JPS5939222Y2 - Wet multi-plate brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wet multi-disc brake, for example, a wet multi-disc brake provided between an axle housing and a wheel boss of a vehicle.

As this type of wet multi-disc brake, the one shown in FIG. 1 is known (see Japanese Patent Laid-Open No. 124132/1983).

The brake includes a housing portion 74 fixed to the axle housing, a housing portion 74 rotatably mounted to the axle housing and disposed within the housing portion 74, and a spline 9.
4 is formed, a plurality of second discs (inner discs) 108 are fitted into the splines 94 of the wheel hub 36, and a plurality of second discs (inner discs) 108 are mounted within the housing portion 74 and disposed between the second discs 108. First disc (outer disc)
110.

In such a brake, it is often necessary to remove the wheel hub 36 from the second disc 108 for disassembly and to fit it back into the disc 108 for assembly.

However, once the wheel hub 36 is removed, the second disc 10
8 is freely displaced within the housing part 74, which makes it very difficult to fit the splines 94 of the wheel hub 36 into the disc 108 again.

In order to avoid this, the second disc 108 is positioned in advance and the wheel hub 36 is inserted with the discs 108 and 110 pressurized and fixed, but in this case as well, There is a problem of inefficiency.

For this reason, in the brake shown in FIG.
By making the gap between the outer end surface of the second disk 108 and the inner circumferential surface 122 of the housing portion 74 as small as possible, displacement of the second disk 108 in the radial direction is suppressed.

However, in this case, the shape of the second disc 108 is complicated, the inner circumferential surface of the housing portion 74 needs to be precisely machined, and displacement of the second disc 108 in the circumferential direction cannot be suppressed. There are drawbacks.

This invention was made in view of the above-mentioned circumstances, and provides a wet multi-disc brake that is easy to disassemble and assemble, and has a simple structure.

This invention will be explained in detail below with reference to embodiments shown in FIGS. 2 and 3.

The drawing shows a wet multi-disc brake for wheels in an unused state, such as immediately after assembly, in which a spindle 3 and an end plate 4 with a cylinder are fixed to the end of an axle housing 2 equipped with an axle 1. A shell 5 is fixed to the outer periphery of.

O-rings 6.7 are installed between the spindle 3 and the end plate 4, and between the end plate 4 and the shell 5, of which the end plate 4 and the shell 5 constitute a brake housing.

An oil passage 8 is formed on the outer surface of the end plate 4, and cylinders 9 that are supplied with oil from the oil passage 8 are formed at six locations on the inner surface.
Three penetrating positioning pin attachment holes 10 are provided.

A mounting body 1 for a planetary gear device (not shown) is attached to the spindle 3.
A wheel boss (rotating shaft) 15 is rotatably supported by the boss 12 and spindle 3 via bearings 13 and 14.

The flange 16 of the wheel boss 15 has a disc portion 1 of the wheel 17.
8 is attached between the wheel boss 15 and the shell 5,
A floating seal 19 is provided.

The end of the wheel boss 15 (end of the rotating shaft) is located in the fluke housing, and the spline 20 is formed in this part.The spline 20 of the three-wheel boss 15 has a plurality of inner discs 21 attached to the shaft. Each inner disk 21 has three positioning pin insertion holes 22 that penetrate through all the inner disks 21 and correspond to each of the pin attachment holes 10. It is being

One outer disk 23 is arranged between the inner disks 21 at a portion closer to the outer periphery than the pin insertion hole 22, and each of these outer disks 23 has a plurality of convex portions 24 formed on the outer periphery of the shell 5. By fitting into a recess 25 formed on the inner peripheral surface, it is attached to the shell 5 so as to be movable only in the axial direction.

A piston 27 with a pressure plate 26 attached to its tip is slidably fitted into the cylinder 9 on the end plate 4, and the pressure plate 26 is connected to a fixed plate 28 provided on the inner surface of the shell 5.
All the inner disks 21 and outer disks 23 are sandwiched between them.

Further, a compression spring 29 is installed between the pressure plate 26 and the fixed plate 28 to bias them in a direction away from each other.

Then, a positioning pin 30 is inserted into each pin mounting hole 10 of the end plate 4.
is screwed, and its tip is attached to all inner discs 2.
It passes through the pin insertion hole 22 of No. 1.

