JP2001182805A - Pulley unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure torque. SOLUTION: A pulley unit comprises: a hub 1; a pulley 2 which is disposed concentrically with the hub 1 and of which periphery is provided with a belt catching groove 2b; and a one-way clutch 3 which is disposed in an annular space between the hub and pulley, and shifts a rotating power transmission state between the hub and pulley from/to a rotating power shut-off state between the hub and pulley. In the pulley unit, a torque measuring device B measures power transmission torque and racing torque that pass through the one-way clutch disposed between the hub and pulley. The pulley 2 has a connecting groove 2c for locking a connecting projection 31a of a fixing jig 31 disposed to the torque measuring device B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unidirectional annular space between a hub and a pulley having a wavy groove around which a belt is wound concentrically with the hub. The clutch operates the pulley unit that switches between transmitting and shutting off the rotational power between the hub and the pulley, and further improves the ease of measuring the torque of the one-way clutch by applying forward and reverse rotational power to the pulley. About what you did.

[0002] The pulley unit is used as a crank pulley of an engine of an automobile or the like, or a pulley of an auxiliary device (a compressor for an air conditioner, a water pump, an alternator, a cooling fan, etc.) mounted on the automobile.

[0003]

2. Description of the Related Art Various accessories mounted on an automobile engine are driven by a crankshaft of the engine via a belt.

[0004] The pulley unit is provided with the rotational power of the crankshaft to the automobile engine via a hub fixed to the crankshaft of the automobile engine and a belt wound around a wavy belt winding groove formed on the outer periphery. One-way clutch that is interposed in an annular space between the hub and the pulley, and that switches between a state in which rotational power is transmitted between the hub and the pulley or a state in which the transmission is interrupted. In some cases, the one-way clutch connects or disconnects the hub and the pulley to transmit (lock) or disconnect (free) the rotational power of the crankshaft to the pulley.

In designing such a pulley unit, it is necessary to measure a transmission torque and an idling torque at the time of transmitting or shutting off the rotational power.

The measurement of such a torque will be described with reference to FIGS. 9 to 12. FIG. 9 is a diagram showing a schematic configuration of a conventional pulley unit and a torque measuring device, and FIG.
0 is a longitudinal sectional view of the pulley fixing jig in the torque measuring device of FIG. 8, FIG. 11 is a sectional view taken along line (10)-(10) of the pulley fixing jig shown in FIG. 10, and FIG.
2 is an exploded perspective view of the pulley fixing jig.

In these figures, A is a pulley unit, and B is a torque measuring device.

The pulley unit A includes a hub 1 and a pulley 2
, A one-way clutch 3 between the hub 1 and the pulley 2, and bearings 4 on both sides of the one-way clutch in the axial direction.

The hub 1 is fixed to a crankshaft of an automobile engine.

[0010] The pulley 2 is interposed concentrically with the hub 1,
A belt winding groove 2b is formed on the outer periphery. A belt (not shown) is wound around the belt winding groove 2b.

The one-way clutch 3 is interposed between the hub 1 and the pulley 2, and switches between the locked state and the free state.

The torque measuring device B includes a drive motor 30;
Pulley fixing jig 31, connecting shaft 32, coupling 3
3 and a torque converter 34.

The pulley fixing jig 31 includes a jig main body 31A.
And a fastening ring 31B and a plurality of spacers 31C.

The jig body 31A is a bottomed cylindrical body mounted on the outer peripheral surface of the pulley 1, and a rotary shaft 30a of the drive motor 30 is connected to a screw hole formed in the bottom of the jig body 31A. 31A is rotatable integrally with the rotating shaft 30a.

The jig body 31A is formed at the front end thereof in a structure of a plurality of chuck portions 31A1 which are circumferentially equidistant from each other and can be displaced radially in and out.

The fastening ring 31B is connected to the jig body 30A.
The jig body 30A has a screw groove on the inner periphery that matches the screw groove on the outer periphery, and by moving the jig body 30A back and forth in the axial direction,
The chuck portion 31A1 is displaced radially inward or radially outward.

Each spacer 31C is inserted between the pulley 2 and each chuck portion 31A1 of the jig main body 30A, and a groove corresponding to the belt winding groove 2b of the pulley 2 is formed on the inner peripheral surface.

The torque converter 34 is connected and fixed to the connection shaft 32 via a coupling 33 so that its torque can be detected.

