JPH0428224Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to the structure of a retarder rotor of an electromagnetic retarder, which is a deceleration brake for a vehicle, and particularly relates to the structure of a retarder rotor that improves the braking efficiency of the retarder. be.

2. Description of the Related Art Electromagnetic retarders are designed to provide a deceleration brake to the flywheel by generating electric power from the magnetic field generated by the rotation of the flywheel of an engine, converting it into heat, etc. and consuming it. One of the prior art techniques is disclosed in Utility Model Application No. 161650/1983. That is, as shown in FIG. 6, a magnetic tooth 1 is fixed by bolts 3 to a flywheel 2 connected to a crankshaft 12 of an engine, and a ring gear 13 is also fixed to the flywheel 2. The magnetic teeth 1 have teeth 4 on the outer periphery as shown in FIG.
The inner circumferential surface 7 of the clutch disc 8 is disposed to surround and cover the outer periphery of the clutch disc 8. Note that an appropriate number of through holes 14 are formed in the bottom surface 6 of the magnetic teeth 1 so as to penetrate through the inner circumferential surface 7. The magnetic teeth 1 fixed to the flywheel 2 form the retarder rotor,
The magnetic teeth 1 are formed from a magnetic material.

The retarder unit 15 includes an iron core 16 disposed on the outer circumferential side of the magnetic teeth facing the magnetic teeth, an excitation coil 17 , a coil winding frame 18 around which the excitation coil 17 is wound, a short-circuit ring 19 fitted onto the iron core 16 , and the like. The iron core 16 is fixed to a flywheel housing 20 that covers the flywheel 2 and the like.

A clutch cover 22 that holds a back plate 21 and the like of the clutch disk 8 is fixed to the magnetic teeth 1 with bolts 3.

With the above structure, when the flywheel 2 rotates, a current is generated due to changes in the lines of magnetic force between the magnetic teeth 1 and the iron core 16, and this current circulates through the short circuit ring 19 and is converted into thermal energy. magnetic teeth 1
Since there remains a magnetic force that tends to maintain the configuration of the magnetic circuit even when the magnetic teeth 1 move away from the iron core 16, an attractive force is generated between the magnetic teeth 1 and the iron core 16, and this acts on the flywheel 2 as a braking force.

As described above, the retarder applies a braking force, but since the magnetic teeth cover the clutch disc 8 as described above, the friction powder of the clutch disc 8 is not discharged to the outside. For this reason, in the prior art, the through hole 14 was provided as described above to prevent this.

Problems to be Solved by the Invention The braking force by the retarder is influenced by the surface area of the magnetic teeth 1, which are the retarder rotor, on the retarder unit 15 side (the side facing the iron core 16). Therefore, as in the prior art, the magnetic teeth 1
If the through hole 14 is provided in the through hole 14, a disadvantage arises in that the magnetic field area becomes smaller by this amount.

The object of the present invention is to provide a retarder rotor structure which can solve the above-mentioned drawbacks, and can effectively discharge friction powder from the clutch disk and dissipate clutch friction heat.

Means for Solving the Problems For this purpose, the present invention provides a groove passage that opens toward the outer circumference from the clutch disk contact surface in the magnetic teeth mounting portion of the flywheel, and also provides a groove passage that opens toward the outer periphery from the clutch disk contact surface, and a The retarder rotor has a structure in which a chamfered portion is formed at the corner portion of the tooth, which opens toward the outer circumferential side of the clutch disk and does not open toward the retarder unit.

Operation: Frictional powder from the clutch disk is discharged from the groove passage and chamfered portion, and frictional heat from the clutch is also dissipated from these. Furthermore, since the chamfered portion does not open toward the retarder, the magnetic field area does not decrease, and the desired braking force can be obtained.

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

As shown in FIG. 1, the magnetic teeth 1 are connected to the bolts 3
It is fixed to the flywheel 2 by. As shown in FIG. 2, the magnetic tooth 1 has teeth 4 formed at appropriate intervals on its outer periphery, and the top surface 5 and bottom surface 6 of the teeth 4 are connected to the iron core 16 of the retarder unit 15 (FIG. 6).
will be placed towards. Further, the inner circumferential surface 7 of the magnetic teeth 1 is arranged to surround the outer circumference of the clutch disk 8.

A chamfered portion 9 is formed at a corner portion of the magnetic tooth 1 that is fixed to the flywheel 2. In this embodiment, a suitable number of chamfered portions 9 are formed at positions facing the tooth bottom surface 6. The chamfered portion 9 is formed to open toward the clutch disk 8 side and toward the mounting surface of the flywheel 2, and opens at a position separated from the tooth bottom surface 6 by a distance 1, as shown in FIG. That is, the chamfered portion 9 is chamfered without opening on the tooth bottom surface 6 side.

On the other hand, as shown in Fig. 3, the flywheel 2
A groove passage 10 is formed in the corner portion to which the magnetic tooth 1 is attached. The groove passage 10 has magnetic teeth 1
A suitable number of clutches are formed at positions facing the chamfered portions of the clutch disk 8, with one side open toward the clutch disk 8 and the other side open toward the outside of the flywheel 2. Further, the groove passage 10 has a width b commensurate with the chamfered portion 9, and its bottom surface 11 is formed into a relatively smooth arc shape.

Next, the operation of this embodiment will be explained. As shown in FIG. It flows as shown by arrow A and is discharged to the outer circumferential side of the flywheel 2. Therefore, friction powder can be sufficiently discharged even without the through hole 14 as in the prior art. Furthermore, the frictional heat of the clutch is effectively dissipated by the chamfered portion 9 and the groove passage 10.

On the other hand, as described above, the chamfered portion 9 is formed by the magnetic teeth 1.
Since there is no opening on the tooth top surface 5 and tooth bottom surface 6 side,
It becomes possible to apply sufficient deceleration braking force to the flywheel 2 without reducing the magnetic field area.

FIG. 5 shows another embodiment of the groove passage 10A formed in the flywheel 2. As shown in FIG.

As shown in the figure, the groove passage 10A is connected to the flywheel 2.
It is formed to be inclined in a direction opposite to the rotation direction (shown by arrow B). Note that the formation position and the like are the same as in the previous embodiment. By slanting the groove passage 10A, it becomes possible to discharge friction powder and dissipate frictional heat more quickly.

The groove passages 10 and 10A are not limited to those in the embodiment described above, and may be formed to widen toward the outer periphery of the flywheel 2, for example. Further, the chamfered portion 9 may be formed not only at a position facing the tooth bottom surface 6 but also at a position facing the tooth portion 4. Further, the inclined surface 9A of the chamfered portion 5 may be formed in an arc shape.

Effects of the Invention As is clear from the above explanation, according to the present invention, the retarder rotor improves the deceleration braking force and can effectively discharge and dissipate clutch friction powder and clutch friction heat.

[Brief explanation of drawings]

Fig. 1 is a partial axial sectional view of one embodiment of the present invention;
The figure is a view taken in the direction of the arrow in FIG. 1, FIG. 3 is a partial axial sectional view showing the groove passage of the embodiment, FIG. 4 is a plan view taken in the direction of the arrow in FIG. FIG. 6 is a plan view of an example, FIG. 6 is a sectional view of the area around a conventional retarder rotor, and FIG. 7 is a partial perspective view of a conventional magnetic tooth. 1...Magnetic teeth, 2...Flywheel,
3... Bolt, 4... Teeth, 5... Tooth tip surface, 6...
... Tooth bottom surface, 7 ... Inner peripheral surface, 8 ... Clutch disk, 9 ... Chamfered portion, 10, 10A ... Groove passage, 1
1...bottom, 12...crankshaft, 13...
... Ring gear, 14 ... Through hole, 15 ... Retarder unit, 16 ... Iron core, 17 ... Excitation coil, 18 ... Coil winding frame, 19 ... Short circuit ring, 20
...Flywheel housing, 21...Back plate, 22...Clutch cover.

Claims (1)

[Scope of utility model registration request] A magnetic tooth is fixed to the flywheel housing and is arranged opposite to a retarder unit formed from an excitation coil, an iron core, etc., and is fixed to the flywheel of the engine and is arranged around the outer periphery of the clutch disk so as to surround it. In the structure of the retarder rotor, a groove passage opening toward the outer periphery from the clutch disk contact surface is formed in the magnetic teeth mounting portion of the flywheel, and a corner portion of the magnetic teeth faces the groove passage. A structure of a retarder rotor, characterized in that a chamfered portion is formed in the clutch disk to open toward the outer circumferential side of the clutch disk and not to open toward the retarder unit.