JP2006183755A - Power transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve lubricating performance; to prevent sedimentation of deteriorated lubricating oil; and to reduce costs of a device. <P>SOLUTION: A S-plug type one-way clutch 5, first and second rolling bearings 7 and 9 are arranged on an annular space between an outer ring 1 and inner ring 3, an opposite gap 11 between the one-way clutch 5 and first rolling bearing 7 is arranged by arranging the one-way clutch 5 one-sided to a second rolling bearing 9 direction, a spraying oil discharging hole 1a 1a arranged on the outer ring 1, and a hole inlet section 1a1 of the spraying oil discharging hole 1a is arranged on a bore side of the outer ring 1 facing the opposite gap 11 of the one-way clutch 5 and first rolling bearing 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power transmission device including a sprag type one-way clutch. The power transmission device according to the present invention is incorporated in an automobile pulley unit, an automatic transmission, an engine starter, and the like. This one-way clutch includes a sprag interposed between a radially outer member (outer ring) on one side of the drive side or driven side and a radially inner member (inner ring) on the other side, and the relative rotation of both members In response to the tilting motion of the sprags, the rotational power on one side of both members is transmitted to the other side or the transmission is blocked. In this specification, the state in which the sprags are engaged with both members and the two members are connected to rotate together and the rotational power is transmitted is referred to as the locked state, and the sprags are released from the engagement and rotated. A state where the transmission of power is interrupted is called a free state.

  Referring to FIG. 7, a conventional power transmission device having a sprag type one-way clutch will be described. This power transmission device has a sprag type one-way clutch 5 in an annular space between an outer ring 1 and an inner ring 3. And the first and second rolling bearings 7 and 9 are arranged on both sides of the one-way clutch 5 in the axial direction. The inner ring 3 is provided with a lubricating oil supply hole 3m. The hole inlet of the lubricating oil supply hole 3m is not shown. The hole outlet portion 3m1 is provided on the outer diameter surface of the inner ring 3 with which the sprag 5a of the one-way clutch 5 abuts. In such a power transmission device, as a conventional technique in which a sprag type one-way clutch 5 is interposed between the inner and outer rings 1 and 3 and a lubricating oil supply hole 3m is provided in the inner ring 3, see, for example, Patent Document 1. can do.

  In the power transmission device having the above configuration, for example, when the outer ring 1 rotates in one direction relative to the inner ring 3, the sprags 5a of the one-way clutch 5 are engaged with the outer ring 1 and the inner ring 3, The outer rings 1 and 3 are locked. When the outer ring 1 rotates in the other direction relative to the inner ring 3, the sprag 5a is released from the above-mentioned biting, and the inner and outer rings 1, 3 are in a free state.

However, in the above power transmission device, there is a problem that spray oil is difficult to smoothly flow in and out due to the rotation of the rolling bearings 7 and 9 and is easily influenced by the lubrication performance. Rotating centrifugal force acts on the spray oil, and there is a problem that the sprayed oil is not discharged to the outside and the deteriorated lubricating oil is easily deposited. Furthermore, the rolling bearings 7, 9 and the like are also subject to rotational resistance by the sprayed oil, and the rotational performance is easily affected. Furthermore, the lubricating oil supply hole 3m has a problem that it is necessary to provide an oil pipe from a lubricating oil supply pump (not shown) for forced lubrication, resulting in a large-scale device and high cost.
JP 2003-28203 A

  An object of the present invention is to improve lubrication performance, prevent the deposition of deteriorated lubricating oil, and reduce the cost of the apparatus.

  The power transmission device according to the present invention includes a sprag type one-way clutch for transmitting and blocking power between both wheels in an annular space between an outer ring and an inner ring, and an axial direction of the one-way clutch. In the power transmission device in which the first and second rolling bearings are arranged on both sides, the one-way clutch is arranged so as to be offset toward the second rolling bearing, and the opposing gap is provided between the one-way clutch and the first rolling bearing. A spray oil discharge hole penetrating in the radial direction in the outer ring, and the hole inlet portion of the spray oil discharge hole is provided on the inner diameter side of the outer ring facing the facing gap between the one-way clutch and the first rolling bearing. In addition, the hole outlet portions are respectively arranged on the outer diameter portions of the outer rings.