When the torque is measured using such a torque measuring device B, the tightening ring 31B is attached to the jig body 3
By moving the pulley 2 to the front end of 1A, the pulley 2 is chucked by the chucks 31A1 of the jig body 31A via the spacer 31C. Thereby, the pulley 2 is fixed to the pulley fixing jig 31.

In the locked state, when the drive motor 30 is rotated in one direction while the pulley 2 is fixed by the pulley fixing jig 31, the pulley 2 rotates synchronously with the drive motor 30,
The rotational power of the drive motor 30 is transmitted to the hub 1 via the one-way clutch 3. The torque transmitted to the hub 1 at this time is measured by the torque converter 34.

As the rotational power of the drive motor 30 increases, the rotational torque measured by the torque converter 34 also increases. However, when a certain rotational power is reached, the measured value of the rotational torque does not increase any more. At this time, the torque measured by the torque converter 34 becomes the transmittable torque.

When the drive motor 30 is rotated in the reverse direction, the pulley 2 idles with respect to the hub 1, but the pulley 2 and the hub 1 rotate.
, A one-way clutch 3 is interposed therebetween, so that a certain amount of torque is applied to the hub 1 from the pulley 2. This torque is measured by the torque converter 34 as the idling torque.

[0023]

In such a torque measuring apparatus B, for accurate torque measurement, the rotating shaft 30a of the drive motor 30 and the pulley 2 are synchronously rotated to reduce the rotational torque of the drive motor 30 to the pulley. 2 needs to be communicated. However, the chuck portion 31A1 for fixing the pulley 2 to the drive motor 30 of the torque measuring device B is
Since the configuration is such that the pulley 2 is pressed radially against the outer circumferential groove, the pulley 2 and the chuck portion 31A1 are more likely to slide as the transmission torque is increased, and the rotation shaft 30a of the drive motor 30 and the pulley 2 are rotated synchronously. Measurement cannot be performed correctly.

Therefore, an object of the present invention is to make it possible to accurately measure the transmittable torque or the idling torque in the pulley unit.

[0025]

According to the present invention, there is provided a pulley unit comprising: a hub; a pulley interposed concentrically with the hub and having a belt winding groove formed on an outer periphery thereof; A pulley unit including a one-way clutch that is interposed in the annular space and that switches to a state in which rotational power is transmitted or cut off between the hub and the pulley,
A coupling portion for locking a rotary power transmission jig provided in a torque measuring device that measures a power transmission torque or a slipping torque via a one-way clutch between a hub and a pulley is provided on the pulley. .

According to the pulley unit of the present invention, the hub and the pulley can be relatively rotated only by connecting the rotary power transmission jig of the torque measuring device to the connecting portion of the pulley, so that the conventional chuck is used. Force adjustment is not required, and the relative rotational torque between the hub and the pulley can be accurately and easily measured.

In a preferred embodiment of the present invention, the connecting portion is a concave and convex portion formed on the outer end surface of the pulley at several locations in the circumferential direction.

As a preferred embodiment of the present invention, the wavy groove of the pulley is provided in an axially intermediate region of the outer peripheral surface of the pulley, and the coupling portion is formed by removing the wavy groove existing region on the outer peripheral surface of the pulley. The concave and convex portions are formed at several places in the circumferential direction of the region.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.

FIGS. 1 to 4 show a pulley unit according to an embodiment of the present invention. 1 is a longitudinal sectional view of the pulley unit, FIG. 2 is a sectional view taken along line (2)-(2) of FIG. 1, and FIG. 3 is a plan development view showing a part of the one-way clutch. FIG. 4 is a perspective view of a pulley, which is a main part of the embodiment, as viewed from the rear.

In these figures, A indicates the entire pulley unit. The pulley unit A is used as a crank pulley of an automobile engine, and has a hub 1, a pulley 2, a one-way clutch 3, and two slide bearings 4, 4.

Although not shown, the hub 1 is fixed to a crankshaft of an automobile engine. The hub 1 is provided with damper masses 5 and 6 for attenuating torsional and bending vibrations of the crankshaft.

The pulley 2 is provided concentrically with respect to the hub 1 and has a flange 2a extending inward in the radial direction at one end in the axial direction on the inner periphery thereof. Is formed with a belt winding groove 2b around which a belt for transmitting the rotational power of the crankshaft to the auxiliary equipment of the automobile engine is wound.

