JP2007100861A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device, which can be incorporated in an installation space limited in the axial direction of a power transmission device incorporating arrangement, and in which lubricating performance is improved. <P>SOLUTION: A first raceway member 5 is arranged on the outer diameter side of a shaft member 1 via a roller bearing (a rolling bearing) 3, and a second raceway member 9 is arranged on the outer diameter side of the first raceway member 5 via a sprag type one-way clutch 7. A first flange part 11 is provided at one axial end side of the first raceway member 5 in opposition to one axial end side of the second raceway member 9 with a gap, and a second flange part 13 is provided on the other axial end side of the second raceway member in opposition to the other axial end side of the first raceway member 5 with a gap. The second flange part 13 is connected to the shaft member 1 in an integrally rotatable manner. The opposed gaps between the members form a lubricating oil passage 15 communicated with the outer diameter side through the inner diameter side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power transmission device including a 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, for example, a sprag that is interposed between a first track member that is one side of the drive side or the driven side and a second track member that is the other side, and responds to relative rotation of both track members. By rotating the sprags, the rotational power on one side of both track members is transmitted to the other side, or the transmission is blocked. In the present specification, a state in which a member for performing transmission switching of the one-way clutch, for example, a sprag is engaged with both the track members and the both track members are integrally connected to each other to transmit rotational power is referred to as a locked state. In other words, the state in which the above-mentioned biting of the sprag is released and the transmission of the rotational power is interrupted is referred to as a free state.

  In a conventional power transmission device having a one-way clutch, a one-way clutch is interposed between two facing race members, and rolling bearings are arranged on both sides in the axial direction of the one-way clutch. There is one that performs transmission and interruption of power between both raceway members by the operation (see Patent Document 1).

Various engine peripherals and related devices (referred to as engine peripheral devices for convenience of explanation) such as pulley units, automatic transmissions, and engine starters installed in automobiles transmit power as the axial width is shortened. In some cases, the installation space of the apparatus cannot be secured widely in the axial direction. In such a case, the power transmission device disclosed in Patent Document 1 is difficult to incorporate into such an engine peripheral device. Further, as the one-way clutch or rolling bearing of the power transmission device rotates, the lubricating oil tends to be biased radially outward due to the rotational centrifugal force. There is a risk of insufficient lubrication of bearing components.
JP-A-2-113131

  The present invention makes it possible to install a power transmission device in the engine peripheral device even in a situation where it is difficult to secure a space for installing the power transmission device in the axial direction in the engine peripheral device in which the power transmission device is incorporated, and Improving the lubrication performance inside the power transmission device is a problem to be solved.

  In the power transmission device according to the present invention, the first race member is disposed on the outer diameter side of the shaft member via a rolling bearing, and the second race member is disposed on the outer diameter side of the first race member via a one-way clutch. A first flange portion is provided on one end side in the axial direction of the first track member so as to extend annularly outward in the radial direction and is opposed to one end side in the axial direction of the second track member with a gap therebetween. A second flange portion is provided on the other end side that extends inward in the radial direction and faces the other end side in the axial direction of the first track member with a gap therebetween, and the second flange portion can be rotated integrally with the shaft member. A lubricating oil passage that is connected to communicate from the inner diameter side to the outer diameter side is formed.

  According to the present invention, since the one-way clutch and the rolling bearing are arranged in the radial direction via the first race member, the axial direction of the power transmission device is larger than the case where the one-way clutch and the rolling bearing are arranged in the axial direction. Even if the built-in width of the power transmission device cannot be secured widely in the axial direction due to design restrictions, etc. in various devices such as pulley units and automatic transmissions in automobiles, the power can be reduced. The transmission device can be easily installed. Further, in the power transmission device described above, a lubricating oil passage that is communicated from the inner diameter side to the outer diameter side is configured. Therefore, when a rotational centrifugal force acts on the lubricating oil as the power transmission device is operated, the lubricating oil is not lubricated. The oil passage can smoothly flow in and out radially outward, and the risk of insufficient lubrication of each component such as a rolling bearing and a one-way clutch inside the power transmission device is greatly reduced.

  As described above, according to the present invention, power transmission is performed even in a situation where it is difficult to secure a space for installing the power transmission device in the axial direction inside a device in which the power transmission device is incorporated, for example, an engine peripheral device. The device can be installed, and even when installed in such a space, the lubricating oil can be smoothly supplied into the power transmission device.

  In the above, when the rolling bearing is a roller bearing and the first race member is constituted by the outer ring of the roller bearing, it is only necessary to heat-treat the second race member and the shaft member.

