JP2005351406A - Crank pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crank pulley capable of suppressing fluctuation of rotation of a crank shaft and auxiliary machinery. <P>SOLUTION: When a driving member 2 provided with a plurality of permanent magnets 4 starts to rotate, force in the direction following the permanent magnets 4 acts in each copper plate 5 by current flowing in respective copper plates 5 mounted on a driven member 3, which rotates with the driving member 2. Since the driven member 3 rotates at almost the same speed by inertia even when fluctuation of rotation occurs in the crank shaft 1 with which the driving member 2 is tightened, fluctuation of rotation is not transmitted to the auxiliary machinery to keep a smooth operation condition. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a crank pulley.

  A belt for driving auxiliary machines such as an alternator, a water pump, an oil pump, and an air conditioning compressor is wound around a crank pulley fastened to a crankshaft end of a vehicle engine (see, for example, Non-Patent Document 1). ).

Furthermore, tension is applied to the belt using a belt tensioner so that the belt does not slip with respect to the crank pulley or the rotation transmission member of the auxiliary machine (see, for example, Non-Patent Document 2 and Non-Patent Document 3).
Toyota Technical Association, “Automotive Encyclopedia” revised edition, Toyota Motor Corporation, December 27, 1988, p170, p171, p. 338 Car Glossary Dictionary Compilation Committee, “Car Glossary Dictionary [2nd edition] popular version”, Sankai-do Co., Ltd., March 1, 2003, p471 Working Vehicles No. 25 POTO PUBLISHING CO., LTD., April 5, 2004, p34

  However, in those disclosed in Non-Patent Documents 1 to 3, since the transmission of the rotational motion from the crankshaft to the auxiliary machine depends on the friction between the members, the rotation fluctuation of the crankshaft is caused in the auxiliary machine. It may be difficult to maintain smooth driving conditions.

  In addition, when the electromagnetic clutch attached to the air conditioning compressor is in the engaged state, the engine load increases rapidly, which causes the crankshaft rotation fluctuation.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a crank pulley that can suppress rotational fluctuations of the crankshaft and the auxiliary machinery.

  In order to achieve the above object, the invention described in claim 1 is a drive member that rotates together with a crankshaft, and a driven member that is pivotally supported so as to surround the drive member in the circumferential direction and can transmit a rotational motion to an auxiliary machine. A member, a magnet mounted on the outer peripheral surface of the drive member, and a conductor mounted on the inner peripheral surface of the driven member.

  According to a second aspect of the present invention, there is provided a driving member that rotates together with the crankshaft, a driven member that is pivotally supported so as to surround the driving member in the circumferential direction, and that can transmit rotational motion to the auxiliary machine, and an outer peripheral surface of the driving member And a magnet mounted on the inner peripheral surface of the driven member.

  In the first aspect of the present invention, when the drive member equipped with the permanent magnet starts to rotate, the current flowing through the copper plate attached to the driven member causes a force in the direction of following the permanent magnet to act on the copper plate. The member rotates with the drive member.

  In the invention described in claim 2, when the driving member mounted with the copper plate starts to rotate, the current flowing through the copper plate causes a force in the direction of following the copper plate to act on the permanent magnet mounted on the driven member. Rotates with the drive member.

  According to the crank pulley of the present invention, the following excellent effects can be obtained.

  (1) Even when rotational fluctuation occurs in the crankshaft, the driven member rotates at almost the same speed due to inertia, so that the rotational fluctuation is not transmitted to the auxiliary machine and a smooth operation state can be maintained.

  (2) When the work of the auxiliary machine increases at a time, the engine load does not increase rapidly, and the crankshaft rotation fluctuation due to this does not occur.

  (3) Since the driven member surrounds the drive member in the circumferential direction, the dimension in the axial direction can be shortened.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show an example of an embodiment of a crank pulley according to the present invention. A drive member 2 is fastened with bolts to the end of the crankshaft 1 and is pivotally supported so as to surround the drive member 2 in the circumferential direction. A driven member 3 around which a belt (not shown) for transmitting rotational motion to the machine is wound, and a plurality of permanent magnets 4 and a copper plate 5 are provided.

