JP2507208Y2 - Electromagnetic clutch / brake field assembly fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an electromagnetic clutch / brake, and more specifically, in transmission and release of power or braking and release of rotation, an intermediate position between a driving side and a driven side. Electromagnetic clutch to be placed /
A field in an electromagnetic clutch / brake in which the field assembly in the brake (hereinafter referred to as the field assembly) and the armature are coaxially arranged in the axial direction, and the operation as the clutch / brake is transmitted in the axial direction. The fixing structure of the assembly.

[Prior Art] In the industry, power and load are controllably connected, and the connection is released, the rotation of the rotating body is accelerated, decelerated, or stopped. BACKGROUND OF THE INVENTION Electromagnetic clutches / brakes are used in many other applications when controlling the tension of the work in the process of driving or drawing out or winding a long material such as a wire or a film.

Among these electromagnetic clutches / brakes, there is a type that transmits power in the radial direction, that is, a type in which a brake shoe arranged on the outer periphery of the brake drum like a drum type is pressed against the outer periphery of the brake drum, but there is a large type. The part is of a type in which the operation as a clutch / brake is transmitted in the axial direction, and among them, the field assembly is arranged on the fixed side, and the coil is excited to activate or deactivate the field assembly. The majority belong to either type.

In the field assembly of this type, conventionally, when assembling, the following procedure was used.

FIG. 3 is a side sectional view showing the structure of a typical field assembly according to the prior art.

Reference numeral 1 in the figure indicates the entire field assembly,
Reference numeral 2 is a yoke, 3 is an annular coil, 4 is an annular groove opened in the yoke 2 for accommodating the annular coil 3, and 5
Is a through hole that extends from the outer periphery of the yoke to the annular groove that houses the coil 3, and is for guiding the lead wire 6 from the external power source to the coil 3. Reference numeral 7 denotes a molding agent for filling the gap between the annular groove 4 and the coil 3 after the coil 3 is housed in the annular groove 4, and a hardening agent is added to the thermosetting plastic. It is filled by injection and cured at room temperature or medium temperature.

In this way, the gap between the annular groove 4 and the coil 3 is filled with the molding agent to prevent the coil from moving or deforming due to vibration during use and the resulting deterioration in performance.

[Problems to be Solved by the Invention] Simply by providing the annular groove 4 and injecting and filling the gap between the annular groove 4 and the coil 3 with the molding agent, the field assembly can be performed by repeating operation and opening during use. Due to the axial vibration and shock applied to the lee, the coil and the molded part come out together in the axial direction, and in the case of a clutch, the field assembly is performed by the torque given by the rotating member in the connected state. It is easy for the Lee to rotate due to the torque and to shift its position in the circumferential direction.

As a countermeasure against this, as shown in FIG. 3, at least one mold holding hole communicating from the outer circumference of the yoke to the annular groove 4 is provided so that the molding agent is filled up to the inside of the mold holding hole. In addition, it was necessary to prevent axial slip-out and displacement in the circumferential direction.
However, in order to adopt such a prevention method, the number of steps is increased because the mold holding hole is opened separately from the lead wire hole, and the mold holding hole communicates with the annular groove 4 from the outer circumference of the yoke. There is still a problem that a means for preventing the molding agent from flowing out at the time of filling is required, and further, the finish after the completion of the field assembly is not preferable in terms of appearance.

[Means for Solving the Problem] When drilling a lead wire hole instead of forming a mold holding hole communicating with the annular groove 4 from a position different from the lead wire hole on the outer periphery of the yoke as in the conventional case Then, the through hole of the outer peripheral magnetic pole portion of the yoke is extended beyond the annular groove and further reaches the inner peripheral magnetic pole portion to form a mold holding hole. However,
In that case, the tip of the mold holding hole is a blind hole that does not reach the axial hole through which the shaft passes.

[Operation] When drilling the lead wire hole, the depth can be extended only slightly, so the increase in the working process is negligible, and the tip does not communicate with the outside. Since the holes are formed, the molding agent does not flow out during filling and the finished appearance is good.

[Embodiment] FIG. 1 is a side sectional view showing a preferred embodiment of the present invention, and FIG. 2 is a front view showing the embodiment shown in FIG. The same or equivalent members as those shown in FIG. 3 in these figures will be described using the same reference numerals.

In FIG. 1, reference numeral 8'denotes an extension of the lead wire hole 5 and extends radially inward beyond the annular groove 4 accommodating the annular coil 3 to reach the inner magnetic pole portion 2 ". Although it is the opened mold holding hole, it is formed as a blind hole that does not reach the shaft hole 9 through which the shaft passes.

In this way, after the mold holding hole 8'is opened, the molding agent is injected and filled from the lead wire hole, the molding agent is filled with the annular groove 4 for housing the coil 3 and the blind hole 8 as the molding agent holding hole. It is extremely smoothly flowed into and filled into the inside of ′, and after solidification, the coil and the molding agent are integrated and prevent the coil from rotating and moving in the axial direction and the circumferential direction.

[Advantage of the Invention] The lead wire hole 5 is used as an extension portion of the lead wire hole 5 and extends inward in the radial direction beyond the annular groove 4 to reach the inner peripheral magnetic pole portion. Since it is possible to prevent the axial movement or the circumferential movement of the coil and the molding agent, the contribution to the improvement of the performance and the cost reduction of the electromagnetic clutch / brake field assembly is great.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a preferred embodiment of the present invention, FIG. 2 is a front view showing the embodiment shown in FIG. 1 without a molding agent, and FIG. 3 is a conventional electromagnetic clutch / It is a sectional side view which shows the assembly and fixed state of the field assembly of a brake. Reference numerals in the drawing 1: field assembly, 2: yoke, 3: coil, 4: annular groove, 5: lead wire hole, 6: lead wire, 7: molding agent, 8,
8 ': Mold holding hole, 9: Shaft hole.

Claims (1)

(57) [Scope of utility model registration request] 1. A yoke having a shaft hole concentric with a central axis in a radial direction, a coil housed in an annular groove of the yoke, and a gap between the coil and a wall of the annular groove. A mold part filled with a molding agent and hardened, and a lead wire hole for passing a lead wire which is opened from the outer circumferential surface of the yoke toward the annular groove and leads an electric current from an external power source to the coil. And a field assembly of an electromagnetic clutch / brake comprising: a lead wire hole extending radially inward beyond the annular groove to an inner magnetic pole portion to a portion not reaching the shaft hole. A mold holding hole as an extension of the lead wire hole, wherein the mold agent is further injected and filled into the mold holding hole, cured together with the coil, and fixed in the annular groove. The fixed structure of the electromagnetic clutch / brake field assembly.