  In the above, when the rolling bearing is a roller bearing and the first raceway member is used as both the outer ring of the roller bearing and the inner ring engaged with the sprag of the one-way clutch, the outer ring of the roller bearing and the sprag The parts cost, heat treatment cost, and assembly cost can be reduced as compared with the case where the inner ring for engaging the inner diameter side is separately manufactured and separately assembled.

  According to the present invention, it is possible to install the power transmission device in a situation where it is difficult to secure a space for installing the power transmission device in the axial direction inside the device in which the power transmission device is incorporated. Even if it is installed, the lubricating oil can be smoothly supplied into the power transmission device.

  Hereinafter, a power transmission device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. This power transmission device will be described as being incorporated in an engine peripheral device of an automobile. However, in a device or machine other than an automobile, the power transmission device that transmits and interrupts power between two track members is also used. Can be applied.

(Embodiment 1)
A power transmission apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a front sectional view of the power transmission device, and FIG. 2 is a side sectional view taken along line AA in FIG. The left side of FIG. 1 is one axial end side, and the right side is the other axial end side.

  Referring to these drawings, shaft member 1 as a shaft for transmitting rotational power is made of a steel material such as SUJ, SUS, or SUK, and its outer diameter surface is hardened to a surface having a required hardness by heat treatment.

  This surface hardening treatment includes various treatments such as carbonitriding, and these treatments can be appropriately selected.

  On the outer diameter side of the shaft member 1, a first race member 5 serving as a drive side is disposed via a roller bearing (rolling bearing) 3.

The roller bearing 3 includes a plurality of rollers 3a and a cage 3b that holds the rollers 3a. The roller 3b is a needle roller or a cylindrical roller.
The 1st track member 5 consists of steel materials, and is comprised from the shell-shaped outer ring | wheel 5a and the short cylindrical part 5b.

  The shell-shaped outer ring 5 a is an outer ring of the roller bearing 3. The shell outer ring 5a is press-fitted into the inner diameter surface of the short cylindrical portion 5b. The short cylindrical portion 5b is a cylindrical portion that is short in the axial direction, and is disposed on the outer diameter surface on one end side in the axial direction of the shell outer ring 5a.

  A second track member 9 extending in a cylindrical shape in the axial direction through a sprag-type one-way clutch 7 on the outer diameter side of the shell-shaped outer ring 5a of the first track member 5 and facing the first track member 5 in the radial direction. Has been placed.

  The shell-shaped outer ring 5 a is not only the outer ring of the roller bearing 3 but also the inner ring of the one-way clutch 7, and both the outer ring of the roller bearing 3 and the inner ring of the one-way clutch 7 are used. As a result of this, it is possible to reduce component costs, assembling costs, and the like associated with a reduction in the number of components, as compared with the case where the inner ring of the one-way clutch 7 is manufactured separately from the shell-shaped outer ring 5a.

  The one-way clutch 7 includes a plurality of sprags 7a arranged at equal intervals in the circumferential direction between the shell-shaped outer ring 5a and the second track member 9, and an outer holding for holding the sprags 7a on the outer diameter side and the inner diameter side, respectively. And an annular ribbon spring 7d that is disposed between the outer cage 7b and the inner cage 7c and biases the sprag 7a toward the lock side.

  The outer cage 7b, the inner cage 7c, and the ribbon spring 7d have pocket holes 7b1, 7c1, and 7d1, respectively. The outer cage 7b has a radially outward flange portion 7b2, and the inner cage 7c has a radially inward flange portion 7c2.

  Similar to the shaft member 1, the second race member 9 has an inner surface hardened to a surface having a required hardness as a raceway surface by heat treatment.

  On the one end side in the axial direction of the short cylindrical portion 5b of the first raceway member 5, it extends annularly outward in the radial direction and faces the one end side in the axial direction of the second raceway member 9 with a predetermined first gap therebetween. A first flange portion 11 is provided.

  A drive source (not shown) is connected to the outer diameter side of the first flange portion 11, and the first flange portion 11 is rotationally driven by this drive source, whereby the first track member 5 transmits this power transmission. The track member on the drive side in the apparatus can be configured.

On the other end side in the axial direction of the second track member 9, a second flange portion 13 that extends annularly inward in the radial direction and faces the other end side in the axial direction of the first track member 5 with a predetermined second gap. Is provided.
A third flange portion 14 extending annularly from the inner diameter end portion of the second flange portion 13 to one end side in the axial direction is provided. The outer diameter surface of the third flange portion 14 constitutes an inner ring raceway of the roller 3a, and the inner diameter surface thereof is splined with the shaft member 1. And the outer diameter surface of the 3rd flange part 14 is hardened by the surface which has hardness required as a track surface by heat processing. The bolt 17 is fastened to the shaft hole 1 b of the shaft member 1, and an annular spacer 16 is interposed between the inner surface 17 b of the head portion 17 a of the bolt 17 and the outer surface 13 a of the second flange portion 13. Etc., so as to be integrally rotatable.

