KR101724880B1

KR101724880B1 - Torque transferring apparatus

Info

Publication number: KR101724880B1
Application number: KR1020150105215A
Authority: KR
Inventors: 윤제용
Original assignee: 현대자동차주식회사
Priority date: 2015-07-24
Filing date: 2015-07-24
Publication date: 2017-04-10
Also published as: KR20170012826A

Abstract

A pulley unit positioned at the outermost side of the hub and the hub coupled to the crankshaft by the hollow and formed with a pulley groove at one side; An elastic part provided between the hollow of the hub and the pulley unit; And a friction member coupled to an outer side of the elastic portion and maintained in a state of being radially outwardly pressed by the elastic portion, wherein the friction member slips when a predetermined force or more is applied to the elastic portion.

Description

[0001] TORQUE TRANSFERRING APPARATUS [0002]

The present invention relates to an isolation damper pulley, and more particularly, to a rotation transmission device mounted on a crankshaft of an engine for transmitting rotational force generated from a crankshaft of an engine to various auxiliary machines through a belt.

The engine is provided with a pulley which is coupled to the crankshaft and is adapted to drive an auxiliary machine such as a water pump pulley, an alternator pulley, etc. connected by a belt while rotating. Particularly, in order to solve vibration and noise problems caused by belt durability and belt speed fluctuation caused by excessive torsional vibration caused by torque fluctuation of the crankshaft of an engine, some engines have an isolation function Apply an isolation damper pulley.

FIG. 1 is a side cross-sectional view of a conventional rotation transmitting device (isolation damper pulley), and FIG. 2 is a view showing the operating state of FIG. 1, in which the isolation damper pulley is provided with an elastic portion 50, And serves to reduce the torsional vibration torque by the rubber (51).

That is, the rotation transmitting device is connected to the crankshaft (not shown) by the hollow 11 of the hub 10 so that the torsional vibration torque of the engine (not shown) is directly transmitted in the A direction. The torsional transmission torque transmitted to the hub 10 is attenuated in the rubber 51 and passes through a path to be transmitted to the pulley unit 30. The degree of twist of the rubber 51 is determined according to the torsional vibration torque. However, when an unexpected excessive torsional vibration torque is generated under the operating condition, the rubber 51 is torn and damaged. Therefore, a stopper (not shown) or the like is applied in order to cope with the above-mentioned problem of the breakage of the rubber 51, and this is a reality that the stopper generates noise due to the stopper.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-2006-0039435 A

It is an object of the present invention to provide a rotation transmitting device to which a rubber protecting technique is applied to prevent the rubber portion of the elastic portion from being broken even when an excessive torsional vibration torque is generated in the crankshaft.

According to an aspect of the present invention, there is provided a rotation transmission device including: a hub unit coupled to a crankshaft by a hollow; a pulley unit positioned at an outermost side of the hub and having a pulley groove formed at one side; An elastic part provided between the hollow of the hub and the pulley unit; And a friction member coupled to an outer side of the elastic portion and maintained in a state of being radially outwardly pressed by the elastic portion, wherein the friction member slips when a predetermined force or more is applied to the elastic portion.

The elastic portion may be composed of an elastic body provided outside the hollow and an outer sleeve surrounding the outermost surface of the elastic body.

The friction member may be coupled to the outer side of the outer sleeve.

The outer sleeve and the friction member may have the same height.

The elastic body may be donut-shaped.

The outer sleeve may be a ring shape having a predetermined height.

A hollow cylindrical portion protruding forward along the hollow outer peripheral surface may be formed in the hollow of the hub, and the elastic portion may be positioned along the outer circumference of the hollow cylindrical portion.

The elastic portion may further include an inner sleeve provided on an inner peripheral surface of the elastic body, and the cylindrical portion and the inner sleeve may abut against each other.

The other side of the pulley unit extends rearward and then bends to form a folded surface, and the folded surface is located inside the outermost side surface of the hub, and the friction member can be formed to abut the inside of the folded surface.

The elastic portion can form an inclined surface that decreases in height as the distance from the central axis increases.

A ring-shaped shaft cover is provided on the front surface of the interface between the elastic portion and the pulley and can be fastened to the pulley unit by a fastening member.

The elastic part forms an inclined surface that decreases in height as the distance from the center axis increases. The shaft cover is provided on the inclined surface and can be fastened by the fastening member.

Since the elastic body can be assembled in a pressurized state, the volume before assembly can be smaller than the volume after assembly.

According to the rotation transmitting device having the above-described structure, the durability and noise of the auxiliary machinery belt caused by excessive torsional vibration of the engine can be solved, and an excessive torsional vibration torque value is transmitted to the rotary device, And the durability and quality of the rotation transmitting device are increased. Further, the slip torque can be freely designed for each vehicle type by adjusting and combining the shape of the elastic body and the friction coefficient of the friction member, thereby increasing the degree of freedom of design.

