JPH0564554U - Rotation fluctuation absorbing pulley - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rotation fluctuation absorbing pulley capable of sufficiently absorbing rotation fluctuation of transmission rotation in a belt transmission mechanism and preventing vibration transmission. A pulley outer peripheral member 2 having a V groove around which a V belt is wound, a pulley inner peripheral member 4 integrally coupled to the inner periphery of the pulley outer peripheral member 2 via an elastic rubber member 3, and an inner periphery of the pulley. A pulley hub member 5 into which the member 4 is fitted so as to be relatively rotatable within a predetermined angle range via a stopper mechanism 9, and one end of the pulley hub member 5 is locked to the pulley hub member 5 and the other end thereof presses the pulley inner peripheral member 4. Coil spring 6 and the pulley inner peripheral member 4 by the pressing force of the coil spring 6.
And a friction plate 7 sandwiched between the flange portion formed on the pulley hub member 5 and a rotation fluctuation absorbing pulley.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pulley that constitutes a belt transmission mechanism. For example, when applied to a belt transmission mechanism between a crank shaft of an engine and a rotating shaft of an auxiliary device, it is possible to absorb rotational fluctuation absorption of the engine. Regarding pulleys.

[0002]

[Prior Art]

 As a pulley that constitutes a belt transmission mechanism, a so-called rotation fluctuation absorbing pulley that is configured to absorb the rotation fluctuation of the transmission rotation is conventionally known (see Japanese Utility Model Publication No. 3-9545). This rotation fluctuation absorbing pulley has a basic structure in which an outer hub having a V groove around which a V belt is wound and an inner hub fixed to a rotating shaft are connected to each other via a fluctuation absorbing rubber. The hub and the inner hub can rotate relative to each other within a range in which the fluctuation absorbing rubber is elastically deformed and twisted. In such a rotation fluctuation absorbing pulley, for example, when fluctuations occur in the input rotation transmitted to the outer hub via the V-belt, the outer hub elastically deforms the fluctuation absorbing rubber and rotates relative to the inner hub. By moving, it absorbs the fluctuation of the input rotation.

As a related prior art, there is a clutch damper described in Japanese Utility Model Laid-Open No. 61-139317, in which a rubber-like elastic material is attached to the outer periphery of a hub which is attached to the first plate and is externally attached to the shaft. It is shown that the boss is connected via the first shock absorbing member and the second plate is connected to the outer circumference of the boss via the similar second shock absorbing member. Further, a stopper mechanism is provided between the hub and the boss and between the first plate and the second plate to rotate the hub and the boss relative to each other and to prevent the first plate and the second plate from rotating relative to each other. It is shown that the relative rotation is stopped within a predetermined angle. Furthermore, it is shown that a spacer member is provided in an annular space surrounded by the hub, the boss, and the first buffer member.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The rotation fluctuation absorbing pulley described in Japanese Utility Model Publication No. 3-9545 includes a stopper mechanism for restricting relative rotation of the outer hub and the inner hub within a predetermined angle range. Therefore, in order to stop the relative rotation within a predetermined angle range, the spring constant for the torsion angle of the fluctuation absorbing rubber cannot be lowered so much. Therefore, the spring constant with respect to the torsion angle of the fluctuation absorbing rubber tends to be high, and the natural frequency may be high, so that the rotation fluctuation of the transmission rotation may not be absorbed.

Therefore, an object of the present invention is to provide a rotation fluctuation absorbing pulley capable of sufficiently absorbing the rotation fluctuation of the transmission rotation in the belt transmission mechanism and preventing the vibration transmission.

[0006]

[Means for Solving the Problems]

 For this purpose, the rotation fluctuation absorbing pulley according to the present invention comprises a pulley outer peripheral member having a V groove around which a V belt is wound, and a pulley outer peripheral member integrally connected to the inner periphery of the pulley outer peripheral member via an elastic rubber member. A peripheral member, a pulley hub member into which the inner peripheral member of the pulley is fitted so as to be rotatable relative to a predetermined angle range via a stopper mechanism, and one end of the pulley hub member is locked to the other end of the pulley hub member. By providing a coil spring for pressing the peripheral member and a friction plate sandwiched between the pulley inner peripheral member and the flange portion formed on the pulley hub member by the pressing force of the coil spring, There is.

