both straight (the same diameter except for the annular groove portion for the seal members (8) and (9)). ing. The one-way clutch (5) is provided between the axial intermediate portion of the hollow shaft (3) and the axial intermediate portion of the pulley (4), and the left end portion of the hollow shaft (3) and the pulley Ball bearings (6) and (7) are provided between the portion near the left end of (4) and between the portion near the right end of the hollow shaft (3) and the portion near the right end of the pulley (4), respectively.

  As will be described later, the one-way clutch (5) is composed of an outer ring (5a), an inner ring (5b), a roller (13), a coil spring (14) and a cage (15). 7) is composed of outer rings (6a) (7a), inner rings (6b) (7b), balls (6c) (7c) and cages (6d) (7d), respectively. The outer ring (5a) of the one-way clutch (5) is sandwiched between both outer rings (6a) and (7a) of the ball bearings (6) and (7), and the inner ring (5b) of the one-way clutch (5) is It is sandwiched between both inner rings (6b) and (7b) of each ball bearing (6) and (7). Seal members (8) and (9) are arranged on the outer sides in the axial direction of the ball bearings (6) and (7), respectively.

  As shown in FIG. 2, the one-way clutch (5) is formed by a cam surface (11) provided on the inner peripheral surface of the outer ring (5a), and an outer peripheral surface of the cam surface (11) and the inner ring (5b). The inner ring (5b) and the outer ring (5a) are meshed between the inner ring (5b) and the outer ring (5a) by rotating relative to each other in one direction (locking direction). Roller (13) as a plurality of biting members that release bite when rotated relative to the other direction (free direction) and the biting direction of roller (13) (narrow side of wedge-shaped space (12)) A coil spring (14) as an urging member for urging the roller (13), and a cage (15) for positioning the roller (13) in the wedge-shaped space (12).

  The cam surface (11) is configured by providing a plurality of sets (four sets in this embodiment) in the circumferential direction with two surfaces (11a), (11b), (11c), and (11d) facing each other across the axis. . The two faces (11a), (11b), (11c), and (11d) are not perpendicular to the normal (19) that passes through the center and axis of the roller (13), but have an acute angle that is slightly smaller than the right angle. ing.

  At the end of the wide side of the wedge-shaped space (12) of the two surfaces (11a), (11b), (11c), and (11d), a holding concave surface that stops the roller (13) that has a circular cross section and receives centrifugal force. A part (16) is provided.

  The coil spring (14) has an elliptical shape having a central axis in a cross section and having the major axis direction aligned with the axial direction of the one-way clutch (5). The length of the short diameter, that is, the radial dimension of the portion in contact with the roller of the spring is made smaller than the diameter of the roller (13).

  The cage (15) is made of synthetic resin and has an outer peripheral shape substantially along the cam surface (11) and an inner peripheral shape along the outer peripheral surface of the inner ring (5b), and is press-fitted into the cam surface (11). Has been. A slight gap is provided between the inner diameter of the cage (15) and the outer diameter of the inner ring (5b) to prevent the cage (15) and the inner ring (5b) from contacting each other. The inner diameter of the cage (15) is larger than the outer diameter of the inner rings (6b) (7b) of the left and right ball bearings (6) (7), and the cage (15) and the left and right ball bearings (6) Contact with the inner rings (6b) and (7b) of (7) is also prevented. The cage (15) is provided with a spring receiving recess (17) for positioning the coil spring (14). Grease is enclosed in the spring receiving recess (17).

  The spring receiving recess (17) is connected to the roller holding concave surface portion (16) of the cam surface (11) by the spring positioning surface (18) provided on the inner periphery of the outer ring (5a), and the coil spring (14). The central axis direction is kept constant. The central axis of the coil spring (14) is tangent to the outer peripheral surface of the inner ring (5b) so that it can be deformed in a direction that reduces the urging force against the roller (13) when centrifugal force acts on the coil spring (14). It is inclined with respect to the direction. As with the cam surface (11), the outer ring (5a) spring positioning surface (18) is provided with a plurality of sets of two surfaces formed opposite to each other across the axis of the one-way clutch (5). Is made up of.

  The spring receiving recess (17) includes a spring end positioning surface (17a) that prevents the coil spring (14) from moving in the spring axis direction, and the coil spring (14) moves inwardly perpendicular to the spring axis. The spring positioning surface (18b) of the outer ring (5a) prevents the coil spring (14) from moving perpendicularly to the spring axis. It is a spring outer positioning surface for blocking. By these spring positioning surfaces (17a), (17b) and (18), the central axis of the coil spring (14) is kept perpendicular to the central axis of the roller (13).

