JP2006292120A - Electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic clutch in which a torque transmission capability between a rotor and an armature does not deteriorate even when a gap is generated between a hub rotor and a rotor in a strut direction.
An exciting coil 20, a rotor 50, a hub rotor 30, a shell 40, and an armature 60 are provided, and a magnetic flux f generated by the exciting coil 10 causes the rotor 50, the hub rotor 30, the shell 40, and the armature 60 to move. In the electromagnetic clutch 10 that forms a magnetic circuit that passes therethrough, a substantially cup-shaped contact surface T1 having an axial contact surface through which the magnetic flux f generated by the exciting coil 20 passes is formed between the rotor 50 and the hub rotor 30. It was set as the structure.
[Selection] Figure 1

Description

  The present invention relates to an electromagnetic clutch, and more particularly to an improvement of an electromagnetic clutch that suppresses a decrease in transmission torque.

  Conventional electromagnetic clutches such as electromagnetic tooth clutches have a conventional technique as shown in Patent Document 1, but hereinafter, magnetic flux generated by an exciting coil passes through a rotor, a hub rotor, a shell, and an armature so that a magnetic circuit is formed. An electromagnetic clutch having a structure to be formed will be described with reference to FIG.

First, a basic configuration of a conventional electromagnetic clutch will be described with reference to FIG.
FIG. 5 is an upper half vertical side view showing the basic configuration and basic operation of a conventional electromagnetic clutch.
As shown in FIG. 5, the conventional electromagnetic clutch 100 of this type has an exciting coil 110, a hub rotor 120, a shell 130, a rotor 140, and an armature 150 as main components.
In the conventional electromagnetic clutch 100, the contact surface T4 of the rotor 140 and the hub rotor 120 is the end surface of the hub rotor 120 and is formed in the radial direction.

  In this configuration, in the conventional electromagnetic clutch 100, as shown in FIG. 5, when the exciting coil 110 is energized from a power source (not shown), the magnetic flux f generated by the exciting coil 110 is changed to the hub rotor 120, the shell 130, and the rotor 140. And a magnetic circuit passing through the armature 150 is formed.

  In this state, in the conventional electromagnetic clutch 100, a magnetic attraction force is generated between the rotor 140 and the armature 150, and the friction force generated by the contact between the friction surfaces of the rotor 140 and the armature 150 causes the rotor 140 and the armature 150 to contact each other. Torque is transmitted.

  On the other hand, when the energization of the electromagnetic coil 110 is stopped, the magnetic attractive force between the rotor 140 and the armature 150 disappears, the friction surface between the rotor 140 and the armature 150 is separated, and torque is transmitted between the rotor 140 and the armature 150. Disappear.

JP 2004-332825 A

Next, problems of the conventional electromagnetic clutch will be described with reference to FIG.
FIG. 6 is an upper half longitudinal side view for explaining the problems of the conventional electromagnetic clutch.

  In the conventional electromagnetic clutch, a gap may be generated in the axial direction as indicated by G2 in FIG. 6 due to various causes in the assembled state of the hub rotor 120 and the rotor 140.

In this case, as described above, in the conventional electromagnetic clutch 100, the contact surface T4 of the rotor 140 and the hub rotor 150 is formed in the radial direction at the end surface of the hub rotor 120. It is formed between the hub rotor 120 and the rotor 140.
Since air has a lower magnetic permeability than the rotor 130 and the hub rotor 140, the air becomes a large magnetic resistance of the magnetic circuit in which the magnetic flux generated by the exciting coil 110 is formed.

  When the magnetic resistance of the magnetic circuit is increased, naturally, the magnetic force of the exciting coil 110 is reduced, and as a result, the transmission capability of the torque between the rotor 140 and the armature 150 is reduced, and the quality of the electromagnetic clutch 100 becomes unstable. Have a problem.

  On the other hand, as a countermeasure, if it is attempted to increase the assembly accuracy so that the gap G2 between the hub rotor 120 and the rotor 140 does not occur, the processing accuracy of each component must be increased, and the manufacturing cost of the electromagnetic clutch 100 increases. A new problem arises.

  The present invention solves the above problems (problems) and provides an electromagnetic clutch in which the torque transmission capability between the rotor and the armature does not decrease even when a gap occurs in the struss direction between the hub rotor and the rotor. Objective.

  The electromagnetic clutch according to the present invention includes an exciting coil, a rotor, a hub rotor, a shell, and an armature, and the magnetic flux generated by the exciting coil is the rotor, the hub rotor, and the armature. In the electromagnetic clutch that forms a magnetic circuit that passes through the shell and the armature, an axial contact surface through which the magnetic flux generated by the exciting coil passes is formed between the rotor and the hub rotor. did.

  The electromagnetic clutch according to claim 2 is configured such that a contact surface formed between the rotor and the hub rotor is substantially cup-shaped.

  The electromagnetic clutch according to claim 3 is configured such that a contact surface formed between the rotor and the hub rotor has a cylindrical shape on the inner diameter side of the hub rotor.

  The electromagnetic clutch according to claim 4 is configured such that a contact surface formed between the rotor and the hub rotor has a cylindrical shape on the outer diameter side of the hub rotor.

