JP2003156075A - Pulley unit with one-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulley unit with a one-way clutch, requiring a less number of parts, securing its size enough for the one-way clutch and having improved durability. SOLUTION: The one-way clutch 5 is provided between a shaft 3 and a pulley 4 concentrically arranged therearound. The one-way clutch 5 has a biting member 13 and an energizing member 14 to be rotated integrally with the outer ring of the one-way clutch 5, the biting member 13 being moved in the direction of cancelling biting with the centrifugal force of the outer ring at a predetermined rotating speed or higher and the energizing member 14 having energizing force big enough to allow the movement thereof. The pulley 4 is integrated with the outer ring of the one-way clutch 5. A grease containing an ether base oil and a urea thickener is filled between the outer ring and the inner ring of the one-way clutch 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt transmission system for transmitting a rotational force by a belt when starting an internal combustion engine and driving an auxiliary machine by the internal combustion engine, for example.
The present invention relates to a pulley unit with a one-way clutch used for a belt drive starter.

[0002]

2. Description of the Related Art Conventionally, as a pulley unit with a one-way clutch, as shown in FIG.
A frame (51) forming the front end of the shaft part (52a),
It consists of a disk part (52b) and an outer cylinder part (52c), and the frame (5
A clutch output shaft rotatably supported by the frame (51) via a bearing (53) arranged between the front part of (1) and the shaft part (52a).
(52), a clutch input shaft (54) rotatably supported by a rearward protruding portion of the shaft portion (52a) of the clutch output shaft (52) via a bearing (55), and a clutch output shaft (52). It is arranged between the outer cylindrical part (52c) and the clutch input shaft (54), and the input shaft (54) and the output shaft (5
2) and relative rotation in one direction (locking direction) cause it to be caught between both shafts (52) and (54), and the other direction (free direction)
Sprags that release bite when rotated relative to each other
(56) and a nut (58) at the tip of the clutch output shaft (52) shaft.
The one provided with a pulley (57) fixed by
No. 01-99197.

According to the pulley unit with a one-way clutch, when the DC motor (59) of the engine starter (50) rotates at high speed, this rotation is decelerated by the planetary gear speed reducer (60) to the clutch input shaft (54). This is transmitted, and the rotational movement of the clutch input shaft (54) is transmitted to the clutch output shaft (52) via the sprag (56). The rotary motion transmitted to the clutch output shaft (52) is transmitted to the pulley (57), and the pulley (57)
The engine is driven by rotating the engine via the belt. When the engine starts and the rotation speed of the clutch output shaft (52) exceeds the rotation speed of the clutch input shaft (54), the sprag (56) separates from the clutch input shaft (54), which causes the clutch output shaft (54) to move. (52) and pulley (5
After that, 7) can rotate without receiving resistance from the clutch input shaft (54).

[0004]

The pulley unit with a one-way clutch according to the present invention is used for a starter in a belt transmission system for an internal combustion engine that transmits a starting torque to a crankshaft via a belt. Has an aim.

In the conventional pulley unit with a one-way clutch, the clutch output shaft (52) is rotated while the pulley (57) is rotating.
Will rotate together with the pulley (57), but since the clutch output shaft (52) is a part that does not contribute to the drive of the engine, not only the shaft part (52a) but also the disc part (52b) ) And rotation of the outer cylindrical portion (52c) were also major factors of energy loss.

Therefore, a one-way clutch having an inner ring, an outer ring, and an actuating member (for example, a sprag, a spring, etc.) arranged between the shaft and a pulley arranged concentrically around the shaft is provided. It is conceivable to reduce the portion that rotates with the pulley.

However, when the pulley and the outer ring of the one-way clutch are separate bodies and the shaft and the inner ring of the one-way clutch are separate bodies, the number of parts increases and the one-way clutch is arranged between the shaft and the pulley. There is a problem in that the dimensions for doing so cannot be secured.

In addition, when the pulley rotates and the shaft does not rotate, there is a problem that the outer peripheral surface of the inner ring wears due to the contact between the biting member and the inner ring, and the durability decreases. However, if it is carried out for an extremely long time, there is a problem in that the grease deteriorates due to heat and the durability also deteriorates.