  A roller holding inclined surface (17c) is provided continuously to the spring inner positioning surface (17b) of the spring receiving recess (17). The other end of the inclined surface (17c) has a slight gap with respect to the outer peripheral surface of the inner ring (5b). Roller moved in the biting release direction by the roller holding concave surface portion (16) which is the roller holding surface of the outer ring (5a) and the roller holding inclined surface (17c) which is the roller holding surface of the cage (15) ( 13) A roller holding portion having a substantially C-shaped cross section for receiving and holding is formed.

  FIG. 2 shows a state in which no centrifugal force is applied to the roller (13) and the coil spring (14). When the inner ring (5b) is rotated counterclockwise in this state, the roller (13) is moved to the inner ring. (5b) is caught between the outer ring (5a) and the inner ring (5b) and the outer ring (5a) rotate together. When the pulley (4) and hence the outer ring (5a) are rotated at a high speed, and the rotation of the inner ring (5b) and thus the hollow shaft (3) is stopped, the direction of the centrifugal force acting on the rollers (13) (reference numeral (19)) The direction of the line shown (outward direction) is different from the normal direction at the point where (13) is in contact with the two surfaces (11a) (11b) (11c) (11d). A force in the direction along the two surfaces (11a), (11b), (11c), and (11d) is applied, so that the roller (13) moves to the wide side of the wedge-shaped space (12).

  In this state, the concave portion (16), which is the roller holding surface of the outer ring (5a), is a concave surface having a circular cross section having a radius substantially the same as the radius of the outer peripheral surface of the roller (13), and thus has a cylindrical surface. Since the outer peripheral part of the roller (13) is just fit in this concave surface part (16), and since the inclined surface (17c) which is the roller holding surface of the cage (15) is applied from the radially inner side, the roller ( 13) does not tilt, and a clearance between the inner ring (5b) and the outer periphery (13) is secured, and a non-contact state with the inner ring (5b) and (13) is achieved.

  As shown in FIG. 1, an outward flange portion (21) is formed at the right end portion of the cage (15) of the one-way clutch (5), and this flange portion (21) is formed on the outer ring (5a). The cage (15) is prevented from moving in the axial direction and the radial direction by being fitted into an annular recess (22) provided in the inner diameter of the right end of the cage. The axial length of the cage (15) is the same as the axial length of the outer ring (5a) and the inner ring (5b). The left end of the cage (15) is in contact with the outer ring (6a) of the ball bearing (6) on the radially outer portion facing the right end surface of the outer ring (6a) of the left ball bearing (6). A notch (19) is provided for preventing the above. Further, at the right end portion of the cage (15), the outer ring (7a) of the ball bearing (7) and the outer ring (7a) of the ball bearing (7) are arranged on the radially outer portion facing the left end surface of the outer ring (7a) of the right ball bearing (7). A notch (20) is provided for preventing the contact.

  When assembling the pulley unit (1), for example, the right ball bearing (7), the one-way clutch (5), and the left ball bearing (6) are press-fitted in this order, but the inner diameter of the pulley (4) is Because it is straight, the outer ring (5a) of the one-way clutch (5) is sandwiched between the outer rings (6a) (7a) of the left and right ball bearings (6) (7) regardless of the press-fitting order. The inner ring (5b) of the direction clutch (5) is sandwiched between the inner rings (6b) and (7b) of the left and right ball bearings (6) and (7). Accordingly, the radially outer portion of the left end of the cage (15) facing the end surface of the outer ring (6a) of the left ball bearing (6) and the outer ring (7a) of the right ball bearing (7) The radially outer portion of the right end of the cage (15) facing the end face may contact and deform or interfere with the outer ring (6a) (7a) of the corresponding ball bearing (6) (7). However, as described above, the left and right ends of the cage (15) are provided with notches (19) and (20) to prevent this, respectively, so that the cage (15) is not deformed or interfered with. Is prevented.

  This one-way clutch-equipped pulley unit operates as follows.