The one-way clutch 3 is interposed in the center of the hub 1 and the pulley 2 in the axial direction of the opposed annular space, and includes an inner race 10, an annular retainer 11, a plurality of rollers 12, an elliptical coil spring. 13, the pulley 2 is used as an outer ring. The inner ring 10 is fitted over the hub 1 by press-fitting, and a flat key for forming a wedge-shaped space between the inner ring 10 and the inner circumferential surface of the pulley 2 at eight circumferential positions on the outer circumferential surface. A cam surface 10a is provided.

The retainer 11 is positioned in the circumferential direction and the axial direction with respect to the outer periphery of the inner ring 10 by the slit 10b provided on the inner ring 10 and the convex portion 11c provided on the retainer 11. It is exterior. Pockets 11a penetrating inward and outward in the radial direction are provided in several places on the circumference of the retainer 11, that is, in a region corresponding to the cam surface 10a of the inner ring 10. The rollers 12 are stored in the pockets 11a of the retainer 11 one by one with the circumferential rolling range restricted. The coil spring 13 is mounted on a protrusion 11b projecting from the inner wall surface of each pocket 11a of the retainer 11, and presses the roller 12 toward a narrow side (lock side) of the wedge-shaped space.

The two slide bearings 4, 4 are fitted on the outer peripheral surface of the hub 1 one by one on both axial sides of the one-way clutch 3 by press-fitting, and a small clearance is formed between the inner peripheral surface of the pulley 2. Are opposed to each other.

In the pulley 2 described above, the one-way clutch 3 and the slide bearings 4, 4 are screwed to the flange 2 a provided radially inward on the inner peripheral surface of the pulley 2 and to the open end of the pulley 2. The lid 7 is positioned by being sandwiched from the axial direction via a required axial gap.

The outer position of the flange 2a of the pulley 2 and
Seals 8 and 9 are attached to the inner periphery of the lid 7. The seals 8 and 9 generally have a well-known configuration mounted on a rolling bearing. One seal 8 is
An elastic body such as rubber is attached to the annular cored bar, and a lip is provided as a part of the elastic body so as to be in sliding contact with the hub 1. The other seal 9 has a configuration in which a seal body and a slinger are combined.
In this configuration, an elastic body such as rubber is attached to an annular cored bar, and a lip is provided as a part of the elastic body so as to be in sliding contact with a slinger.

Next, the operation of the pulley unit A configured as described above will be described.

The pulley unit A here can absorb rotation fluctuations of a crankshaft connected to the hub 1. Normally, the rotation speed of the crankshaft of the automobile engine fluctuates with the torque fluctuation, and the one-way clutch 3 is switched between the locked state and the free state in accordance with the rotation fluctuation, so that the pulley 2 is synchronized with the hub 1. Rotational fluctuation of the pulley 2 is suppressed by causing rotation or rotation of the pulley 2 by its own inertia.

When the rotation speed of the crankshaft and the hub 1 becomes relatively higher than that of the pulley 2, the rollers 12 of the one-way clutch 3 are rolled to the narrow side of the wedge-shaped space to be in a locked state. And the pulley 2 are integrally rotated. However, the rotation speed of the hub 1 is
Relatively slower than the one-way clutch 3
2 is rolled to the wide side of the wedge-shaped space to be in a free state, so that power transmission from the hub 1 to the pulley 2 is interrupted, and the pulley 2 rotates only by the rotational inertia force. . With such an operation, rotation fluctuation of the pulley 2 can be suppressed.

In the above-described pulley unit A, in the embodiment, a rotational power transmitting jig of a torque measuring device B used for applying a rotational power in the forward and reverse directions to the pulley 2 and measuring the torque of the one-way clutch 3. One or more irregularities such as grooves and protrusions formed at several locations in the circumferential direction on the outer surface of the pulley 2 are provided as coupling portions to which a pulley fixing jig (specifically described later) is connected so as to be synchronously rotatable. It has special features.

As the coupling portion, coupling grooves 2c are formed radially from the center of the pulley 2 radially from the center of the pulley 2 at several locations on the outer end surface of the pulley 2. Since the ridge 2d exists between the coupling grooves 2c adjacent in the circumferential direction,
In the outer end surface of the pulley 2, irregularities in the circumferential direction are formed by the coupling groove 2c and the ridge 2d.