1 is a side cross-sectional view of a conventional rotation transmitting device;
Fig. 2 is a view showing the operating state of Fig. 1; Fig.
3 is an exploded perspective view of a rotation transmitting device according to an embodiment of the present invention;
Fig. 4 is a side sectional view of Fig. 3; Fig.
Fig. 5 is a view showing the operating state of Fig. 3; Fig.

Hereinafter, a rotation transmitting device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The present invention relates to an isolation damper pulley of a vehicle, and more particularly to an isolation structure. The construction and effect of the isolation damper pulley are well known in Korean Patent Laid-Open No. 10-2006-0039435, and therefore, detailed description thereof will be omitted.

FIG. 3 is an exploded perspective view of a rotation transmitting device according to an embodiment of the present invention, FIG. 4 is a side sectional view of FIG. 3, and FIG. 5 is a view illustrating an operating state of FIG.

The rotation transmitting device according to the preferred embodiment of the present invention includes a hub 100 coupled to a crankshaft (not shown) by a hollow 110 and a hub 100 positioned at an outermost side of the hub 100, 310) are formed; An elastic part (500) provided between the hollow (110) of the hub (100) and the pulley unit (300); And a friction member 700 coupled to an outer side of the elastic part 500 and maintained in a state of being radially outwardly pressed by the elastic part 500 and slipping when a predetermined force is applied to the elastic part 500, .

The rotation transmitting device according to an embodiment of the present invention is coupled through a hub 100 having a hollow 110 formed in the crankshaft. The hub 100 is formed in a circular plate shape and a cylindrical cylindrical portion 130 protruding forward along the outer circumferential surface of the hollow 110 is formed in the hollow 110. The hollow cylindrical portion 130 is formed along the circumferential direction An outer frame part 150 protruding forward is formed. Therefore, it is preferable that the elastic part 500 is provided in the space formed between the cylindrical part 130 and the outer frame part 150. Accordingly, the elastic part 500 is positioned along the outer circumference of the cylindrical part 130 formed along the outer circumferential surface of the hollow 110 of the hub 100.

The elastic part 500 will be described in more detail. The elastic part 500 includes a ring-shaped inner sleeve 550 surrounded by the cylindrical part 130 and formed at a predetermined height, an elastic body 510 and an elastic body 510 provided in the inner sleeve 550, And an outer sleeve 530 surrounding the outermost surface of the outer sleeve 530. The elastic body 510 may be rubber or donut-shaped, and the outer sleeve 530 may be a ring-shaped one having a predetermined height. The inner sleeve 570 is provided on the inner circumferential surface of the elastic body 510 and is in close contact with the cylindrical portion 130. The elastic body 500 and the sleeves 530 and 550 may be formed in such a manner that they are vulcanized after the application of the adhesive.

The friction member 700 forms the same height as the outer sleeve 530 and is coupled to surround the outer side of the outer sleeve 530. The outer sleeve 530 and the friction member 700 may be coupled to each other by a press-fit structure by forced indentation. Therefore, the elastic part 500 is independently constructed in the rotation transmitting device by the friction member 700, so that the elastic part 500 can independently rotate.

Particularly, since the elastic body 510 of the elastic part 500 can be assembled in a pressed state, the volume before assembling becomes smaller than the volume after assembly. Therefore, after assembly, a force F for pressing radially outward is formed to continuously move the outer sleeve 530, the friction member 700, and the pulley unit 300 located outside the elastic body 510 radially outwardly And is held in a pressurized state. Therefore, when the crankshaft rotates normally, the hub 100, the elastic part 500, and the pulley unit 300 are closely contacted with each other while being pressed against each other and are integrally rotated when the crankshaft rotates.

The torsional vibration torque value transmitted from the crankshaft of the engine is transmitted in the direction of the arrow C as shown in Fig. However, when a predetermined torsional vibration torque value is transmitted from the crankshaft, a slip is generated between the outer sleeve 530 of the elastic part 500 and the friction member 700. When the slip is generated between the friction member 700 and the outer sleeve 530, the elastic part 500 is independently rotated separately from the pulley unit 300 and the hub 100, So that breakage is prevented (see Fig. 5 (b)).

In particular, the slip torque T is set by the formula T = FX. Here, F is a pressing force of the elastic body 510, which can be adjusted to the shape of an elastic body, and X is a coefficient of friction, and the slip torque can be freely set by adjusting the friction coefficient. Therefore, there is an advantage that the slip torque suitable for each vehicle can be customized according to the vehicle by suitably adjusting the friction coefficient X and the pressing force F.