  The outer ring is a member on one side of driving or driven arranged radially outward, and the inner ring is a member on the other side of driving or driven arranged radially inside. The shape of the outer ring and the inner ring is not limited to a cylindrical shape, and can be formed in various shapes depending on the usage mode of the device in which the one-way clutch is incorporated. The inner ring may be a solid or hollow rotating shaft.

  According to the power transmission device of the present invention, since the spray oil discharge hole is located in the facing gap between the one-way clutch and the first rolling bearing, the spray oil discharge hole is disposed on both sides in the axial direction with respect to the spray oil discharge hole. Since the rotation of the rolling bearing acts to allow the spray oil to flow toward the spray oil discharge hole, the lubrication performance is greatly improved. In addition, even if rotational centrifugal force acts on the spray oil, since the spray oil discharge hole is provided in the direction of the rotational centrifugal force, the spray oil is smoothly discharged to the outside. It is possible to prevent the deteriorated lubricating oil from being deposited inside. Further, since the spray oil smoothly flows in one direction into the rolling bearings on both sides in the axial direction with respect to the spray oil discharge hole, the rotational resistance received from the spray oil can be reduced as compared with the conventional one, and the rotation performance can be reduced. Can be improved. Furthermore, since it is not necessary to provide oil piping from a lubricating oil supply pump (not shown) in the lubricating oil supply hole for forced lubrication, the cost of the apparatus can be reduced.

  The power transmission device according to the present invention includes a stepped outer ring having a small diameter on one side in the axial direction and a large diameter on the other side in the axial direction, an inner ring with a step having a small diameter on one side in the axial direction and a large diameter on the other side in the axial direction, A first rolling bearing is disposed in the small-diameter annular space, and a sprag type one-way clutch and a second rolling bearing are disposed in the large-diameter annular space between the two wheels from one axial end to the other axial side. In the arranged power transmission device, the second rolling bearing is arranged on the other axial side of the first rolling bearing in the small-diameter side annular space, and the one-way clutch is arranged so as to be offset toward the other axial side, and the small-diameter side annular is arranged. A counter gap is provided between the boundary between the space and the large-diameter side annular space and the one-way clutch, while a spray oil discharge hole penetrating in the radial direction is provided in the outer ring, and a hole inlet portion of the spray oil discharge hole is opposed to the counter ring. On the inner diameter side of the outer ring facing the gap, It is characterized in that it has arranged the outlet portion on the outer diameter side of the outer ring.

  According to the power transmission device of the present invention, by providing the spray oil discharge hole in the outer ring, the rotation of the first and second rolling bearings arranged on both sides in the axial direction with respect to the mist oil discharge hole, Since it acts so that spray oil may flow in toward the spray oil discharge hole, the lubrication performance is improved. Also, even if rotational centrifugal force acts on the spray oil, the spray oil discharge hole is provided in the direction of the rotational centrifugal force, so the spray oil can be smoothly discharged to the outside. Spent and deteriorated lubricating oil is prevented from being deposited inside. Furthermore, since the spray oil smoothly flows in one direction into the rolling bearings on both axial sides with respect to the spray oil discharge hole, the rotational resistance received from the spray oil can be reduced, and the rotational performance can be improved. Can do. Furthermore, since it is not necessary to provide oil piping from the lubricating oil supply pump in the lubricating oil supply hole for forced lubrication, the cost of the apparatus can be reduced.

  According to the present invention, it is possible to improve the lubricating performance, prevent the deposition of deteriorated lubricating oil, and reduce the cost of the apparatus.

  Hereinafter, a power transmission device including a sprag type one-way clutch (hereinafter referred to as a one-way clutch) according to an embodiment of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a front sectional view of the power transmission device, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a partial perspective view of an outer ring, and FIG. 4 is a spray inside the power transmission device. FIG. 2 is a cross-sectional view showing the flow of oil and corresponding to FIG. 1. The power transmission apparatus according to the first embodiment shown in these drawings includes a power transmission medium that mediates transmission of power between the outer ring 1 that is a power transmission wheel, the inner ring 3 that is a power transmitted wheel, and both wheels 1 and 3. A one-way clutch 5 as a member, and first and second rolling bearings 7 and 9 disposed on both sides in the axial direction with respect to the one-way clutch 5 are provided.