After the pulley unit A is manufactured, it is subjected to a torque measurement inspection. This inspection is performed in the form shown in FIGS.

Here, a torque measuring device for performing the torque measurement will be described with reference to FIGS. FIG.
6 is a schematic configuration diagram of a pulley unit A and a torque measuring device B, and FIG. 6 is a perspective view of each of the pulley 2 and a pulley fixing jig 31.

In FIGS. 5 and 6, A is the pulley unit, and B is a torque measuring device. Since the pulley unit A has been described above, its description is omitted.

The torque measuring device B comprises a drive motor 30
Pulley fixing jig 31, connecting shaft 32, coupling 3
3 and a torque converter 34.

The drive motor 30 has a rotating shaft 30a.

The pulley fixing jig 31 has a bottomed cylindrical shaft structure as a rotary power transmitting jig, and a rotary shaft 30a of the drive motor 30 is connected and fixed to a shaft insertion hole at the bottom thereof.
On the end face of the front end portion, a connecting ridge 31a is formed radially from the center of the cylindrical body along the radial direction. And pulley 2
When the outer end face of the pulley fixing jig 31 is pressed against the outer end face of the pulley in the axial direction, each connecting ridge 31a of the pulley fixing jig 31
Each of the pulleys 2 is fitted into each of the coupling grooves 2 c of the pulley 2, thereby fixing the pulley 2 via a pulley fixing jig 31 so as to be able to rotate synchronously with the drive motor 30.

Here, in the embodiment, since the rotating shaft 30a of the drive motor 30 and the pulley fixing jig 31 are separate bodies, the jig for rotating power transmission in the torque measuring device B is the pulley fixing jig 31. Alternatively, the drive motor 30 and the pulley fixing jig 31 may be regarded as an integral structure, and the entirety including the rotary shaft 30a or the entirety including the drive motor 30 may be regarded as the rotational power transmission jig.

The connecting shaft 32 corresponds to an input shaft of an auxiliary machine (not shown).
Is connected and fixed.

The coupling 33 is for connecting the other end of the connecting shaft 32 to the torque converter 34.

The torque converter 34 measures a torque.

The torque measurement by the torque measuring device B will be described.

The pulley fixing jig 31 is connected to the rotating shaft 30 a of the drive motor 30, and the outer end surface of the pulley fixing jig 31 is pressed against the outer end surface of the pulley of the pulley unit A. The connecting ridge 31a is fitted into the connecting groove 2c of the pulley 2. As a result, the pulley 2 is brought into a state where it is rotated in synchronization with the rotation of the drive motor 30.

When the drive motor 30 is rotated in a direction to lock the pulley unit A, the pulley 2
Rotates synchronously with the drive motor 30 via a pulley fixing jig 31, and this rotation is transmitted through the one-way clutch 3 to the hub 1.
As a result, the hub 1 rotates synchronously with the pulley 2,
The rotational power of the drive motor 30 is transmitted to the hub 1 and
Rotates.

When the hub 1 rotates, the connecting shaft 32 connected thereto also rotates, and the torque converter 34 is twisted via the coupling 33. Will be detected.

When the drive motor 30 is rotated in a direction to make the pulley unit A free, the pulley 2
Rotates synchronously with the drive motor 30 via the pulley fixing jig 31, but this rotation is not transmitted to the hub 1 via the one-way clutch 3, and the pulley 2 idles. This pulley 2
When the hub 1 is idling, the hub 1
Is detected by the torque converter 34 as idling torque.

In such a torque measuring device B,
Since the pulley 2 and the pulley fixing jig 31 are connected by the coupling groove 2c and the coupling ridge 31a, the driving motor 3 can be driven regardless of whether the rotational power of the driving motor 30 is small or large.
The rotation torque of the drive motor 30 can be transmitted to the pulley 2 by synchronizing the rotation of the rotation shaft 30a with the pulley 2 and the torque measurement can be performed easily and precisely. And
Since the pulley 2 does not receive a load that causes deformation even when the rotational power of the drive motor 30 is large, the pulley 2 has excellent structural reliability.

Also, the drive motor 7 is not required to be large and costly to generate a large rotating power, and the measured value of the torque converter 34 becomes the transmittable torque as it is. While the measurement calculation is simple, the measurement accuracy is high.

It should be noted that the present invention is not limited to only the above-described embodiment, and various applications and modifications are conceivable.