An object of the present invention is to provide a pulley unit with a one-way clutch, which has improved durability and can be suitably used as a belt drive starter for an automobile engine.

Another object of the present invention is to reduce the number of parts in the above-mentioned pulley unit and to secure a size for a one-way clutch.

[0011]

A pulley unit with a one-way clutch according to the present invention is provided 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, which is provided with a one-way clutch provided with a biting member and a biasing member that biases the biting member in a biting direction, the one-way clutch includes a biting member and a biasing member. The biasing member rotates integrally with the outer ring, and the biting member moves in the biting-release direction due to the centrifugal force at a predetermined rotation speed or more of the outer ring, and the biasing force of the biasing member has a magnitude that allows this movement. The base oil is characterized in that ether-based grease is enclosed between the outer ring and the inner ring.

The one-way clutch may be of a sprag type having a sprag as a biting member and a spring for urging the sprag as an actuating member, and a roller as the biting member and the sprag type It may be a roller type in which a biasing spring is provided as an actuating member.

The one-way clutch is preferably arranged in a wedge-shaped space formed by the cam surface provided on the inner peripheral surface of the pulley serving as the outer ring and the outer peripheral surface of the shaft serving as the inner ring. And the pulley rotate relative to each other in one direction to engage between the shaft and the pulley, and when the relative rotation in the other direction releases the engagement, the rollers function as multiple engaging members, and the rollers engage. A coil spring serving as a biasing member that biases in the direction (narrow side of the wedge-shaped space) is provided (outer ring cam type).

Examples of the ether base oil include alkyl diphenyl ether. An antioxidant, a rust preventive additive, an extreme pressure additive, a solid lubricant and the like are appropriately added to the grease. The pressure viscosity coefficient of grease is 10
G / Pa or more.

According to the pulley unit with a one-way clutch of the present invention, the ether base oil has good thermal stability,
When used as a belt drive starter of an automobile engine in which the idling state is performed for an extremely long time, excellent durability can be exhibited.

The grease thickener is preferably a urea-based thickener. The ether-based base oil that composes the grease has good thermal stability, and when it is combined with a urea-based thickener, the grease has excellent wear resistance, so the idle state is extremely long. When used as a belt drive starter for an automobile engine to be carried out, it is possible to exhibit more excellent durability.

It is preferable that the pulley and the outer ring of the one-way clutch are integrated. With this configuration, the P.D. of the engaging member (sprag, roller) of the one-way clutch can be suppressed while suppressing the outer diameter of the pulley. C. D can be increased, and as a result, the centrifugal force that acts on the biting member is increased, and the non-contact state between the biting member and the shaft when idling can be secured.

The one-way clutch is provided between the shaft and the intermediate portion of the pulley in the axial direction, and the roller bearing and the ball bearing are provided between the shaft and the pulley with the one-way clutch interposed therebetween. Is preferred. By doing so, the pulley can rotate at high speed, and this unit can be suitably used as a belt drive starter for an automobile engine.

Furthermore, it is preferable that the pulley, the outer ring of the one-way clutch, and the outer ring of the bearing are integrated, and the shaft, the inner ring of the one-way clutch, and the inner ring of the bearing are integrated. This reduces the number of parts and
The outer diameter of the pulley can be easily suppressed, and the outer diameter of the inner ring of the one-way clutch can be suppressed.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a pulley unit with a one-way clutch according to the present invention. The pulley unit with a one-way clutch (1) is arranged in a portion that connects the drive unit of the engine and the rotation shaft of the starter motor,
A one-way clutch (5) is provided between the hollow shaft (3) fitted to the rotary shaft (2) of the starter motor and the pulley (4) arranged concentrically with the hollow shaft (3). On the outer periphery of the pulley (4), a belt spanning portion (4a) around which the V-ribbed belt (B) is spanned is provided.

The one-way clutch (5) consists of a hollow shaft (3) and a pulley.
The hollow shaft (3) is provided between the axial middle part of (4).
Between the roller bearing and each end of the pulley (4).
And a ball bearing (7) is provided with the one-way clutch (5) interposed therebetween. Sealing members (8) and (9) are arranged further axially outside the roller bearing (6) and the ball bearing (7), respectively.
Further, a seal member (10) is arranged on the free end side (left end side in the figure) of the pulley unit to prevent muddy water and the like from entering the inside of the pulley unit.