  The outer ring 1 is provided with a spray oil discharge hole 1a penetrating in the radial direction.

  The inner ring 3 is not provided with a conventional lubricating oil supply hole.

  The one-way clutch 5 is arranged so as to be offset toward the second rolling bearing 9, and an opposing gap 11 is provided between the one-way clutch 5 and the first rolling bearing 7.

  The one-way clutch 5 includes a plurality of sprags 5a arranged at equal intervals in the circumferential direction between the inner and outer rings 1 and 3, an outer cage 5b and an inner cage 5c that hold the sprags 5a, and an outer cage 5b. An annular ribbon spring 5d is disposed between the inner cage 5c and biases the sprag 5a toward the lock side.

  The sprag 5a is engaged with the outer ring 1 and the inner ring 3 so that the outer ring 1 and the inner ring 3 are in a locked state so that the rotational power of the outer ring 1 can be transmitted to the inner ring 3, and the engagement state is released. The inner ring 3 is brought into a free state of relative rotation, and transmission of rotational power from the outer ring 1 to the inner ring 3 is interrupted. The outer cage 5b, the inner cage 5c, and the ribbon spring 5d have pocket holes 5b1, 5c1, and 5d1, respectively. The outer cage 5b has a radially outward flange portion 5b2, and the inner cage 5c has a radially inward flange portion 5c2.

  In the one-way clutch 5 having the above-described configuration, when the outer ring 1 rotates, for example, in one direction, the sprag 5a is brought into frictional contact with the outer ring, and is tilted in a standing direction while being urged by the elasticity of the ribbon spring 5d. The inner and outer rings 1 and 3 are engaged with each other so as to be integrally rotatable. By this connection, the rotational power of the outer ring 1 is transmitted to the inner ring 3. When the outer ring 1 rotates in the other direction, the sprag 5a is tilted in the direction opposite to the above-mentioned direction of engagement against the elasticity of the ribbon spring 5d and the engagement is released, and the inner and outer rings 1, 3 are relatively rotated. Make it possible. As a result, the rotational torque of the outer ring 1 is not transmitted to the inner ring 3, and power transmission between the inner and outer rings 1 and 3 is interrupted.

  In the power transmission device described above, the one-way clutch is arranged so as to be offset toward the second rolling bearing 9 to provide the opposing gap 11 between the one-way clutch 5 and the first rolling bearing 7, while the outer ring 1 Is provided with a spray oil discharge hole 1a penetrating in the radial direction, and the hole entrance portion 1a1 of the spray oil discharge hole 1a faces the clearance 11 between the one-way clutch 5 and the first rolling bearing 7 on the inner diameter side of the outer ring 1 In addition, the hole outlet portion 1a2 is disposed on the outer diameter side of the outer ring 1, respectively.

  The spray oil discharge hole 1 a is provided in a straight line in the radial direction from the inner diameter side to the outer diameter side of the outer ring 1. The spray oil discharge hole 1a can be provided so as to be inclined in the axial direction without being provided in a linear shape in the radial direction as described above. The spray oil discharge hole 1a has a uniform inner diameter from the hole inlet 1a1 to the hole outlet 1a2. The inner diameter of the spray oil discharge hole 1a can be changed midway. The number of spray oil discharge holes 1a is not limited to one, and a plurality of spray oil discharge holes 1a can be provided. The spray oil discharge hole 1a can be internally communicated with a plurality of hole inlet portions 1a1. The material of the outer ring 1 and the inner ring 3 is not particularly limited. Even if the outer ring 1 and the inner ring 3 are cylindrical, they can have various shapes on both sides in the axial direction. For example, the outer ring 1 can be configured to have an L-shaped section or the like by providing flange portions inside and outside in the radial direction on one axial side or both axial sides. The inner ring 3 may be a shaft body.