(1) In the one-way clutch in the above-described embodiment, the circumferential uneven structure of the outer end surface of the pulley 2 is a structure including the groove 2c and the ridge 2d, but is not limited to this. As shown by 7, the pulley 2 may have an uneven structure including a plurality of holes 2 e in the circumferential direction and an end face 2 f between the holes 2 e. In this case, the pulley fixing jig 3
A plurality of pins 31b in the circumferential direction corresponding to the pins 31 may be formed on the first pin.

(2) The belt winding groove 2b of the pulley 2
Although provided in the axially intermediate region of the outer peripheral surface of the pulley 2, as shown in FIG. 8, the connecting portion is formed at several circumferential positions of the region 2 h excluding the belt winding groove existing region on the outer peripheral surface of the pulley. Irregularities to be formed, for example, grooves 2g may be used. In this case, the pulley fixing jig 31 is
A cylindrical portion 31c that can be fitted on the outer surface of the cylindrical member h may be provided on the inner periphery of the cylindrical portion 31c with a ridge 31d that can be fitted into the groove 2g.

(3) In the pulley unit A described in the above embodiment, if it is necessary to detect the rotation speed of the pulley using a proximity sensor when the pulley unit A is mounted on an actual mounting target, The irregularities formed by the grooves 2c and the ridges 2d can also be used as proximity sensor pulse grooves.

(4) In the above embodiment, a crank pulley is taken as an example of the pulley unit A, but various pulley units incorporating a one-way clutch are applicable to the present invention. As this type of pulley unit, for example, a pulley of an auxiliary device (compressor for an air conditioner, a water pump, an alternator, a cooling fan, etc.) mounted on an automobile is exemplified.

[0066]

According to the present invention, a rotational power transmitting jig of a torque measuring device used for measuring the torque of the one-way clutch by applying rotational power in forward and reverse directions to a pulley is connected to be synchronously rotatable. When the torque measurement inspection is performed, it is possible to attach the manufactured pulley fixing jig in a state where the jig is hooked in the circumferential direction with respect to the outer end surface of the pulley of the pulley unit. Since the pulley fixing jig and the pulley do not slip in the circumferential direction, they always rotate together, and the torque measurement becomes accurate.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pulley unit according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a developed plan view showing a part of the one-way clutch.

FIG. 4 is a perspective view of a pulley which is a main part of the embodiment.

FIG. 5 is a schematic configuration diagram of a pulley unit and a torque measuring device according to the embodiment.

FIG. 6 is a perspective view showing a pulley and a pulley fixing jig of the embodiment.

FIG. 7 is a perspective view showing another modification of the pulley and the pulley fixing jig of the present invention.

FIG. 8 is a perspective view showing another modified example of the pulley and the pulley fixing jig of the present invention.

FIG. 9 is a schematic configuration diagram of a conventional pulley unit and a torque measuring device.

FIG. 10 is a longitudinal sectional view of a conventional torque measuring device.

11 is a sectional view taken along line (10)-(10) of FIG.

FIG. 12 is an exploded perspective view of the torque measuring device of FIG. 10;

[Explanation of symbols]

 Reference Signs List A pulley unit B torque measuring device B 1 hub 2 pulley 2b belt winding groove 2c coupling groove 3 one-way clutch 30 drive motor 30a rotating shaft 31 pulley fixing jig 31a coupling ridge

Claims (3)

[Claims] 1. A hub, a pulley interposed concentrically with the hub and having a belt winding groove formed on the outer periphery, and a hub interposed in an annular space between the hub and the pulley. A pulley unit that has a one-way clutch that switches between a state in which rotational power is transmitted or a state in which the rotational power is interrupted, and measures power transmission torque and idle torque through a one-way clutch between a hub and a pulley. A pulley unit, wherein a coupling portion for locking a rotary power transmission jig provided in the torque measuring device is provided on the pulley. 2. The pulley unit according to claim 1, wherein said connecting portion is formed as a concave and convex portion formed at several positions in a circumferential direction on an outer end surface of said pulley. 3. The pulley unit according to claim 1, wherein the belt winding groove of the pulley is provided in an axially intermediate region of an outer peripheral surface of the pulley, and the connecting portion is a belt winding groove on an outer peripheral surface of the pulley. A pulley unit, characterized in that it is an uneven portion formed at several places in the circumferential direction of an area excluding the hanging groove area.