As shown in FIG. 2, the one-way clutch (5) includes a cam surface (11) provided on the inner peripheral surface of the pulley (4), an outer peripheral surface of the cam surface (11) and the hollow shaft (3). The hollow shaft (3) and the pulley (4) are arranged in a wedge-shaped space (12) formed by the surface and the relative rotation in one direction (locking direction).
The roller (13) and the roller (13) that are engaged between the (3) and the pulley (4) and that release the engagement when they rotate relative to each other in the other direction (free direction), and the roller (13). A coil spring (14) as an urging member that urges in the biting direction (narrow side of the wedge-shaped space (12)) and a cage (15) that positions the rollers (13) in the wedge-shaped space (12). I have it.

The cam surface (11) is provided with a plurality of sets (four sets in this embodiment) of two parallel surfaces (11a) (11b) (11c) (11d) which are opposed to each other with the shaft center interposed therebetween in the circumferential direction. It is configured. The two parallel surfaces (11a) (11b) (11c) (11d) are rollers (13)
The angle indicated by θ in FIG. 3, which is an enlarged view of a part of FIG. 2, is not an angle at right angles to the normal line (19) passing through the center and the center of the axis, but is an acute angle slightly smaller than the angle at right angles. Thus the pulley
By providing the cam surface (11) on (4), the pulley (4) is given the function of the outer ring of the one-way clutch (5), and the outer ring of the pulley (4) and the one-way clutch (5) is added. Has been integrated with. As a result, the P.D. of the roller (13) is reduced while suppressing the outer diameter of the pulley (4). C. D can be increased, and the centrifugal force acting on the roller (13) is large.

Wedge-shaped space of two parallel surfaces (11a) (11b) (11c) (11d)
A roller holding concave surface portion (16) for stopping the roller (13) having a circular cross section and having a centrifugal force is provided at an end portion of the wide side of the (12). The concave portion (16) has an arc shape with a radius substantially the same as the radius of the outer peripheral surface of the roller (13).

As shown in FIG. 1, the inner diameter of the pulley (4) is stepped, and the outer ring of the roller bearing, the outer ring of the one-way clutch and the outer ring of the ball bearing of the pulley (4) are Regarding the dimensions corresponding to the respective functions, the inner diameter of the outer ring raceway portion of the roller bearing is D1, the minimum inner diameter of the outer ring of the one-way clutch (in this embodiment, the distance between the two parallel surfaces of the outer ring cam surface (11)) is D2, and the ball bearing. Let D3 be the shoulder inner diameter of the outer ring raceway of D1> D2 ≧ D
It is said to be 3.

The outer diameter of the hollow shaft (3) is constant except for the groove, and the outer diameter of the inner ring raceway portion of the roller bearing (6) = the outer diameter of the inner ring of the one-way clutch (5) = the ball bearing ( It is the outer diameter of the outer ring raceway shoulder of 7).

Further, the roller (13) at the engagement start position with the innermost diameter portion of the outer circumference of the pulley in the belt spanning portion (4a)
The radial distance T1 from the center of the roller is smaller than the radial distance T2 between the center of the roller (13) at the biting start position and the minimum inner diameter of the inner circumference of the hollow shaft (3). That is,
Comparing the substantial thicknesses of the pulley (4) and the hollow shaft (3), the thickness of the pulley (4) is thin. As a result, the P.D. of the roller (13) is reduced while suppressing the outer diameter of the pulley (4).
C. D can be increased and the centrifugal force acting on the roller (13) is increased.

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

The cage (15) is made of synthetic resin and has a cam surface (11).
It has an outer peripheral shape substantially along the outer peripheral surface and an inner peripheral shape along the outer peripheral surface of the hollow shaft (3), and is press-fitted into the cam surface (11). A slight gap is provided between the cage (15) and the outer circumference of the hollow shaft (3). 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 retaining recess (16) of the cam surface (11) and the spring positioning surface (18) provided on the inner circumference of the pulley (4) to form a coil spring ( The center axis direction of 14) is kept constant. The central axis of the coil spring (14) is deformed in a direction that reduces the biasing force against the rollers (13) when a centrifugal force acts on the coil spring (14), so that the outer peripheral surface of the hollow shaft (3) can be deformed. It is inclined with respect to the tangential direction. The spring positioning surface (18) of the pulley (4) is the cam surface.
Similar to (11), it is configured by four sets of two surfaces, which are formed in parallel and are opposed to each other with the axis of the one-way clutch (5) interposed therebetween, in the circumferential direction.

