JPS6128120Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a multi-disc brake device, and more specifically, a multi-disc brake device for a transmission that incorporates a plate and a disk from the piston side and receives the thrust force of a ring gear by a snap spring. Regarding brake equipment.

The ring gear of a transmission using a Lavigne type planetary gear is in helical gear engagement with a pinion. Therefore, thrust force is generated in the ring gear due to the rotation of the ring gear and pinion. This thrust force acts in the direction of operating the multi-disc brake arranged around the outer periphery of the ring gear, causing the brake to drag, causing the multi-disc brake to perform a braking action when no braking force is required, resulting in unexpected and undesirable effects. You will get the output. or,
In conventional multi-disc brake devices, the plate and disk were assembled from the side opposite to the piston, but this assembly was not easy due to restrictions on surrounding members.

This idea was developed focusing on the above-mentioned points, and the spline groove of the case that holds the disk opens toward the piston side, and the snap ring is installed through the opening so as to be perpendicular to the spline groove. The object of the present invention is to provide a multi-disc brake device in which a snap spring receives the thrust force of a ring gear so as not to have any adverse effect on plates and discs.

An embodiment of this invention will be described with reference to the accompanying drawings.

FIG. 1 shows a part of the transmission 1. Reference numeral 2 denotes a first sun gear that is spline-engaged with a shaft 3, and the sun gear 2 meshes with a long pinion 4. As shown in FIG. The second sun gear 5 meshes with a short pinion 6 and is supported by an intermediate shaft 7. The short pinion 6 meshes with a ring gear 8, and the short pinion 6 and long pinion 4 are supported by a carrier 9. The carrier 9 is connected to an output shaft 10, and a multi-disc brake device 11 is arranged around the outer circumference of the ring gear 8.

The multi-disc brake device 11 has a plurality of spaced apart spline grooves 12 cut in the outer peripheral surface of the ring gear 8 in the axial direction thereof. This spline groove 12 is grooved from the piston 13 side and is open to the piston 13 side, so that the groove cutting operation is easy. The protrusion of the disk 15 is inserted into the spline groove 12 through the opening 14.
The disk 15 is held by the ring gear 8. A case 16 is arranged at a distance from the outer circumference of the ring gear 8. A plurality of spaced apart spline grooves 17 are provided on the inner peripheral wall surface of the case 16. This spline groove 17 is grooved from the piston 13 side and has an opening 18 on the piston 13 side, making the groove cutting work easy. An annular groove 19 is provided at a suitable location of the spline groove 17 of the case 16 so as to be perpendicular to the spline groove 17, and a snap ring 20 is disposed in the annular groove 19. The spline grooves 17 of the case 16 are provided on the inner circumferential surface of the case 16 corresponding to the outer circumferential surface on which the spline grooves 12 of the ring gear 8 are provided, and are preferably opposed to each other.

As shown in FIG. 2, the protrusion of the thrust receiving plate 21 is inserted into the spline groove 17 through the opening 18 so that it is supported deep inside the spline groove 17 of the case 16. Next, Snut Spring 2
0 is placed in the annular groove 19. This Snut Spring 2
0, the outer circumference of the snap spring 20 and the thrust receiving plate 21 come into contact with each other, so that movement of the thrust receiving plate 21 in the right direction as viewed in FIG. 2 is restricted. Next, the disc 15 is held by the ring gear 8 while the protrusion is inserted into the spline groove 12 of the ring gear 8. Next, plate 22
is held in the case 16 by inserting its protrusion into the spline groove 17 of the case 16 through the opening 18. Sequentially, the disk 15 and plate 22 are alternately held by the ring gear 8 and the case 16 by the method described above. This operation is extremely easy because it is performed through the openings 14 and 18 that are open to the piston 13 side.

Multi-disc brake device 11 configured in this way
Even if a thrust force is applied to the ring gear 8 in the direction of the arrow in FIG. Does not have any negative impact. In this way, the multi-disc brake device 11 always performs its predetermined function.

As is clear from the above, in this invention, the spline grooves of the ring gear and case are cut from the piston side and opened on the piston side, making it easy to install the disk and plate. Since the movement of the thrust receiving plate is restricted and the thrust force generated in the ring gear is not transmitted to the disk, there is no unexpected braking action.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of the transmission, FIG. 2 is a partial sectional view of the multi-disc brake device, and FIG. 3 is a partial side view of the multi-disc brake device. In the diagram: 8...Ring gear, 11...Multi-disc brake device, 12, 17...Spline groove, 15...
Disc, 16... Case, 19... Annular groove, 2
0...Snat spring, 21...Thrust receiving plate, 22...Plate.

Claims (1)

[Scope of utility model registration request] A multi-disc brake device for a transmission, in which a plurality of discs held by a ring gear and a plurality of plates held by a case are arranged alternately, and the plates and the discs are brought into pressure contact with each other by the operation of a piston. The spline groove of the holding case is open to the piston side, and the case is provided with an annular groove orthogonal to the spline groove, so that a snap ring disposed in the annular groove receives thrust force of the ring gear. A multi-disc brake device for a transmission, characterized by: