JPH024256Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a magnetic particle type electromagnetic clutch used in vehicles such as automobiles. More specifically, the present invention relates to a magnetic particle type electromagnetic clutch that prevents foreign matter from entering inside.

[Prior art]

In vehicles such as automobiles, it is known to provide a magnetic particle type electromagnetic clutch in order to transmit engine rotation to the transmission side (for example,
(Special Application No. 106445/1983).

This type of magnetic particle type electromagnetic clutch consists of a cylindrical driving member that is rotated around the centerline, a cylindrical hub part that connects to the driven shaft in the center, and a cylindrical hub part that is located inside the driving member and is concentric with the driven shaft. The driving member includes a driven member having a rotor that is provided to be relatively rotatable, and labyrinth members that are respectively attached to both ends of the driving member and form an annular space for accommodating magnetic particles. A cylindrical bearing holding part extending from the inner peripheral part of the rotor is provided at a radially outer position, and the inner peripheral part of one of the labyrinth members is connected to this bearing holding part through the bearing. The rotating force of the driving member is transmitted to the driven member by magnetically coupling the magnetic particles in the gap between the inner circumferential surface of the driving member and the outer circumferential surface of the rotor.

By the way, in the magnetic particle type electromagnetic clutch described above, the outer circumferential part of the cylindrical hub part connected to the driven shaft, and the outer circumferential part of the cylindrical bearing holding part extending from the inner circumferential part of the rotor. There is a gap between them, and through this gap, foreign matter such as muddy water may enter the annular space in which the magnetic particles are accommodated from outside the clutch.

Therefore, the cylindrical bearing holding part is positioned as close to the cylindrical hub part as possible, and the gap therebetween is made small to prevent foreign matter from entering.

However, the axial center on the engine side and the axial center on the transmission side are generally separated to a certain extent (about 0.4 mm).
Since the bearings are assembled with a permissible axis misalignment tolerance, a gap larger than the permissible tolerance inevitably exists between the cylindrical hub portion and the cylindrical bearing holding portion.

Therefore, foreign matter such as muddy water may enter through this gap into the annular space where the magnetic particles are accommodated, and this foreign matter such as muddy water deteriorates the magnetic particles, reducing the power transmission performance of the magnetic particle type electromagnetic clutch. I was afraid.

[Purpose of invention]

Therefore, the purpose of the present invention is to prevent foreign matter from entering the inside of the magnetic particle type electromagnetic clutch by preventing foreign matter from entering the gap between the cylindrical hub portion and the cylindrical bearing holding portion. The objective is to prevent the deterioration of power transmission performance.

[Structure of the idea]

In order to achieve this purpose, in the magnetic particle type electromagnetic clutch of the present invention, in the above-mentioned type of magnetic particle type electromagnetic clutch, the driven shaft has a small diameter part that fits into the hub part and a large diameter part adjacent to this small diameter part. A flange for preventing foreign matter intrusion is disposed at the tip of the cylindrical bearing holding part in the foreign matter intrusion direction toward the small diameter part of the driven shaft, and a bearing holding plate means that rotates together with the driving member is provided. It has a flange that covers the foreign matter intrusion prevention flange and extends toward the large diameter portion of the driven shaft, and the space surrounded by the bearing holding plate means, the foreign matter intrusion prevention flange, and the driven shaft. A discharge hole communicating with the outside is formed in the bearing presser plate means, and this discharge hole is located radially outward of the foreign matter intrusion prevention flange.

In the present invention configured as described above, the intrusion of foreign matter such as muddy water is first prevented by the bearing pressing plate means. The muddy water and the like adhering to the bearing retaining plate means are discharged radially outward by the centrifugal force accompanying the rotation of the bearing retaining plate means.

Next, if muddy water etc. enters through the gap between the bearing holding plate means and the large diameter part of the driven shaft,
The muddy water hits the flange to prevent foreign matter from entering. The muddy water adhering to the foreign matter intrusion prevention flange is scattered outward in the radial direction by the centrifugal force accompanying the rotation of the foreign matter intrusion prevention flange. A part of this scattered mud water is directly discharged to the outside from the discharge hole, but other mud water adheres to the inner wall of the bearing retainer plate means and is affected by the centrifugal force caused by the rotation of the bearing retainer plate means. It reaches the discharge hole and is discharged.

In addition, if muddy water, etc. that has invaded adheres to the driven shaft, the muddy water, etc. will rise from the small diameter section to the large diameter section due to the action of centrifugal force accompanying the rotation of the driven shaft.
It will be scattered. When this scattered muddy water or the like adheres to the inner wall of the bearing presser plate means, it reaches the discharge hole and is discharged by the action of centrifugal force accompanying the rotation of the bearing presser plate means.

In this way, the space communicating with the discharge hole is formed by the rotating bearing holding plate means, the flange for preventing foreign matter from entering, and the driven shaft having a step, so muddy water is discharged by the action of centrifugal force. It will be guided through the holes and effectively drained to the outside.

[Effect of idea]

In the present invention, as described above, foreign matter such as muddy water is prevented from entering into the inside of the magnetic particle type electromagnetic clutch by the bearing holding plate means, the foreign matter intrusion prevention flange, and the driven shaft. Foreign matter is discharged to the outside through the discharge hole, and foreign matter is reliably prevented from entering the annular space in which the magnetic particles are accommodated, thereby preventing deterioration of the magnetic particles and, as a result, reducing the power transmission performance of the magnetic particle type electromagnetic clutch. can be prevented.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 to 5 show a first embodiment of the present invention.

Figure 1 is a sectional view showing the entire magnetic particle electromagnetic clutch, Figure 2 is a half-cut side view of Figure 1 seen from the right,
Fig. 3 is an enlarged sectional view of the main part, Figs. 4 and 5 show a single bearing holding plate, and Fig.
The figure shows a front view, and FIG. 5 shows a sectional view taken along the line -- in FIG. 4.

The magnetic particle type electromagnetic clutch shown in Fig. 1 is applied to an automobile, and is built into a clutch housing fixed to an engine (not shown), and is connected to the engine's crankshaft as a drive shaft (input shaft). 10 rotation to the output shaft 12, which is the driven shaft, or to cut it off. The output shaft 12 serves as the input shaft of the transmission.

A bottomed cylindrical flywheel 14 is fixed to the end of the crankshaft 10, and a first yoke member 1 is attached to the inner surface of the outer peripheral part of the flywheel 14.
6 and a second yoke member 18, a yoke 20 serving as a driving member is fixed. York 20
has a thick-walled cylindrical shape, and is equipped with an excitation coil 22 inside and an inner circumferential friction surface 24 on the inner circumferential surface. Furthermore, a front labyrinth member 26 and a rear labyrinth member 28 are fixed to the yoke 20, and the rear labyrinth member 28 is integrally provided with a cylindrical bearing case 30 on its inner circumference.

The rotor 34 is provided inside the yoke 20 concentrically and rotatably relative to the yoke 20, and the outer circumferential friction surface 38 of the rotor 34 faces the inner circumferential friction surface 24 with a small gap 40 in between. and,
A substantially closed annular space 4 is formed by the yoke 20, both labyrinth members 26 and 28, and the rotor 34.
2 is formed, and a predetermined amount of magnetic powder 44 is enclosed in this annular space 42. The front labyrinth member 26 and the rear labyrinth member 28 have annular protrusions 46 and 4 that are very close to the rotor 34.
8, and its proximity prevents the magnetic particles 44 from leaking out of the annular space 42.

The rotor 34 is an annular member, and two plates 50 and 52 are fixed to the inside thereof by bolts. The elastic member 54 is held. On the other hand, a clutch hub 56 is attached to the end of the output shaft 12 by spline connection so as to be able to slide in the axial direction and not be able to rotate relative to the shaft.

The clutch hub 56 includes a cylindrical hub portion 58 into which the end of the output shaft 12 is fitted, and a disk portion 60 projecting in the form of a flange in the radial direction from an intermediate portion of the outer peripheral surface of the hub portion 58. A section 60 is disposed between the two plates 50 and 52 and is connected to the rotor 34 via an elastic member 54. The rotation of the rotor 34 is transmitted to the clutch hub 56 via the plates 50 and 52 and the elastic member 54, and the clutch hub 56, the plates 50, 52, and the rotor 34 constitute a driven member.

At a radially outward position of the circular tubular hub part 58 at a rear position (to the right in FIG. 1), this hub part 5 is located.
8 and the bearing holding part 36 with a slight gap.
is installed. The bearing holding portion 36 is integrally formed extending from the inner peripheral portion of the rotor 34, and has a cylindrical shape. The bearing case 30 on the inner peripheral portion of the rear labyrinth member 28 described above is rotatably supported by the bearing holding portion 36 via a ball bearing 32.