The spring receiving recess (17) is a spring end positioning for preventing the coil spring (14) from moving in the axial direction of the spring, as shown by reference numerals (17a) and (17b) in FIGS. 3 and 4. Face (17a)
And a spring inner positioning surface (17b) that prevents the coil spring (14) from moving inward perpendicular to the spring axis, and the spring positioning surface (18) of the pulley (4) is Spring
It is a spring outer positioning surface that prevents (14) from moving outward perpendicular to the spring axis. With these spring positioning surfaces (17a) (17b) (18), the central axis of the coil spring (14) is orthogonal to the central axis of the roller (13) as shown in FIG.
It is kept parallel to the two parallel surfaces (11a) (11b) (11c) (11d) of the cam surface (11).

FIG. 5 is a view of a part of the retainer (15) as seen from the outside in the radial direction, and as indicated by reference numerals (17d) and (17e) in the figure,
In the spring receiving recess (17), the coil spring (14) is a one-way clutch.
It has the axial-direction positioning surfaces (17d) and (17e) that prevent the axial movement of (5).

Positioning surface (1) inside the spring of the spring receiving recess (17)
A roller holding inclined surface (17c) is provided so as to be continuous with 7b). The other end of the inclined surface (17c) has a slight gap with respect to the outer peripheral surface of the hollow shaft (3). Pulley
Roller holding concave part (16) which is the roller holding surface of (4) and cage
The roller holding surface (15c), which is the roller holding inclined surface (17c), forms a roller holding portion having a substantially C-shaped cross section for receiving and holding the roller (13) that has moved in the bite release direction. ing.

2 and 3 show a state in which the centrifugal force does not act on the roller (13) and the coil spring (14), and when the hollow shaft (3) is rotated counterclockwise in this state. ,
The roller (13) engages between the hollow shaft (3) and the pulley (4), and the hollow shaft (3) and the pulley (4) rotate integrally. Then, when the pulley (4) rotates at high speed and the rotation of the hollow shaft (3) is stopped, the direction of centrifugal force acting on the rollers (13) (reference numeral (1
(Outward direction of the line indicated by 9)) Where (13) is parallel 2 planes (11
a) (11b) (11c) (11d) is out of alignment with the normal direction at the point where it is parallel to the roller (13).
a) (11b) (11c) (11d) is applied, which causes the roller (13) to move in the wedge-shaped space as shown by the arrow in FIG.
Move to the wider side of (12).

In this state, the concave surface portion (16), which is the roller holding surface of the pulley (3), is a concave surface having an arc-shaped cross section with a radius substantially the same as the radius of the outer peripheral surface of the roller (13). The outer peripheral portion of the roller (13) having a surface fits exactly in this concave surface portion (16), and the inclined surface (17c) which is the roller holding surface of the cage (15) is applied from the radially inner side. The rollers (13) are not tilted, a gap is secured between the outer circumference of the hollow shaft (3) and the hollow shaft (3), and a non-contact state with the hollow shaft (3) and the hollow region (13) is achieved.

When the pulley unit with a one-way clutch is used in a belt drive starter, the grease is required to have excellent meshability, wear resistance and thermal stability. The meshing property and the wear resistance to the meshing are properties required for the general one-way clutch,
Thermal stability and wear resistance against slipping are characteristics that are required when idle running is frequently used, and by ensuring both wear resistance and thermal stability, the durability of the pulley unit with a one-way clutch is secured. To be done. Also, under the usage conditions of the belt drive starter, the angular acceleration is 300 to 4
00 rad / sec ² and the temperature is 10 to 20.
It is about 0 ° C.

Next, the structure of the grease used in the pulley unit with the one-way clutch will be described.

Table 1 shows the relationship between the type of grease base oil and its characteristics. From this table, regarding heat stability, ether-type polyphenyl ether is the most excellent, but polyphenyl ether has poor wear resistance, and in order to improve durability, it is necessary to improve wear resistance. Will be needed.

[0040]

[Table 1]

In a one-way clutch in which idling is performed for a long time, it is particularly important to reduce wear during idling. Therefore, it is necessary to select grease having a large oil film thickness and good meshability. The oil film thickness is
It can be used as an index of wear resistance, and if it is large, wear is reduced. Table 2 shows a comparison between the grease having each base oil and the oil film thickness at a wedge angle of 9 °, a spring load of 1 N, a temperature of 100 ° C, and an engine rotation of 500 rpm.

[0042]

[Table 2]

It can be seen from Table 2 that grease containing alkyldiphenyl ether as a base oil has a large oil film thickness and is highly effective in reducing wear on the cam surfaces (11) and (13) in the one-way clutch during idling.

Table 3 shows the characteristics of 5 kinds of greases and the results of wear evaluation, and FIG. 6 shows the relationship between the pressure viscosity coefficient of grease and the wear depth of 2 kinds of greases (the base oil is an ether type and the thickener is The results of measurements for urea and Li soap) are shown below.

[0045]

[Table 3]

In the results of FIG. 6, the solid line is the regression curve of the urea thickener used. From the results of Table 3 and FIG. 6, the urea thickener is used and the pressure-viscosity coefficient is 10 G. / Pa or more, even if an ether base oil (in this example, an alkyl diphenyl ether) that is inferior to the polyol ester in abrasion resistance of the base oil alone is used, the polyol ester is used as the base oil. It can be seen that the wear depth of the one-way clutch at the time of biting is comparable to that of the used one due to the biting of the roller (13) on the cam surface (11). As described above, the polyphenyl ether is superior in heat stability to the polyol ester, and the grease using the alkyldiphenyl ether as a base oil and the urea compound as a thickener has abrasion resistance and heat stability. It can be seen that the combination of these results in extremely excellent durability.

In FIG. 7, a base oil, which is an example of an ether type base oil used in the present invention, is an alkyl diphenyl ether, and a thickener is a urea type compound (shown by a broken line) and a base oil. The relationship between the temperature and the acceleration at which meshing slippage occurs with grease (shown by a solid line) in which a polyol ester is used and a thickener is a urea compound is shown.

It can be seen from FIG. 7 that (polyol ester + urea) has a better meshing property than (alkyl diphenyl ether + urea) in the entire temperature range. However, the usage condition 1 for the belt drive starter
At temperatures above 00 ° C, is 300-400 rad /
It can be seen that sec ² is satisfied. Therefore, the grease with the ether oil as the base oil is excellent in thermal stability, wear resistance against meshing, and wear resistance during idling, and has good meshability under, for example, the usage conditions of the belt drive starter, It is suitable for one-way clutch grease that runs idle for a long time.

The pulley unit with the one-way clutch operates as follows.

First, at the time of starting, the hollow shaft (3) integral with the rotary shaft (2) of the starter motor is rotated counterclockwise. This allows the wedge-shaped space (1
The roller (13) is bitten into the narrow side of (2), the driving force is transmitted, and the hollow shaft (3) and the pulley (4) rotate integrally.
The pulley (4) is connected to the crankshaft via a belt, and the rotation of the pulley (4) starts the engine. When the engine starts, the starter stops and the pulley
(4) continues to rotate counterclockwise. This allows the roller (1
The bite of 3) is released, and the state in which only the pulley (4) rotates continues. Especially when the engine rotates at high speed, rollers (13)
Is positioned by the concave surface portion (16) having substantially the same curvature as the roller (13), and is in non-contact with the hollow shaft (3). Further, the coil spring (14) receives a force in the direction of contraction due to the centrifugal force due to the rotation speed of the pulley (4) or higher, and the elastic force for urging the roller (13) in the biting direction is reduced, The non-contact state between 13) and the hollow shaft (3) is secured. Since the moving direction of the roller (13) when the centrifugal force acts and the central axis direction of the coil spring (14) match, the coil spring (14) shifts when the roller (13) moves. , The urging force direction of the coil spring (14) does not change when the pulley (4) stops,
The problem that the roller (13) cannot be moved to the bite side properly does not occur.

