JP2590526Y2 - Transmission housing rib structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rib structure of a housing in a transmission using an electromagnetic clutch, for example, an electromagnetic powder clutch.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, an electromagnetic powder clutch has a rotor 2 spline-connected to a transmission input shaft 1 and a magnetic powder 3 outside the rotor 2.
And a clutch yoke 5 that is arranged to face the input shaft 1 via a bearing 4 with a gap for accommodating the same. A coil 6 is housed inside the clutch yoke 5,
The coil 6 is energized by a brush 8 which is in contact with a slip ring 7 which is arranged on the outer periphery of the input shaft 1 with a gap therebetween. The energization of the coil 6 turns the magnetic powder 3 into a solid state, Is transmitted to the clutch yoke 5.

The brush 8 and the brush holder 9 supporting the brush 8 are housed in a transmission housing 10 as shown in FIGS.
The rib structure of the transmission housing 10 in such a housing portion includes an annular portion 10a surrounding the input shaft 1 together with the slip ring 7, and radial portions 10b to 10b extending outward from the annular portion 10a.
“a” is one in which the insertion hole 11 of the brush 8 is formed.

[0004]

However, in such a rib structure of the transmission housing 10, when lubricating oil is applied to the upper part of the transmission housing 10, as shown in FIG. There is a problem that oil flows toward the insertion hole 11 of the brush 8 and lubricating oil is applied to the brush 8 and the slip ring 7 to cause poor conduction, which may cause the clutch to malfunction.

[0005]

In order to solve the above-mentioned problems, a rib structure of a transmission housing according to the present invention has an annular portion surrounding an input shaft of an electromagnetic clutch together with a slip ring on which a brush for energizing the electromagnetic clutch abuts. And a radial structure extending radially outward from the annular portion, the lubricating oil having a radial rib disposed above a brush holder holding the brush and having a radial rib flow down from above the transmission housing. Are formed obliquely with respect to the radial direction so as to flow to the opposite side of the brush holder.

[0006]

According to the rib structure of the transmission housing of the present invention, the radial rib disposed above the brush holder is inclined obliquely to the radial direction so that the lubricating oil flowing down from the upper side of the transmission housing flows to the opposite side of the brush holder. Since the lubricating oil is formed, it is possible to prevent the lubricating oil from flowing toward the brush holder and entering the contact portion between the brush and the slip ring.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a rib structure of a transmission housing according to an embodiment of the present invention will be described with reference to FIGS. The present embodiment is applied to the same electromagnetic powder clutch as the conventional one shown in FIG.
And an annular portion 10a that surrounds the
Radial portions 10b-1 extending outward from this annular portion 10a
1b, the radial ribs 12 arranged above the brush holder 9 and the radial ribs 13 adjacent to the radial ribs 12 are provided with lubricating oil flowing down from the upper side of the housing 10 as shown in FIG. The oil is formed obliquely with respect to the radial direction so that the oil flows to the opposite side of the brush holder 9, and in particular, the radial rib 12 above the brush holder 9 is arranged close to the upper side of the brush holder 9. Further, a flow groove 14 that allows the lubricating oil to flow further downward is formed in the radial portion 10 b below the radial rib 13.

On the other hand, a circumferential groove 15 is formed in the wall portion of the transmission housing 10 which faces the tip end of the brush holder 9 and the input shaft 1 in the axial direction. Groove 15 to brush holder 9
Flow groove 1 formed in radial portion 10b located below
6 and fall downward.

That is, in the rib structure of this embodiment, the lubricating oil flowing down from above the transmission housing 10 is guided to the opposite side of the brush holder 9 by the radial ribs 12 and 13 arranged above the brush holder 9. Also, the lubricating oil that escapes from the brush holder 9 and flows toward the brush holder 9 bypasses the brush holder 9 and flows down by the groove 15 provided in the wall portion facing the input shaft 1 in the axial direction.

Therefore, it is possible to eliminate the flow of the lubricating oil that reaches the contact portion between the brush 8 and the slip ring 7 through the insertion hole 11 of the brush 8, and to maintain the contact state between the brush 8 and the slip ring 7 satisfactorily. The operation of the electromagnetic powder clutch can be reliably performed.

[0011]

According to the rib structure of the transmission housing of the present invention, the lubricating oil can be prevented from flowing to the brush holder side and entering the contact portion between the brush and the slip ring. This has the advantage that defects can be prevented and the electromagnetic clutch can be reliably operated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rib structure of a transmission housing according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 2;

FIG. 3 is a sectional view of the electromagnetic powder clutch.

FIG. 4 is a cross-sectional view of a conventional transmission housing rib structure.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input shaft 7 Slip ring 8 Brush 9 Brush holder 10 Transmission housing 10a Annular part 10b Radial part 12, 13 Radial rib

Claims (1)

(57) [Scope of request for utility model registration] 1. A transmission housing rib structure including an annular portion surrounding an input shaft of an electromagnetic clutch together with a slip ring on which a brush for energizing the electromagnetic clutch abuts, and a radial portion extending outward from the annular portion. The radial ribs disposed above the brush holder holding the brush are formed oblique to the radial direction so that the lubricating oil flowing down from the upper side of the transmission housing flows to the opposite side of the brush holder. The rib structure of the transmission housing.