A pump drive rod 62, one end of which is connected to the crankshaft 10, is inserted into the output shaft 12 so as to be relatively rotatable. and output shaft 12
An oil seal 66 is fitted into the open end from which the rod 62 protrudes, allowing relative rotation between the output shaft 12 and the rod 62 while preventing leakage of lubricating oil between the two. There is.

A slip ring 68 is fixed to the outer peripheral surface of the bearing holding plate 90 that is attached to the bearing case 30 with screws or the like, and this slip ring 68 slides into contact with a brush (not shown) to prevent the conductive member 70 and Current is supplied to the excitation coil 22 via the conducting wire 72.

In the magnetic particle type electromagnetic clutch configured as described above, when an excitation current is supplied to the excitation coil 22, the magnetic particles 44 are generated in the gap 40 between the inner peripheral friction surface 24 of the yoke 20 and the outer peripheral friction surface 38 of the rotor 34. The rotation of the yoke 20 is transmitted to the rotor 34 by its magnetic coupling force and frictional force, and the output shaft 12 is further rotated via the clutch hub 56.

Next, the structure of the first embodiment, which is a feature of the present invention, will be explained with reference to FIGS. 3 to 5.

As shown in FIG. 3, the outer shape of the output shaft 12 as a driven shaft is stepped near the right end of the bearing holding part 36, with the right part being the large diameter part 12a and the left part being the large diameter part 12a. This portion is a small diameter portion 12b. A flange 80 for preventing foreign matter from entering is integrally provided from the right end of the bearing holding portion 36 toward the small diameter portion 12b on the left side.
The right end portion of the bearing holding portion 36 is the tip in the direction of foreign matter intrusion, and the foreign matter intrusion prevention flange 80 is designed to prevent foreign matter from entering from the direction of arrow a by connecting the cylindrical hub portion 58 and the cylindrical hub portion 58. This arrangement is ideal for blocking the intrusion into the gap between the bearing holding part 36 and the bearing holding part 36. Therefore, this foreign matter intrusion prevention flange 80 prevents foreign matter from entering.

A bearing holding plate 90 disposed at a radially outward position on the outside (on the right side in FIG. 3) of the foreign matter intrusion prevention flange 80 has a discharge hole 91 that communicates with the outside.
is provided with a flange 80 for preventing foreign matter from entering.
The foreign matter blocked by the rotary centrifugal force is discharged to the outside through the discharge hole 91.

Further, as seen in FIG. 3, an auxiliary flange 92 for preventing foreign matter from entering is integrally formed on the right side of the bearing holding plate 90. The foreign matter intrusion prevention auxiliary flange 92 is disposed toward the large diameter portion 12a of the output shaft 12, and prevents the foreign matter from entering as shown in the direction of arrow b before reaching the foreign matter intrusion prevention flange 80. This is prevented by an auxiliary blocking flange 92.

Further, as seen in FIG. 3, another flange 93 is integrally formed on the left side of the bearing holding plate 90. This flange 93 serves to prevent the foreign matter blocked by the foreign matter intrusion prevention flange 80 from entering toward the ball bearing 32 when the foreign matter is discharged through the discharge hole 91 due to centrifugal force.

The bearing press plate 90, as shown in FIGS. 4 and 5, is circular and has a cylindrical portion 90a. The aforementioned auxiliary flange 92 and flange 93 for preventing intrusion of foreign matter are provided in the inner tube portion of this cylindrical portion 90a.

Next, the operation of the first embodiment described above will be explained.

As shown in FIG. 3, while the vehicle is running, foreign matter such as muddy water tends to enter the inside of the magnetic particle type electromagnetic clutch from the directions of arrows a and b. At this time, the foreign matter that enters in the direction of the arrow b hits the foreign matter intrusion prevention auxiliary flange 92 and is prevented from further intrusion.

However, the foreign matter that enters in the direction of arrow a enters through the gap between the foreign matter intrusion prevention auxiliary flange 92 and the large diameter portion 12a of the output shaft 12, but this foreign matter also hits the foreign matter intrusion prevention flange 80. Further intrusion is prevented.

The foreign matter blocked by the foreign matter intrusion prevention flange 80 is blown outward in the radial direction by the rotational centrifugal force and is discharged to the outside through the discharge hole 91.

In this way, the auxiliary flange 92 for preventing foreign matter intrusion and the flange 80 for preventing foreign matter intrusion,
Since the intrusion of foreign matter into the inside of the magnetic particle type electromagnetic clutch is reliably prevented, foreign matter does not enter into the annular space 42 where the magnetic particle 44 is accommodated, and as a result, deterioration of the magnetic particle 44 can be prevented and the power Deterioration in transmission performance can be prevented.