  The drive member 2 has a large outer diameter portion 6 that is coaxially in contact with the end surface of the crankshaft 1 and a small outer diameter portion 8 that is coaxially connected to the large outer diameter portion 6 and is fitted with an inner race of a radial bearing 7. doing.

  A damper mass 9 having a shape surrounding the end portion of the crankshaft 1 in the circumferential direction is bolted to the large outer diameter portion 6, and torsional vibration of the crankshaft 1 can be suppressed by resonance of the damper mass 9.

  The driven member 3 includes a large inner diameter portion 10 that forms a gap with respect to the outer peripheral surface of the large outer diameter portion 6 of the driving member 2, and a small outer diameter that is connected to the outer race of the radial bearing 7. And an inner diameter portion 11.

  The permanent magnets 4 are mounted on the outer peripheral surface of the large outer diameter portion 6 of the drive member 2 so as to be arranged at equal intervals, and the copper plates 5 are arranged at equal intervals on the inner peripheral surface of the large inner diameter portion 10 of the driven member 3. It is attached.

  That is, when the drive member 2 fastened to the crankshaft 1 is rotated by the start of the engine and the plurality of permanent magnets 4 arranged in an annular shape start moving in the circumferential direction, the eddy currents flowing inside the respective copper plates 5 A force in the direction of following the permanent magnet 4 acts on the copper plate 5, and the driven member 3 rotates together with the drive member 2.

  The driven member 3 starts to rotate later than the driving member 2 when the engine is started, but the driving member 2 and the driven member 3 rotate at a constant speed as the engine speed increases.

  The driven member 3 that is not fastened to the drive member 2 rotates at almost the same speed due to inertia without being influenced by the drive member 2 even when the crankshaft 1 is subjected to rotational fluctuations. Therefore, a smooth driving state can be maintained.

  When the electromagnetic clutch attached to the air conditioning compressor is in the engaged state, that is, when the work of the auxiliary machine is increased at once, the engine load does not increase rapidly, and the activation of the air conditioning compressor is Does not cause rotational fluctuation.

  The positional relationship between the permanent magnet 4 and the copper plate 5 may be reversed. The copper plate 5 is mounted on the outer peripheral surface of the large outer diameter portion 6 of the driving member 2 so as to be arranged at equal intervals, and the permanent magnet 4 is larger than the driven member 3. A similar effect can be obtained even when a configuration in which the inner diameter portion 10 is mounted so as to be arranged at equal intervals is adopted.

  Furthermore, since the driven member 3 surrounds the drive member 2 in the circumferential direction, the dimension of the crank pulley in the axial direction can be shortened.

  Note that the crank pulley of the present invention is not limited to the above-described embodiment, and a metal other than copper can be adopted for the conductor, and other modifications can be made without departing from the scope of the present invention. Of course.

  The crank pulley of the present invention can be applied to various vehicle types.

It is an assembly state conceptual diagram showing an example of an embodiment of a crank pulley of the present invention. It is an exploded state conceptual diagram showing an example of an embodiment of a crank pulley of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crankshaft 2 Drive member 3 Driven member 4 Permanent magnet 5 Copper plate (conductor)
6 Large outer diameter (outer peripheral surface)
10 Large inner diameter (inner peripheral surface)

Claims (2)

  A drive member that rotates together with the crankshaft, a driven member that is pivotally supported so as to surround the drive member in the circumferential direction, and that can transmit rotational motion to the auxiliary machine; a magnet mounted on the outer peripheral surface of the drive member; A crank pulley comprising a conductor attached to an inner peripheral surface.   A driving member that rotates together with the crankshaft, a driven member that is pivotally supported so as to surround the driving member in the circumferential direction, and that can transmit rotational motion to the auxiliary machine; a conductor mounted on the outer peripheral surface of the driving member; and a driven member And a magnet mounted on the inner peripheral surface of the crank pulley.

Images