[0007]

[Action]

 In the rotation fluctuation absorbing pulley that employs such means, when the rotation fluctuation occurs in the transmission rotation, the pulley hub member and the pulley inner peripheral member are opposed to each other against the frictional force of the friction plate according to the pressing force of the coil spring. By rotating, the fluctuation in rotation is absorbed. Also, when the rotation fluctuation is large and the relative rotation between the pulley hub member and the pulley inner peripheral member is restricted within a predetermined angle range by the stopper mechanism, the elastic rubber member is elastically deformed and twisted, and The member and the outer peripheral member of the pulley relatively rotate to absorb a large rotation fluctuation.

As described above, in the rotation fluctuation absorbing pulley according to the present invention, the coil spring and the friction plate that make frictional contact between the pulley hub member and the pulley inner peripheral member constitute a first stage spring system, and the pulley inner peripheral member and the pulley The elastic rubber member that is connected to the outer peripheral member constitutes the second stage vane system, and the spring system as a whole is made non-linear. The spring constant of the first stage can be reduced by adjusting the set load of the coil spring and selecting the friction coefficient of the friction plate. The spring constant can be lowered. Therefore, it is possible to reduce the natural frequency, sufficiently absorb the rotational fluctuation of the transmission rotation in the belt transmission mechanism, and prevent the vibration transmission.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1 showing the overall configuration of a rotation fluctuation absorbing pulley 1 according to an embodiment, reference numeral 2 is a pulley outer peripheral member 2, 3 is an elastic rubber member 3, 4 is a pulley inner peripheral member 4, 5 is a pulley hub member 5, 6. Coil springs 6 and 7 indicate friction plates 7, respectively.

The pulley outer peripheral member 2 has a V groove 2a around which a V belt (not shown) is wound, and a ring-shaped elastic rubber member 3 is integrally connected to the inner periphery by vulcanization adhesion. There is. The inner periphery of the elastic rubber member 3 is integrally joined to the outer periphery of the pulley inner peripheral member 4 pressed into a dish shape by vulcanization adhesion, and thus the pulley outer peripheral member 2 and the pulley inner peripheral member 4 are joined together. Is capable of relatively rotating due to the torsional elasticity of the elastic rubber member 3.

The pulley hub member 5 has a fitting hole 5a for spline fitting with a crankshaft of an engine (not shown) or a rotating shaft of an auxiliary device, and a flange portion 5b is formed in a central portion of an outer periphery thereof. ing. On one side of the flange portion 5b, the ring-shaped friction plate 7 and the pulley inner peripheral member 4 are fitted to the pulley hub member 5, and the coil spring 6 is further wound.

One end of the coil spring 6 is supported by the pulley hub member 5 via a spring receiver 8, and the other end of the coil spring 6 abuts against the inner peripheral member 4 of the pulley to press it. The friction plate 7 is sandwiched between the peripheral member 4 and the flange portion 5b.

Here, as also shown in FIG. 2, the flange portion 5b of the pulley hub member 5 is provided with engaging holes 5c, which are arcuate elongated holes, which are arranged at equal intervals, for example, 4 in the circumferential direction. Each stopper piece 4a fitted into the engaging hole 5c is cut and raised on the side surface of the pulley inner peripheral member 4 to form a stopper mechanism 9. Then, the pulley inner peripheral member 4 and the pulley hub member 5 can be relatively rotated by a predetermined angle within a range in which the stopper piece 4a of the stopper mechanism 9 engages with the engagement hole 5c.

Next, the operation of the rotation fluctuation absorbing pulley 1 according to the embodiment configured as described above will be described. The rotation fluctuation absorbing pulley 1 is applied to, for example, a belt transmission mechanism (not shown) that transmits power between a crankshaft of an engine and a rotating shaft of auxiliary devices. It is transmitted to the V-belt through the path of the pulley hub member 5, the friction plate 7, the pulley inner peripheral member 4, the elastic rubber member 3, and the pulley outer peripheral member 2.

Here, when the engine rotational speed fluctuates greatly and the rotational speed of the transmission rotation fluctuates during idling of the engine, the frictional force of the friction plate 7 corresponding to the pressing force of the coil spring 6 is resisted. As a result, the pulley hub member 5 and the pulley inner peripheral member 4 relatively rotate, and Coulomb damping at this time absorbs the rotational fluctuation.

Further, when the rotational fluctuation of the transmission rotation is large, the relative rotation between the pulley hub member 5 and the pulley inner peripheral member 4 is restricted within a predetermined angle range by the stopper mechanism 9. In this case, When the elastic rubber member 3 is elastically deformed and twisted, the pulley inner peripheral member 4 and the pulley outer peripheral member 2 relatively rotate to absorb a large rotation fluctuation.