The tip of this positioning pin 30 is formed into a tapered shape, and the step of this tapered portion is larger than the amount of displacement in the radial direction and circumferential direction of the inner disk 21 due to play between the wheel boss 15 and the inner disk 21. It's being made big.

In the above, during normal vehicle use, the positioning pin 3
0, and screw a plug with an O-ring (not shown) into the pin mounting hole 10.

Others are the same as conventional brakes.

When disassembling this brake, before removing the wheel boss 15, remove the above-mentioned plug and screw the positioning pin 30 into the pin attachment hole 10 as shown in the figure.

This operation is performed as follows.

That is, after removing the plug, insert the positioning pin 30 into the pin attachment hole 10, and while pressing the tip of the pin against the inner disk 21 located closest to the end plate 4, gently rotate the wheel boss 15, that is, the inner disk 21, and remove the pin. When aligned with the insertion holes 22, the positioning pins 30 are inserted through them and screwed into the pin attachment holes 10.

In this state, the wheel boss 15 is attached to the inner disc 2.
Remove from 1.

Even if the wheel boss 15 is removed, the inner disk 21 is not displaced because the positioning pin 30 positions and holds the inner disk 21.

When assembling the brake again, with the positioning pin 30 screwed into the pin attachment hole 10 in this manner, the splines 20 of the wheel boss 15 are aligned with the splines of the inner disc 21 and fitted therein.

At this time, since the inner disk 21 is fixed by the positioning pin 30, the wheel boss 15 can be fitted very easily.

Note that even in the case of assembly at the time of manufacturing rather than reassembly, the inner disk 21 is similarly fixed by the positioning pin 30 and the wheel boss 15 is fitted.

In the above embodiment, holes 31 and 32 are drilled in the wheel boss 15 to allow the lubricating oil of the planetary gear set to circulate inside the brake housing, but the pin mounting hole 10, which is unnecessary when the vehicle is in use, is provided. Using disk 21.
23, that is, as shown in FIG. The lubricating oil of the planetary gear set and the lubricating oil of the disk 21.23 are separated by the O-ring 34 attached to the 0-ring 34, and the oil is supplied from the upper pin mounting hole 10 and discharged from the lower pin mounting hole 10. This allows forced lubrication of the disks 21,23.

In FIG. 4, the same parts as in FIG. 3 are given the same reference numerals.

The number of pin attachment holes 10 is not limited to three, but may be two or more.

As described above, the wet multi-disc brake according to this invention includes a fixed brake housing provided with a plurality of positioning pin mounting holes, and a brake housing disposed within the brake housing.
and a rotary shaft end on which a spline is formed, and a plurality of positioning pin insertion holes that are fitted into the splines of the rotary shaft end and that correspond to each of the positioning pin attachment holes, and that are provided so as to penetrate through the entire body. an inner disc, a plurality of outer discs installed in the brake housing and arranged nearer to the outer periphery than the positioning pin insertion hole between the inner discs; Since it is equipped with a positioning pin that is attached to the brake housing, the structure is simple and economical, and its disassembly and assembly are extremely easy.

Further, the locating pin attachment hole, which is unnecessary when the brake is used, can be used to lubricate the disc.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing a conventional example, Fig. 2 is a partially cutaway front view showing an embodiment of this invention, and Fig. 3 is Fig. 2 I-
FIG. 4, a sectional view taken along line III, shows another embodiment of this invention, and corresponds to a part of FIG. 3. 4... End plate, 5... Shell, 10...
...Positioning pin mounting hole, 15...Wheel boss (rotating shaft), 20...Spline, 21...
... Inner disk, 22 ... Positioning pin insertion hole, 23 ... Outer disk, 30 ...
····Positioning pin.

Claims (1)

[Scope of utility model registration request] a fixed brake housing provided with a plurality of positioning pin mounting holes; a rotary shaft end disposed within the brake housing and formed with a spline; Each of the positioning pin mounting holes (a plurality of inner disks provided with a plurality of positioning pin insertion holes having a width of two pairs and penetrating the entirety thereof,
It is installed in the brake housing so as to pass through a plurality of outer discs that are located closer to the outer periphery than the positioning pin insertion holes between the inner discs, and all of the inner discs. A wet multi-disc brake equipped with a locating pin.