JPS6338724A - Electromagnetic clutch device - Google Patents

Abstract

PURPOSE:To reduce shocks and noises generated when an armature departs from a rotating driver by providing a bisymmetrical leaf spring substance with the ends stationary portions which are fixed on either an armature or a driven shaft, and with the central stationary portion which is fixed on the other of the two. CONSTITUTION:A leaf spring substance 30 is formed in a symmetrical shape with respect to the direction of radiation passing through the central stationary portion 32, and therefore, when a coil 23 is electrified to attract an armature 15 to a pulley 20, the leaf spring substance 30 can be elastically deformed into a perfectly bisymmetrical shape without selecting the direction of rotation of a driven shaft 12. In addition, the ends stationary portions 31 at both ends of the leaf spring substance 30 are fixed on the armature 15. When the electrification to the coil 23 is cut off, and the armature 15 is caused to depart from the pulley 20 by the force of the leaf spring substance 30, a damper 36 comes in elastic contact with the armature 15 so that shocks and connection noises can be absorbed. Since the damper 36 is located at the center of the bisymmetrical leaf spring substance 30, even if the direction of rotation of the driven shaft 12 is varied, perfectly the same cushioning effect can be exercised.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the production of electromagnetic clutches that connect and disconnect power to, for example, vehicle coolers, superchargers, power steering, auto bombs, etc. The present invention relates to an improvement of a spring means for applying an M opening force.

``Prior Art and Its Problems'' First, referring to FIG. 6 and FIG. 713 is fixed.An annular armature 15 is located on the outer periphery of this hob 13, and is fixed to this hob 13 via a plurality of leaf springs 16.The inner end of the leaf spring 16 is Rivet 16
a to the hob 13, and the outer end is similarly fixed to the armature 15 by a head 16b, which gives the armature 15 a force to move leftward in Figure 6, and normally keeps its suction surface 15a It acts to separate the pulley 20 from the suction surface 20a.

The pulley 20 is mounted on a fixed frame 21 of the compressor 11 with a bearing 2.
It is rotatably supported via 2.

A coil 23 as an electromagnetic body located within the annular space 20b of the pulley 20 is fixed to the fixed frame 2, and when the coil 23 is energized, the armature 5 moves into the leaf spring 16.
is attracted toward the pulley 20 against the elasticity of the pulley 20 and the armature 15, that is, the driven shaft 12 are integrated. 20
C115c is a magnetic path forming hole drilled in the pulley 20 and the armature 15, respectively. Through the magnetic path forming holes 20c and 15c, magnetic flux flows between the pulley 20 and the armature 15 as shown by the arrow in FIG. It gets sucked in.

The pulley 2o receives the driving force of the engine via the belt 24.

By the way, in the conventional electromagnetic clutch snow making device described above, in order to exhibit the spring properties of the leaf spring 16 when connecting the rotating pulley 20 and the armature 15, and to improve its durability, the electromagnetic clutch is adapted to the direction of rotation of the driven shaft 12. However, it is necessary to install the leaf spring 16 at an angle. Arrow A in FIG. 1 indicates the direction of rotation of the driven shaft 12 (armature 15); however, the driven shaft 12
The direction of rotation varies depending on the type of vehicle and the type of equipment that requires an electromagnetic clutch. For this reason, in the conventional electromagnetic clutch device, it was necessary to prepare leaf springs 16 with different directions and use them depending on the application. In addition, in the conventional device, when the power to the coil 23 is cut off, the armature 15 is moved to the pulley 2 by the force of the leaf spring 16.
0, but at this time the armature 15 and leaf spring body 16
There was a problem in that collisions caused large shocks and connection noises.

``Object of the Invention'' The present invention solves the problems associated with conventional electromagnetic clutches, eliminates the need to select the direction of rotation of the driven shaft, and allows the armature to move away from the rotating drive body. The purpose of the present invention is to obtain an electromagnetic clutch device M capable of reducing shock and noise caused by the clutch.

``Summary of the Invention'' As a result of researching the above-mentioned problems in electromagnetic clutch devices, the present invention has discovered that conventional leaf springs have an armature and a hob on the inside and outside, respectively, which are fixed at a single point. The present invention was completed based on this conclusion, and was completed based on this conclusion. A left-right symmetrical leaf spring having two ends fixed at two points spaced apart in the circumferential direction on either the armature side or the hob side, and a center fixed part between the two fixed ends on the other side. By using such a symmetrical leaf spring body, there is no need to choose the direction of rotation of the driven shaft.

This leaf spring body can be made into a single spring member by making both end fixing parts of adjacent leaf spring bodies common, which can contribute to a reduction in the number of parts.

Further, this leaf spring body can be provided with a damper that makes elastic contact with the armature at the symmetrical center of the snow. By providing the damper at the symmetrical central position in this way, it is possible to soften the shock without having to choose the direction of rotation of the driven shaft.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. 1 to 3 show a first embodiment of the present invention. FIG. 1 corresponds to FIG. 1 of the conventional device, and the same components are given the same reference numerals. Further, a sectional view of the electromagnetic clutch device of the present invention appears similar to FIG. 6.