As described above, in the rotation fluctuation absorbing pulley 1 according to the embodiment, the coil spring 6 and the friction plate 7 that bring the pulley hub member 5 and the pulley inner peripheral member 4 into frictional contact constitute a first stage spring system, The elastic rubber member 3 connecting the pulley inner peripheral member 4 and the pulley outer peripheral member 2 constitutes a second-stage spring system, and the spring system as a whole is made non-linear.

Here, in the first stage spring system, the spring constant can be made small by adjusting the set load of the coil spring 6 and selecting the friction coefficient of the friction plate 7. Therefore, the first stage and the second stage The spring constant of the spring system as a whole can be lowered as shown in FIG. Therefore, the natural frequency of the rotation fluctuation absorbing pulley 1 can be reduced, the rotation fluctuation of the transmission rotation in the belt transmission mechanism can be sufficiently absorbed, and the vibration transmission due to the engine rotation fluctuation can be prevented. ..

As described above, the rotation fluctuation absorbing pulley 1 according to the embodiment can prevent the transmission of vibrations from the engine to the auxiliary devices, so that the abnormal sounds of the auxiliary devices are prevented and the durability of the auxiliary devices is improved. The property is also improved.

In the first-stage spring system including the coil spring 6 and the friction plate 7, the relative rotation direction between the pre-hub member 5 and the pulley inner peripheral member 4 is opposite to the winding direction of the coil spring 6. When it is oriented, the load of the coil spring 6 tends to increase when the torsion angle is large (see FIG. 4). Therefore, from this point as well, a nonlinear spring system is constructed.

[0021]

[Effect of the device]

 As described above, according to the present invention, when the transmission rotation changes, the pulley hub member and the pulley inner peripheral member rotate relative to each other against the frictional force of the friction plate according to the pressing force of the coil spring. By doing so, the rotation fluctuation is absorbed. Also, when the rotation fluctuation is large and the relative rotation between the pulley hub member and the pulley inner peripheral member is restricted within a certain angle range by the stopper mechanism, the elastic rubber member is elastically deformed and twisted, The peripheral member and the pulley outer peripheral member rotate relatively to absorb a large rotational fluctuation.

As described above, in the rotation fluctuation absorbing pulley according to the present invention, the coil spring and the friction plate that make frictional contact between the pulley hub member and the pulley inner peripheral member constitute a first-stage spring system, and the pulley inner peripheral member and the pulley inner peripheral member. The elastic rubber member that is connected to the outer peripheral member constitutes the second stage vane system, and the spring system as a whole is made non-linear. The spring constant of the first stage can be reduced by adjusting the set load of the coil spring and selecting the friction coefficient of the friction plate. The spring constant can be lowered. Therefore, it is possible to reduce the natural frequency, sufficiently absorb the rotational fluctuation of the transmission rotation in the belt transmission mechanism, and prevent the vibration transmission.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of an embodiment of a rotation fluctuation absorbing pulley according to the present invention.

FIG. 2 is a partial right side view of FIG.

FIG. 3 is a characteristic diagram of an entire spring system according to an embodiment.

FIG. 4 is a characteristic diagram of a first stage spring system according to an embodiment.

[Explanation of symbols]

 1 ... Rotation fluctuation absorbing pulley 2 ... Pulley outer peripheral member 2a ... V groove 3 ... Elastic rubber member 4 ... Pulley inner peripheral member 4a ... Stopper piece 5 ... Pulley hub member 5a ... Fitting hole 5b. Flange 5c ...... Engagement hole 6 ...... Coil spring 7 ...... Friction plate 8 ...... Spring receiver 9 ...... Stopper mechanism

Claims (1)

[Scope of utility model registration request] 1. A pulley outer peripheral member (2) having a V groove around which a V belt is wound, and a pulley inner peripheral member integrally connected to an inner peripheral member of the pulley outer peripheral member (2) through an elastic rubber member (3). A member (4), a pulley hub member (5) into which the pulley inner peripheral member (4) is fitted so as to be relatively rotatable within a predetermined angle range via a stopper mechanism (9), and one end of the pulley hub member (5) A coil spring (6) whose part is locked and the other end presses the pulley inner peripheral member (4), and the pulley inner peripheral member (4) and the pulley hub member due to the pressing force of the coil spring (6). A rotation fluctuation absorbing pulley, comprising: a friction plate (7) sandwiched between the flange portion (5b) formed in (5) and the friction plate (7).