  In the power transmission device having the above configuration, when the inner ring 3 rotates at a high speed, the facing gap 11 sandwiched between the rolling bearings 7 and 9 is placed under a negative pressure in the atmosphere, as shown in FIG. Spray oil flows from both sides in the axial direction into the opposing gap 11 via both rolling bearings 7 and 9 as indicated by an arrow P1, and the spray oil that has flowed in is subjected to a high rotational centrifugal force, and the arrow As indicated by P2, the oil is discharged from the spray oil discharge hole 1a.

  As described above, in the first embodiment, since the spray oil discharge hole 1a is located in the opposed gap 11 between the one-way clutch 5 and the first rolling bearing 7, the spray oil discharge hole 1a has a shaft relative to the spray oil discharge hole 1a. Since the rotation of the rolling bearings 7 and 9 arranged on both sides in the direction acts to allow the spray oil to flow toward the spray oil discharge hole 1a, the lubrication performance is greatly improved. Further, even if the rotational centrifugal force acts on the spray oil, the spray oil discharge hole 1a is provided in the direction of the rotational centrifugal force, so that the spray oil is smoothly discharged to the outside. It is possible to prevent the lubricating oil deteriorated in step 1 from being deposited inside. Further, since the spray oil smoothly flows in one direction into the rolling bearings 7 and 9 on both axial sides with respect to the spray oil discharge hole 1a, the rotational resistance of the rolling bearings 7 and 9 should be reduced as compared with the prior art. The rotation performance can be improved. Furthermore, since it is not necessary to provide oil piping from a lubricating oil supply pump (not shown) in the lubricating oil supply hole 1a for forced lubrication, the cost of the apparatus can be reduced.

(Embodiment 2)
A power transmission apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view of a power transmission device that is not known but is under development by the applicant of the present application, and FIG. The power transmission device in FIG. 6 is the power transmission device according to the second embodiment. In the power transmission device shown in FIG. 5, the outer ring 1 has a step with an axial one side track portion 1b having a small diameter and an axial other side track portion 1c having a large diameter. An outer ring side step wall surface 1d is formed at the boundary between both the track portions 1b and 1c.

  The inner ring 3 has a step having a small diameter in the axial one side track portion 3a and a large diameter in the other axial direction track portion 3b. An inner ring side step wall surface 3c is formed at the boundary between both the track portions 3a and 3b. A first rolling bearing 7 is disposed in the small-diameter side annular space 13 between the two wheels 1 and 3. A sprag type one-way clutch 5 and a second rolling bearing 9 are disposed in the large-diameter annular space 15 between the two wheels 1 and 3 from one axial end to the other axial side. The both rolling bearings 7 and 9 are deep groove type ball bearings, but may be other types of rolling bearings such as roller bearings.

  In the power transmission device shown in FIG. 5, in order to secure a required amount of power transmission capacity (torque capacity) of the one-way clutch 5, it is arranged in the large diameter side annular space 15 to have a large diameter. On the other hand, a second housing 17 is disposed on the outer diameter surface 1 e corresponding to the small-diameter side annular space 13 of the outer ring 1.

  The first rolling bearing 7 disposed in the small-diameter annular space 13 for supporting the second housing 17 has a short bearing width and a small bearing outer diameter. Therefore, a useless space 19 exists between the inner end surface 7a of the first rolling bearing 7 and the inner ring step wall surface 3c in the small-diameter side annular space 13. Further, when the lubricating oil is supplied from the other side in the axial direction, the presence of the second rolling bearing 9 makes it difficult for the lubricating oil to flow into the annular spaces 13 and 15 of the inner and outer rings 1 and 3, and the lubricating performance is low. . Further, since the second rolling bearing 9 is disposed in the large-diameter side annular space 15, it is necessary to use a large-diameter and high-cost bearing.

  In the power transmission device shown in FIG. 6, the second rolling bearing 9 is disposed in the waste space 19. With this arrangement, a small diameter and low cost bearing can be used as the second rolling bearing 9. ing. Further, the one-way clutch 5 is shifted to the other axial side, which is the space side where the second rolling bearing 9 is disposed, by the rearrangement of the second rolling bearing 9 in the small-diameter annular space 13. Are arranged.

  In the second embodiment, the outer ring 1 is provided with the spray oil discharge hole 1a, and the one-way clutch 5 is arranged to be offset toward the other side in the axial direction. A hole inlet 1a1 of the spray oil discharge hole 1a is provided on the inner diameter side of the outer ring 1 facing the installation space (corresponding to the facing gap in the first embodiment).