  From the inner diameter side to the outer diameter side by the annular space between the third flange portion 14 and the first race member 5, the annular space between the race members 5 and 9, and the first and second gaps. Thus, a lubricating oil passage 15 is formed.

  In the power transmission device having the above configuration, when the first flange portion 11 is rotationally driven by the drive source, the shell-shaped outer ring 5a press-fitted and fixed to the short cylindrical portion 5b rotates, thereby the sprag 7a. Is in frictional contact with the shell-shaped outer ring 5a, and is tilted in the direction of standing while being urged by the elasticity of the ribbon spring 7d, and is engaged with the shell-shaped outer ring 5a and the second race member 9 to form the shell-shaped outer ring 5a. The 2nd track member 9 is connected so that integral rotation is possible. By this connection, the rotational power of the drive source is transmitted to the second track member 9 via the one-way clutch 7.

  When the second track member 9 rotates in the other direction, the sprag 7a is tilted in the direction opposite to the biting direction against the elasticity of the ribbon spring 7d, and the biting is released. The two track members 9 can be rotated relative to each other. Thereby, the rotational power of the rotational drive source is not transmitted to the shaft member.

  The power transmission device having the above-described configuration and operating is provided with the one-way clutch 7 and the bearing 3 in the radial direction, so that the axial width of the power transmission device is shortened. In addition, a lubricating oil passage 15 communicating from the inner diameter side to the outer diameter side is formed between the facing members of the one-way clutch 7 and the roller bearing 3, so that the rotation of the one-way clutch 7 and the roller bearing 3 is performed. A rotational centrifugal force acts on the lubricating oil with the operation to lubricate the shaft member 1, the roller bearing 3, the first race member 5, the one-way clutch 7, and the second race member 9. The risk of inadequate lubrication of the components of the roller bearing 3 is reduced.

(Embodiment 2)
A power transmission apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. 3 and 4. In the second embodiment, the first track member 5 is constituted by a cylindrical track portion extending in the axial direction and having a heat-treated surface. The roller bearing 3 is provided with a shell-shaped inner ring 5c instead of the shell-shaped outer ring 5a.

  The first race member 5 serves as both the outer ring of the roller bearing 3 and the inner ring of the one-way clutch 7.

  In the power transmission device according to the second embodiment, in addition to being able to obtain the same operational effects as those of the first embodiment, it is possible to reduce the component cost and the assembling cost due to the combination.

  In the above configuration, even if the outer diameter surface of the shaft member 1 is deformed into a petal shape due to strong tightening of the bolt 17, the roller bearing 3 uses the outer diameter surface of the shell-shaped inner ring 5c as its raceway surface. There is no influence of deformation of the outer diameter surface of the shaft member 1 due to tightening.

  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. Further, although the present invention has been described by taking the sprag type one-way clutch as an example in the embodiment, the present invention is not limited to the sprag type one-way clutch of the embodiment, and includes all kinds of power transmission devices.

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 sectional drawing of the power transmission device which concerns on Embodiment 2 of this invention. It is sectional drawing of the BB line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft member 3 Roller bearing 5 1st track member 5a Shell outer ring 5b Short cylindrical part 7 Sprag type one-way clutch 7a Sprag 7b Outer cage 7c Inner cage 9 Second track member 11 First flange portion 13 Second flange portion 15 Lubricating oil passage

Claims (3)

The first race member is disposed on the outer diameter side of the shaft member via a rolling bearing,
A second track member is disposed on the outer diameter side of the first track member via a one-way clutch;
A first flange portion is provided on one end side in the axial direction of the first track member so as to extend annularly outward in the radial direction and is opposed to the one end side in the axial direction of the second track member with a gap,
A second flange portion is provided on the other end side in the axial direction of the second raceway member so as to extend radially inward and face the other end side in the axial direction of the first raceway member with a gap therebetween,
The second flange portion is connected to the shaft member so as to be integrally rotatable,
A power transmission device characterized in that a lubricating oil passage communicating from an inner diameter side to an outer diameter side is formed. The rolling bearing is a roller bearing,
The power transmission device according to claim 1, wherein the first race member is configured by an outer ring of the roller bearing. The rolling bearing is a roller bearing,
2. The power transmission device according to claim 1, wherein the first race member serves as both an outer ring of the roller bearing and an inner ring in which a sprag of the one-way clutch is engaged.

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