Since the electromagnetic clutch of the present invention is configured as described above, it has the following excellent effects.
(1) If comprised as described in Claim 1, even when the clearance gap generate | occur | produces in the axial direction between a rotor and a hub rotor, the fall of the transmission capability of torque can be suppressed as much as possible.
(2) Further, the machining accuracy in the axial direction of the electromagnetic clutch has a margin, and the machining cost of the electromagnetic clutch can be reduced, and the quality can be stabilized.
(3) Specifically, the contact surface between the rotor and the hub rotor may be formed as in claims 2 to 4.

An embodiment of an electromagnetic clutch according to the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 and FIG. 2 are upper half longitudinal side views for explaining the basic configuration and basic operation of the electromagnetic clutch of the present invention.

First, the basic configuration of the electromagnetic clutch of the present invention will be described with reference to FIG.
The main configuration of the electromagnetic clutch 10 of the present invention includes an exciting coil 20, a hub rotor 30, a shell 40, a rotor 50, and an armature 60, similar to the conventional electromagnetic clutch 100 shown in FIG. 5, and is generated by the exciting coil 20. The magnetic flux f that passes through the hub rotor 30, the shell 40, the rotor 50, and the armature 60 forms a magnetic circuit, and controls transmission of torque by turning on and off the current to the exciting coil 20.

On the other hand, in the electromagnetic clutch 10 of the present invention, an axial contact surface for allowing the magnetic flux f generated by the exciting coil 20 to pass between the rotor 50 and the hub rotor 30, and a radial contact surface at the end surface of the hub rotor 30. It has the characteristic on the structure in that the substantially cup-shaped contact surface T1 is formed.
With such a configuration, as shown in FIG. 1, when there is no gap in the axial direction between the rotor 50 and the hub rotor 30, the axial contact surface is provided and the end surface of the hub rotor 30 is also contacted in the radial direction. As a result, the contact surface T1 between the rotor 50 and the hub rotor 30 can be almost maximized, and the magnetic resistance can be reduced.

  On the other hand, as shown in FIG. 2, even when a gap G1 is generated in the axial direction between the rotor 50 and the hub rotor 30, most of the magnetic flux f is air having a large magnetic resistance because it has a contact surface in the axial direction. By avoiding the layers and passing through the axial contact surfaces of the rotor 50 and the hub rotor 30, the magnetic resistance does not increase significantly. As a result, the torque transmission capability between the rotor 50 and the armature 60 is reduced. Is not connected.

  As a result, even when a gap is formed in the strut direction of the rotor 50 and the hub rotor 30, a reduction in torque transmission capability of the electromagnetic clutch 10 can be suppressed as much as possible, so that the machining accuracy in the axial direction of the electromagnetic clutch 10 has a margin. The machining cost of the electromagnetic clutch 10 can be reduced, and the quality can be stabilized.

The electromagnetic clutch of the present invention is not limited to the above-described embodiment, and various modifications can be made.
In the above embodiment, the contact surface between the rotor and the hub rotor has been described as having a substantially cup shape. However, the contact surface T2 between the rotor 50B and the hub rotor 30 is located on the inner diameter side of the hub rotor 30 as in the electromagnetic clutch 10B shown in FIG. Alternatively, it may be formed in a cylindrical shape.
Further, like the electromagnetic clutch 10 </ b> C shown in FIG. 4, the contact surface T <b> 3 between the rotor 50 </ b> C and the hub rotor 30 may be formed in a cylindrical shape on the outer diameter side of the hub rotor 30.

It is an upper half vertical side view which shows one Embodiment of the electromagnetic clutch of this invention. It is an upper half vertical side view explaining the basic operation | movement of the electromagnetic clutch of this invention. It is a principal part upper half longitudinal side view explaining other embodiment of the electromagnetic clutch of this invention. It is a principal part upper half longitudinal side view explaining other embodiment of the electromagnetic clutch of this invention. It is an upper half vertical side view explaining the basic composition of the conventional electromagnetic clutch. It is an upper half vertical side view explaining the problem of the conventional electromagnetic clutch.

Explanation of symbols

10: Electromagnetic clutch
20: Excitation coil
30: Hub rotor
40: Shell
50: Rotor
60: Armature
f: Magnetic flux T1, T2, T3: Contact surface

Claims (4)

In an electromagnetic clutch comprising an exciting coil, a rotor, a hub rotor, a shell, and an armature, and a magnetic flux generated by the exciting coil forms a magnetic circuit that passes through the rotor, the hub rotor, the shell, and the armature. ,
An electromagnetic clutch in which an axial contact surface through which a magnetic flux generated by the exciting coil passes is formed between the rotor and the hub rotor. The electromagnetic clutch according to claim 1, wherein a contact surface formed between the rotor and the hub rotor is substantially cup-shaped. The electromagnetic clutch according to claim 1, wherein a contact surface formed between the rotor and the hub rotor has a cylindrical shape on an inner diameter side of the hub rotor. The electromagnetic clutch according to claim 1, wherein a contact surface formed between the rotor and the hub rotor has a cylindrical shape on an outer diameter side of the hub rotor.

Images