When assembling this pulley unit (1), the balls and cage of the ball bearing (7), the coil spring (14) and rollers (13) of the one-way clutch (5), and the roller bearing (6) The rollers and the cage may be inserted in this order between the pulley (4) and the hollow shaft (3). As described above, the outer ring raceway inner diameter (D1) of the roller bearing (6)> the parallel two-face distance between the outer ring cam surfaces (11) of the one-way clutch (5) (the minimum inner ring outer diameter of the one-way clutch) (D2 )
≧ The inner diameter (D3) of the shoulder portion of the outer ring raceway of the ball bearing (7). Therefore, a space for work is secured radially outside during each insertion work, and the assembly work can be easily performed.

Since the outer diameter of the hollow shaft (3) is constant except for the groove, it can be processed by cold forging instead of shaving, whereby a pulley with a one-way clutch can be manufactured. The processing cost of the unit can be reduced.

In the above description, the coil spring is shown as a means for urging the roller (13), but a leaf spring or the like can be used instead of the coil spring. Also, as the one-way clutch, the case where the bite member is the roller (13) is shown, but the bite member and the biasing member rotate integrally with the outer ring, and the centrifugal force at a predetermined rotation speed of the outer ring or more In the case of a one-way clutch in which the bite member moves in the bite release direction and the urging force of the urging member has a magnitude that allows this movement, the bite member is a sprag. You can also

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a pulley unit with a one-way clutch according to the present invention.

FIG. 2 is a cross-sectional view of the same.

3 is an enlarged view of a part of FIG. 2, showing a meshing state of a one-way clutch.

FIG. 4 is an enlarged view of a part of FIG. 2, showing a disengaged state of the one-way clutch.

FIG. 5 is a view of the cage as viewed from the outside in the radial direction, and the vertical direction of the figure corresponds to the axial direction of the one-way clutch.

FIG. 6 is a graph showing the results of measuring the relationship between grease temperature and meshing acceleration for two types of grease.

FIG. 7 is a graph showing the relationship between the viscosity of grease and the wear depth.
It is a graph which shows the result measured about the grease of a seed.

FIG. 8 is a cross-sectional view showing a conventional pulley unit with a one-way clutch.

[Explanation of symbols]

(3) Hollow shaft (4) Pulley (5) One-way clutch (6) Roller bearing (7) Ball bearing (12) Cam surface (13) Roller (operating member) (14) Coil spring (operating member)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16H 55/36 F16H 55/36 E // C10N 40:02 C10N 40:02 F term (reference) 3J031 AC01 AC10 BA03 BA08 BA19 CA03 4H104 BB08A BE13B PA01

Claims (5)

[Claims] Claim: What is claimed is: 1. An inner ring, an outer ring, a catching member arranged between the two rings, and a biasing member for biasing the catching member in the catching direction between the shaft and a pulley arranged concentrically around the shaft. In a pulley unit with a one-way clutch provided with a one-way clutch including a biasing member, the one-way clutch has a biting member and a biasing member that rotate integrally with an outer ring, and is operated at a predetermined rotation speed of the outer ring or higher. The biting member moves in the biting release direction by the centrifugal force, and the urging force of the urging member is large enough to allow this movement. A pulley unit with a one-way clutch that is filled with system grease. 2. The pulley unit with a one-way clutch according to claim 1, wherein the grease thickener is a urea thickener. 3. A pulley unit with a one-way clutch according to claim 1, wherein the pulley and the outer ring of the one-way clutch are integrated. 4. The one-way clutch is provided between the shaft and an axially intermediate portion of the pulley, and between the shaft and the pulley,
The pulley unit with a one-way clutch according to claim 1, 2 or 3, wherein the roller bearing and the ball bearing are provided so as to sandwich the one-way clutch. 5. The pulley unit with one-way clutch according to claim 4, wherein the pulley, the outer ring of the one-way clutch, and the outer ring of the bearing are integrated, and the shaft, the inner ring of the one-way clutch, and the inner ring of the bearing are integrated. .