A pulley groove 310 is formed at one side of the pulley unit 300 and a rear side of the pulley unit 300 is bent to form a curved surface 330. The bent surface 330 is positioned inside the outer frame 150 which is the outermost surface of the hub 100. The friction member 700 is positioned on the inner side of the folded surface 330 and is in contact with the friction member 700 so that the friction member 700 is pressed against the pulley unit 300, The elastic portion 500 and the friction member 700 rotate integrally.

The elastic part 500 forms an inclined surface 570 whose height decreases from the center axis. A ring-shaped shaft cover 900 is provided on the front surface of the interface between the elastic part 500 and the pulley unit 300. Accordingly, it is preferable that the shaft cover 900 is fastened to the pulley unit 300 by the fastening member 910 so as to increase the thrust fixing force with respect to the axial direction.

The effect of the rotation transmitting device of the present invention will be compared through FIG. 2 and FIG. FIG. 2 is a view showing an operation state of a conventional rotation transmitting device, in which the operation of the rotation transmitting device in a steady state is shown in (a). Referring to Fig. 2 (a), in the steady state, the pulley unit 30 and the elastic portion 50 are rotated together so that the line B is aligned. However, as shown in FIG. 2 (b), when the excessive torsional vibration torque value is transmitted during operation, the elastic portion 50 formed with the B 'line is broken due to the difference between the line B' and the line B ''.

Fig. 5 is a view showing an operating state of the rotation transmitting device of the present invention. 5 (b) showing the operating state, however, unlike FIG. 2 (b), even when a difference between the D 'line and the D' '' line occurs, the slip occurs by the friction member 700, The elastic portion 500 is independently rotated. Accordingly, the line D '' is separated from the line D 'and is independently rotated to prevent the elastic body 510 from being damaged. That is, in the present invention, the elastic portion 500 is separately rotated by the friction member 700, so that breakage of the elastic portion 500 is prevented even if a predetermined torsional vibration torque value is transmitted to the rotation transmitting device.

Therefore, the rotation transmitting device of the present invention can solve the problem of durability and noise of the auxiliary machinery belt caused by the excessive torsional vibration of the engine, and an excessive torsional vibration torque value is transmitted to the rotating concave device, Tearing and breakage of the rotation transmitting device is prevented, and the durability and quality of the rotation transmitting device are increased. Further, the slip torque can be freely designed for each vehicle type by adjusting and combining the shape of the elastic body and the friction coefficient of the friction member, thereby increasing the degree of freedom of design.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

100: Hub
110: hollow
130:
150:
300: Pulley unit
310: pulley groove
330: Bending face
500: elastic part
510: elastomer
530: outer sleeve
550: inner sleeve
570:
700: Friction member
900: Axle cover
910: fastening member

Claims

A pulley unit positioned at the outermost side of the hub and the hub coupled to the crankshaft by the hollow and formed with a pulley groove at one side;
An elastic part provided between the hollow of the hub and the pulley unit; And
And a friction member coupled to an outer side of the elastic portion and maintained in a state of being radially outwardly pressed by the elastic portion and slipping when a predetermined force or more is applied to the elastic portion,
Wherein a ring-shaped shaft cover is provided on a front surface of the interface between the elastic portion and the pulley unit, and the ring-shaped shaft cover is fastened to the pulley unit by the fastening member, thereby increasing the thrust fixing force in the axial direction.

The method according to claim 1,
Wherein the elastic portion comprises an elastic body provided outside the hollow and an outer sleeve surrounding the outermost surface of the elastic body.

The method of claim 2,
Wherein the friction member is coupled to the outer side of the outer sleeve.

The method of claim 2,
Wherein the outer sleeve and the friction member form the same height.

The method of claim 2,
Wherein the elastic body is donut-shaped.

The method of claim 2,
Wherein the outer sleeve is a ring-shaped one having a predetermined height.

The method of claim 2,
Wherein a hollow cylindrical portion is formed in the hollow of the hub along the outer circumferential surface of the hollow and the elastic portion is located along the outer circumference of the cylindrical portion.

The method of claim 7,
Wherein the elastic portion further includes an inner sleeve provided on an inner peripheral surface of the elastic body, and the cylindrical portion and the inner sleeve abut on each other.

The method according to claim 1,
Characterized in that the other side of the pulley unit extends rearward and then is bent to form a folded surface, the folded surface being located inside the outermost side surface of the hub, such that the friction member abuts the inside of the folded surface Delivery device.

The method according to claim 1,
Wherein the elastic portion forms an inclined surface that decreases in height as the distance from the central axis increases.

delete

The method according to claim 1,
Wherein the elastic portion forms an inclined surface that decreases in height as it is away from the central axis, and the shaft cover is provided on the inclined surface and is fastened by the fastening member.

The method of claim 2,
Wherein the elastic body can be assembled in a pressurized state, so that the volume before assembly is smaller than the volume after assembly.