  First, at the time of starting, the hollow shaft (3) integrated with the rotation shaft (2) of the starter motor is rotated counterclockwise. As a result, the inner ring (5b) of the one-way clutch (5) rotates counterclockwise, and the roller (13) is engaged with the narrow side of the wedge-shaped space (12) of the one-way clutch (5), and the driving force is increased. As a result, the inner ring (5b) and the outer ring (5a) of the one-way clutch (5) rotate as a unit, and thus the hollow shaft (3) and the pulley (4) rotate as a unit. The pulley (4) is connected to the crankshaft via a belt, and the engine is started by the rotation of the pulley (4). When the engine starts, the starter stops and the pulley (4) continues to rotate counterclockwise. As a result, the biting of the roller (13) is released, and the state where only the pulley (4) and the outer ring (5a) of the one-way clutch (5) rotate continues. In particular, when the engine rotates at high speed, the roller (13) is positioned by the concave surface portion (16) having substantially the same curvature as the roller (13) and is in a non-contact state with the inner ring (5b). The coil spring (14) receives a force in the direction of contraction due to the centrifugal force due to the pulley (4) having a predetermined rotational speed or more, and the elastic force that biases the roller (13) in the biting direction is reduced. 13) A non-contact state between the inner ring (5b) is ensured. Since the moving direction of the roller (13) when centrifugal force is applied and the central axis direction of the coil spring (14) coincide, the coil spring (14) is displaced when the roller (13) moves. The direction of the urging force of the coil spring (14) when the pulley (4) stops does not change, and the problem that the roller (13) cannot be moved to the biting side does not occur. Thus, at the time of start-up, the roller (engagement member) (13) and the coil spring (biasing member) (14) rotate integrally with the outer ring (5a), that is, the pulley (4), and then the pulley (4 ) Exceeds the specified rotational speed, only the pulley (4) and the outer ring (5a) of the one-way clutch (5) rotate, and energy loss due to rotation of the part that does not contribute to engine drive is suppressed. be able to.

  FIG. 3 shows a second embodiment of the pulley unit with a one-way clutch according to the present invention. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  This one-way clutch-equipped pulley unit (31) includes a one-way clutch (31) between a hollow shaft (33) fitted to the rotation shaft (2) of the starter motor and a pulley (34) arranged concentrically therewith. 35) is provided, and the one-way clutch (35) is provided between the axial intermediate portion of the hollow shaft (33) and the axial intermediate portion of the pulley (34). Ball bearings (36) (37) between the portion near the left end of 33) and the portion near the left end of pulley (34) and between the portion near the right end of hollow shaft (33) and the portion near the right end of pulley (34), respectively. ) Is provided. The inner diameter part of the intermediate part of the pulley (34) also serves as the outer ring of the one-way clutch (35), and the outer diameter part of the middle part of the hollow shaft (33) also serves as the inner ring of the one-way clutch (35). Yes.

  The inner diameter of the pulley (34) is formed in a stepped shape in which the left and right end portions (large diameter portion) (34a) (34b) are larger in diameter than the intermediate portion (small diameter portion) (34c). The outer diameter of 33) is the same except for the annular groove portion for the seal member (40).

  The one-way clutch (35) includes an intermediate part (34c) of a pulley (34) as an outer ring, an intermediate part of a hollow shaft (33) as an inner ring, a roller (13), a coil spring (not shown), and a cage (45 The left and right ball bearings (36) and (37) are respectively an outer ring (36a) (37a), an inner ring (36b) (37b), a ball (36c) (37c) and a cage (36d) (37d). Consists of.

  The outer rings (36a) and (37a) of the left and right ball bearings (36) and (37) have the outer diameters equal to the inner diameters of the left and right ends (34a) and (34b) of the pulley (34). The inner ring (36b) (37b) is press-fitted into the left and right ends of the hollow shaft (33) with the inner diameter being equal to the outer diameter of the hollow shaft (33).

  Seal members (38) and (39) are arranged at the left end of the left ball bearing (36) and the right end of the right ball bearing (37), respectively. The free end side of the pulley unit (the left end side in the figure) In order to prevent intrusion of muddy water into the pulley unit, another seal member (40) is arranged between the left end of the hollow shaft (33) and the left end of the pulley (34). Yes.

  Although not shown (see FIG. 2), the one-way clutch (35) has a cam surface (11) provided on the inner peripheral surface of the intermediate portion (outer ring) of the pulley (34). The roller (13) as a member is disposed in a wedge-shaped space (12) formed by this cam surface (11) and the outer peripheral surface of the hollow shaft (33) intermediate portion (inner ring). As in the first embodiment, the inner ring and the outer ring rotate relative to each other in one direction (locking direction), so that the roller (13) is caught between the inner ring and the outer ring, and the other direction (free) The bite is released when it rotates relative to the direction.

  The cage (45) is made of synthetic resin and has an outer peripheral shape substantially along the cam surface (11) and an inner peripheral shape along the outer peripheral surface of the middle portion of the hollow shaft (33). ) Is press-fitted in. There is a slight gap between the inner diameter of the cage (45) and the outer diameter of the middle part of the hollow shaft (33) to prevent the cage (45) and the hollow shaft (33) from contacting each other. Has been.