  In the second embodiment, in comparison with the power transmission device shown in FIG. 5, the inflow and outflow properties of the spray oil to the one-way clutch 5 are improved, and the lubrication performance for the one-way clutch 5 is improved. It is possible to use an inexpensive bearing by arranging the two rolling bearings 9 in the small-diameter annular space 13. Furthermore, in addition to this, by providing the outer ring 1 with the spray oil discharge hole 1a, first and second both rolling bearings 7, which are juxtaposed on one side in the axial direction with respect to the spray oil discharge hole 1a, Since the rotation of 9 acts so as to allow the spray oil to flow toward the spray oil discharge hole 1a, the lubrication performance for the rolling bearings 7 and 9 is improved. Further, the rotational centrifugal force acts on the spray oil flowing into the facing gap between the outer ring side step wall surface 1d and the one-way clutch 5, and the spray oil is provided in the direction in which the rotational centrifugal force acts. The spray oil can be smoothly discharged to the outside from the spray oil discharge hole 1a, and it is suppressed that used and deteriorated lubricating oil is deposited inside. Further, since the spray oil smoothly flows in and out of the rolling bearings 7 and 9 from the one axial side to the other axial side with respect to the spray oil discharge hole 1a, the rotational resistance received from the spray oil is reduced. The rotational performance can be improved. Furthermore, since it is not necessary to provide oil piping from a lubricating oil supply pump (not shown) in the lubricating oil supply hole 1a for forced lubrication, the cost of the apparatus can be reduced.

  In the above, the present invention is not limited to the above-described embodiment, but includes various modifications that do not exceed the scope of the claims.

It is sectional drawing of the power transmission device which concerns on Embodiment 1 of this invention. It is sectional drawing of the AA line of FIG. It is a perspective view of the outer ring | wheel of FIG. It is sectional drawing with which it uses for description of the flow of the spray oil in the power transmission device of FIG. It is sectional drawing of the power transmission device which this-application applicant who uses for description of Embodiment 2 is developing. FIG. 6 is a power transmission device according to an improvement of the power transmission device in FIG. 5, and is a cross-sectional view of the power transmission device having the same spray oil discharge holes as in the first embodiment. It is sectional drawing of the conventional power transmission device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 1a Spray oil discharge hole 1a1 Hole inlet part 1a2 Hole outlet part 3 Inner ring 5 One-way clutch 7 1st rolling bearing 9 2nd rolling bearing

Claims (2)

A sprag type one-way clutch is provided in the annular space between the outer ring and the inner ring to transmit and block power between the two wheels, and the first and second ones on both axial sides of the one-way clutch. In the power transmission device with rolling bearings,
While the one-way clutch is arranged offset in the direction of the second rolling bearing to provide an opposing gap between the one-way clutch and the first rolling bearing, a spray oil discharge hole penetrating in the radial direction is provided in the outer ring. The hole inlet portion of the spray oil discharge hole is disposed on the inner diameter side of the outer ring facing the gap between the one-way clutch and the first rolling bearing, and the hole outlet portion is disposed on the outer diameter side of the outer ring. A power transmission device characterized by. A stepped outer ring having a small diameter on one side in the axial direction and a large diameter on the other side in the axial direction; an inner ring with a step having a small diameter on the one side in the axial direction and a large diameter on the other side in the axial direction; In the power transmission device in which the rolling bearing is arranged, the sprag type one-way clutch and the second rolling bearing are arranged from the one axial end toward the other axial side in the large-diameter annular space between the two wheels.
The second rolling bearing is arranged on the other axial side of the first rolling bearing in the small-diameter side annular space, and the one-way clutch is arranged so as to be offset toward the other axial side, so that the small-diameter annular space and the large-diameter side annular space Between the boundary between the outer ring and the one-way clutch, while providing an outer ring with a spray oil discharge hole penetrating in the radial direction, and an inner diameter of the outer ring facing the counter gap between the hole inlet portion of the spray oil discharge hole A power transmission device characterized in that the hole outlet portion is disposed on the outer diameter side of the outer ring.

Images