FIG. 6 shows a second embodiment of the invention. In addition,
This FIG. 6 is illustrated in comparison with FIG. 3 in the first embodiment described above.

The second embodiment is basically the same as the first embodiment described above, but has a foreign matter intrusion prevention flange 80.
A water- and oil-absorbing material 85 such as felt or asbestos is attached between the auxiliary flange 92 and the auxiliary flange 92 for preventing foreign matter from entering. In this second embodiment, the auxiliary flange 92 for preventing foreign matter from entering is integrally formed with the slip ring holding portion 87.

In this second embodiment, with the above-described configuration, muddy water that enters through the gap between the foreign matter intrusion prevention auxiliary flange 92 and the large diameter portion 12a of the output shaft 12 is prevented.
Water is absorbed by the water- and oil-absorbing substance 85 and discharged to the outside through the discharge hole 91 due to centrifugal force. In this way, the muddy water is absorbed by the water- and oil-absorbing substance 85, so that the discharge action is reliably performed without scattering. Note that the same procedure is performed when the foreign object is oil or the like. In addition, if the foreign substance is solid, centrifugal force may cause the inclined surface 8 of the substance 85 to
5a.

Although the present invention has been described above with reference to specific embodiments illustrated, the present invention is not limited to these embodiments, and various other embodiments are possible within the scope of the present invention.

For example, in each of the embodiments described above, the foreign matter intrusion prevention flange 80 is a cylindrical bearing holding portion 36.
Although the description has been given of a case in which it is formed integrally with the body, it may be formed separately. Similarly, the auxiliary flange 92 for preventing intrusion of foreign matter may also be a separate body.

[Brief explanation of the drawing]

Figures 1 to 5 show a first embodiment of the present invention, Figure 1 is a sectional view showing the entire magnetic particle type electromagnetic clutch, and Figure 2 is a half-cut side view of Figure 1 viewed from the right. , FIG. 3 is an enlarged cross-sectional view of the main parts, FIG. 4 is a front view showing a single bearing holding plate, FIG. FIG. 2 is an enlarged sectional view of a main part showing a second embodiment. Explanation of symbols, 12... Output shaft (driven shaft), 2
0...Yoke (driving member), 24...Inner peripheral friction surface (inner peripheral surface), 26...Front labyrinth member, 2
8... Rear labyrinth member (one labyrinth member), 32... Ball bearing (bearing),
34... Rotor (driven member), 36... Bearing holding part, 38... Outer peripheral friction surface (outer peripheral surface), 4
0... Gap, 42... Annular space, 44... Magnetic powder, 58... Cylindrical hub portion (driven member), 8
0... Flange for preventing foreign matter intrusion, 91... Discharge hole.

Claims (1)

[Claims for Utility Model Registration] A cylindrical driving member that is rotated around a center line, a cylindrical hub portion that is connected to a driven shaft in the center, and that is located inside the driving member and is concentric therewith. a driven member having a rotor provided to be relatively rotatable; and labyrinth members each attached to both ends of the driving member to form an annular space for accommodating magnetic particles; A regenerated cylindrical bearing holding part extending from the inner peripheral part of the rotor is provided at a position outward in the direction, and the inner peripheral part of one of the labyrinth members is held in this bearing holding part through the bearing. In a magnetic particle electromagnetic clutch of a type that transmits the rotational force of a driving member to a driven member by magnetically coupling magnetic particles in a gap between the inner circumferential surface of the driving member and the outer circumferential surface of the rotor. , the driven shaft includes a small diameter portion that fits into the hub portion and a large diameter portion adjacent to the small diameter portion, and a foreign matter intrusion prevention flange is covered with a tip portion of the cylindrical bearing holding portion in a foreign matter intrusion direction. The bearing holding plate means, which is disposed toward the small diameter portion of the drive shaft and rotates together with the drive member, covers the foreign matter intrusion prevention flange and has a flange extending toward the large diameter portion of the driven shaft. A discharge hole is formed in the bearing retainer plate means to communicate the space surrounded by the bearing retainer plate means, the flange for preventing foreign matter from entering, and the driven shaft to the outside, and this discharge hole is used to prevent foreign matter from entering. A magnetic particle type electromagnetic clutch characterized by being located outside the radius of the flange.