  The cage (45) is formed symmetrically, and its outer diameter is press-fitted into the pulley intermediate part (34c), thereby preventing radial movement and its left end face on the left side. By facing the right end surface of the outer ring (36a) of the ball bearing (36) with substantially no gap, the right end surface is also spaced from the left end surface of the outer ring (37a) of the right ball bearing (37). The movement in the axial direction is prevented by facing each other in a state where there is substantially no. The axial length of the cage (45) is the same as the axial length of the pulley intermediate portion (34c). The left end of the cage (45) is in contact with the inner ring (36b) of the ball bearing (36) on the radially inner portion facing the right end surface of the inner ring (36b) of the left ball bearing (36). A notch (49) is provided to prevent this. Further, at the right end portion of the cage (45), the inner ring (37b) of the ball bearing (37) is connected to the radially inner portion facing the left end surface of the inner ring (37b) of the right ball bearing (37). A notch (50) is provided for preventing the contact.

  When assembling the pulley unit (31), for example, the right ball bearing (37), the one-way clutch (35), and the left ball bearing (36) are press-fitted in this order, but the inner diameter of the pulley (34) is Because of the stepped shape, the outer rings (36a) and (37a) of the ball bearings (36) and (37) are formed by stepped portions at both ends of the intermediate portion (34c) of the pulley (34) regardless of the press-fitting order. Further movement is prevented, thereby preventing deformation and interference of the parts of the cage (45) facing the outer rings (36a) and (37a) of the ball bearings (36) and (37). On the other hand, when the inner ring (36b) (37b) of the ball bearing (36) (37) is press-fitted, there is no step portion for positioning the inner ring (36b) of the left ball bearing (36). The radially inner portion of the left end of the cage (45) facing the right end surface and the right end of the cage (45) facing the left end surface of the inner ring (37b) of the right ball bearing (37) The radially inner portion may come into contact with the inner rings (36b) and (37b) of the corresponding ball bearings (36) and (37) to deform or interfere with each other. In the second embodiment, as described above, the left and right ends of the retainer (45) are provided with the notches (49) and (50) to prevent this, so that the retainer (45) Deformation and interference are prevented.

  In the first and second embodiments, the coil spring is shown as the means for urging the roller (13). However, a plate spring or the like may be used instead of the coil spring. Further, in the above description, the outer ring cam type one-way clutch (5) in which the cam surface (11 is formed on the inner peripheral surface of the outer ring (5a) has been described, but the rolling bearing is provided at the end of the cage of the one-way clutch. The technology for providing a notch for preventing contact with the raceway is such that the one-way clutch is an inner ring cam type, that is, the cam surface provided on the outer peripheral surface of the inner ring, the cam surface and the inner peripheral surface of the outer ring. Are arranged in a wedge-shaped space formed by the inner ring and the outer ring, and the inner ring and the outer ring are engaged with each other in a relative direction so that the inner ring and the outer ring are engaged with each other. It can also be applied to those equipped with a roller as a biting member and a coil spring as a biasing member that biases the roller in the biting direction (narrow side of the wedge-shaped space). The end of the vessel faces the end surface of the inner ring of the rolling bearing. A notch for preventing contact with the inner ring of the rolling bearing is provided in the radially inner portion.

FIG. 1 is a longitudinal sectional view showing a first embodiment of a pulley unit with a one-way clutch according to the present invention. FIG. 2 is a cross-sectional view of the same. FIG. 3 is a longitudinal sectional view showing a second embodiment of the pulley unit with one-way clutch according to the present invention.

Explanation of symbols

(1) Pulley unit with one-way clutch
(3) Hollow shaft
(4) Pulley
(5) One-way clutch
(5a) Inner ring
(5b) Outer ring
(6) (7) Ball bearing
(13) Roller (biting member)
(15) Cage
(19) (20) Notch
(31) Pulley unit with one-way clutch
(33) Hollow shaft
(34) Pulley
(35) One-way clutch
(36) (37) Ball bearing
(45) Cage
(49) (50) Notch

Claims (1)

An inner ring, an outer ring, a biting member arranged between both wheels, and a biasing member for biasing the biting member in the biting direction are provided between the shaft and a pulley arranged concentrically around the shaft. In the pulley unit with a one-way clutch provided with a one-way clutch and provided with a rolling bearing on at least one side in the axial direction of the one-way clutch,
A pulley unit with a one-way clutch, characterized in that a notch for preventing contact with a bearing ring of a rolling bearing is provided at an end of the one-way clutch cage on the side of the rolling bearing.

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