The leaf spring body 30, which is a feature of the present invention, is formed in a semicircular arc shape in this embodiment, and as shown in FIG. Further, a central fixing portion (hole) 32 is formed in the central portion. The both end fixing parts 31.31 are fixed to the armature 15 at circumferentially spaced positions via fixing rivets 33, and the central fixing part 32 is fixed to the hob 13 via fixing rivets 34. Further, a damper arm 35 is formed on the leaf spring body 30 and extends in the radial direction of the driven shaft 12 through the central fixed portion 32. A damper 36 made of an elastic body is provided at the tip of the damper arm 35. There is.

This damper 36 makes elastic contact with the armature 15.

In the present electromagnetic clutch device having the above configuration, since the leaf spring body 30 is symmetrical in the radial direction passing through the central fixed portion 32, the armature 15 is connected to the pulley 20 by energizing the coil 23.
When suction is applied to the driven shaft I2, the driven shaft I2 is elastically deformed in both the rotational direction and the axial direction. That is, the leaf spring body 3o can be elastically deformed completely symmetrically without selecting the direction of rotation of the driven shaft 12. Further, since the leaf spring body 30 is fixed to the armature 15 or the fixed portions 3 at both ends thereof, the connection strength is excellent. The power to the coil 23 is roughly cut off, and the armature 15 pulls the pulley 2 due to the force of the leaf spring body 30.
When separating from 0, damper 36 or amateur 15
Due to the elastic contact, the shock and connection are alleviated.

Since this damper 36 is located at the center of the left-right symmetrical leaf spring body 30, it exhibits exactly the same damping effect even if the rotation direction of the driven shaft 12 is different.

Since the leaf spring body 30 of this embodiment has a semicircular arc shape, it has the advantage of being easy to bend and having a long effective length. The basic effect of the present invention is not impaired even if the V-shaped leaf spring body 30 is formed such that both end fixing parts 31 are fixed to the hob 13 (the center fixing part 32 is fixed to the armature 15). good.

FIG. 5 shows a slightly different embodiment of the present invention. In this embodiment, three imaginary leaf spring bodies 30' are formed from a combination of two flat circular arcs, and adjacent leaf springs body 3
This is an embodiment in which the leaf spring body 30 is constructed from a single spring member by making the fixed portions 31'' at both ends of 0° common.

According to this embodiment, the number of leaf spring bodies is reduced to a single number, thereby reducing the number of parts and achieving a rough cost reduction effect. In addition, in this embodiment, the central fixing part 32 fixed to the hob 13 side can also be seen as both-end fixing parts.

From this point of view, the damper 36 is located not at the center of the symmetrical leaf spring body 30 but outside the hob side rivet in the radial direction.

"Effects of the Invention" As described above, according to the present invention, the leaf spring body connecting the armature and the hob has two end fixing parts fixed to either one of the armature and the hob, and a central fixing part fixed to the other. Because it is symmetrically formed, no matter which direction the driven shaft rotates, it is deflected in the same direction in the rotational direction and in the axial direction, and the impact when the armature and the rotary drive body are connected or disconnected. can be absorbed. Therefore, a single specification can handle both forward and reverse rotations of the driven shaft. In addition, this leaf spring body is equipped with a damper that connects and disconnects from the armature at the center of the fixed portions at both ends, so that the shock caused when the armature separates from the rotary drive body and before connection is prevented, regardless of the direction of rotation of the driven shaft. It can be relaxed.

[Brief explanation of drawings]

Fig. 1 is a front view of the electromagnetic clutch device of the present invention as seen from the end face on the armature side, Fig. 2 is a sectional view taken along the line 11-11 in Fig. 1, and Fig. 3 is a front view showing the single shape of the leaf spring body. Figure 4 (front view showing another example of the shape of the cutting board spring body, Figure 5 is a front view showing another embodiment of the present invention, a front view similar to Figure 1, Figure 6 is a front view showing another example of the shape of the cutting board spring body). Fig. 1 is a longitudinal sectional view of the assembled state of the entire electromagnetic clutch device, and is a front view seen from the armature side showing the shape of a conventional leaf spring. 11... Compressor, 12... Driven shaft, T3...
・Hob, 15--Amateur, 15a...Suction surface,
20... Boot (rotary drive body), 20a... Suction surface, 21... Fixed frame, 22... Bearing, 23... Coil (electromagnetic body), 30... Leaf spring body, 3 ]...Both end fixing part, 32...Central fixing part, 33.34-...Fixing rear part, 35...Dumper arm, 36...Damper.

Claims (3)

[Claims] (1) A driven shaft that integrally has a hob at the end: A rotary drive body located on the outer periphery of this driven shaft: A armature that has a suction surface facing the suction surface of this rotary drive body: This armature and the hob and an electromagnetic body that resists this spring means and attracts and integrates the armature with the rotary drive body when energized. In an electromagnetic clutch device,
Each of the plurality of spring means has two end fixing portions spaced apart in the circumferential direction on either the armature side or the hob side, and a central fixation point between the two end fixing portions on the other side. An electromagnetic clutch device comprising a left-right symmetrical leaf spring body having a left-right symmetrical leaf spring body. (2) In claim 1, the leaf spring body includes:
An electromagnetic clutch device is equipped with a damper made of an elastic body that makes elastic contact with the armature at the symmetrical center position. (3) In claim 1 or 2, the electromagnetic clutch device is characterized in that the plurality of leaf spring bodies are constituted by a single spring member in which the fixed portions at both ends of adjacent leaf spring bodies are common. .