JPH022101Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a multi-plate steering brake that uses a large number of friction plates, and is particularly constructed so that it can be easily disassembled and assembled.

[Prior art]

Conventionally, one of the drive wheels placed on the left and right sides of the vehicle was
A so-called steering brake, in which braking is performed by a multi-plate type brake and only the other plate is driven to change the direction of travel of the vehicle, is known. However, since the multi-plate steering brake has a large number of friction plates spline-engaged with the drive case or drive shaft, once it is disassembled, it is difficult to reassemble it.

[Summary of the idea]

In order to solve the above problems, this invention assembles the friction plates that engage the drive shaft through relatively fine splines, aligning them with alignment pins so that the splines of each friction plate are in the same phase. It has certain characteristics.

〔Example〕

This invention will be explained below with reference to the drawings. 1
is a tractor that runs on endless track 2,
The power from the engine 3 mounted at the front of the vehicle passes through a clutch 4 and a transmission 5, is branched off to left and right drive shafts 7, 7 by a gear system 6, and is transmitted to an axle 9 via a reduction gear train 8. be done. 11, 11 are steering brakes connected to the left and right drive shafts 7, 7;
2 is a transmission case.

A support shaft 14 of a large gear 13 driven by the engine 3 is rotatably supported within the transmission case 12, and a drive shaft 7 is connected to it via a steering clutch 15.
is supported. The drive shaft 7 drives the reduction gear train 8 via a drive gear 7a, and also has an involute spline 7b provided on its outer periphery.
It is connected to the steering brake 11. A brake arm 21 moves the drive shaft 7 left and right, presses the brake flange 7c, and operates the steering brake 11. 22 is a return spring that returns the drive shaft 7 to its original position when the pressure of the brake arm 21 is released.

The steering brake 11 is incorporated into a lid member 23 that is removably attached to a side opening of the transmission case 12. That is, between the several first friction plates 25 that are slidably engaged only in the axial direction by the outer protrusions 25a in the axial long grooves 24 formed on the outer periphery of the lid member 23; The second friction plates 26 arranged on the top and the second friction plates 26 are stacked alternately, and then the press plates 27 are stacked on top of each other, and are secured with clips 28. The second friction plate 26 is engaged with the involute spline 7b provided on the outer periphery of the drive shaft 7 by an involute spline formed on the inner periphery. In this way, the steering brake 11 is configured between the lid member 23 and the pressing plate 27.

Here, each second friction plate 26 has a through hole 26a, into which an alignment pin 29 is inserted. The through hole 26a is formed at a predetermined angle with the spline formed on the inner periphery of the second friction plate 26,
When the through holes 26a are coaxially aligned, the splines are aligned in the same phase. That is, in FIG. 5, the alignment pin 29 is configured as a straight rod-shaped spring pin formed by winding a steel plate into a cylindrical shape, and the spring pin is press-fitted into the pressing plate 27. Of course, the effect will not change if you replace the spring pin with a knock pin with a precisely finished outer periphery. Further, in FIG. 6, the pin is configured as a headed pin, and the large diameter head is held between the second friction plate 26 and the pressing plate 27 to prevent it from coming off.

Next, the operation of the brake deflection device of the embodiment will be explained.
When the vehicle is moving straight, the left and right steering clutches are engaged, as shown in the right half of FIG. When the steering wheel is operated from this state to turn the vehicle to the left, the brake arm 21 moves the drive shaft 7 to the left, the steering clutch 16 is disengaged, and the left axle 9 is released from the transmission system. . In addition, the steering brake 11 operates in conjunction with the braking operation at the same time. That is, when the intermediate gear 7 moves to the left, the pressing plate 27 is pressed by the brake flange 7b and moves toward the lid member 23, pinching the first friction plate 25 and the second friction plate 26, and pressing the intermediate gear 7. Stop the rotation of 7. Therefore, the transmission system for the left axle 9 is completely stopped, and only the transmission system for the right axle 9 is activated, turning the vehicle to the left.

Next, a method of assembling the steering brake 11 will be explained. First, as a preparatory step, the first friction plate 25 and the second friction plate 26 are aligned on the inner surface of the lid member 23 using the alignment pins 2.
9 and are assembled alternately, and finally the press plate 27 is assembled and the clips 28 are used to prevent the plates from coming off. In this state, the second friction plate 26 and the pressing plate 2
7. In the splines on the inner surface, grooves or grooves or peaks are aligned and the phases match.

In order to assemble the lid member 23 assembled in this way to the transmission case, insert the previously assembled steering brake into the side opening so that the protrusion on the inside of the pressing plate 27 or the second friction plate When it comes into contact with
By rotating it in the circumferential direction and finding a position where the inner spline of the pressing plate 27 or the second friction plate 26 and the outer circumferential spline 7b engage, the whole can be easily pushed into the transmission case and assembled. At this time, since the phases of the inner circumferential splines between the second friction plates 26 are matched with each other by the alignment pins 29, the phases of the inner circumferential splines 7b of the drive shaft 7 can be aligned for each second friction plate 26. Since there is no need to do
The joining operation can be performed extremely easily.

When it is necessary to disassemble the steering brake 11, it can be disassembled through the reverse process.

[Effect of idea]

As described above, this invention provides the drive shaft 7 in the transmission case 12 to transmit the power of the engine to the axle,
A side opening is provided in the transmission case 12 located outside the drive shaft 7, a lid member 23 is removably attached to the side opening, and a projection on the outer periphery is provided between the lid member 23 and the drive shaft 7. A first friction plate 25 that is movably engaged only in the axial direction with the drive shaft 7 and a second friction plate 26 that is spline-engaged with the drive shaft 7 are arranged alternately, and both friction plates are supported on the drive shaft 7. In the steering brake which is removably frictionally engaged with a plate 27, the second
A through hole 26a is provided in the friction plate 26, and the through hole 26a is provided in the friction plate 26.
The steering brake 11
Since it can be easily attached and detached from the transmission case 12 together with the cover member 23, maintenance such as assembly and replacement of friction plates is easy. In addition, disassembly and assembly of small parts that make up the steering brake, such as each friction plate and pressing plate, can be performed at a location away from the transmission case 12, and there are no restrictions on the work location or working posture, so assembly and maintenance can be performed on the transmission case. This has the advantage that the work can be done more easily than on the case 12.

[Brief explanation of drawings]

The drawings show one embodiment of this invention. Fig. 1 is a diagram of the drive system of the tractor, Fig. 2 is a sectional view of the main parts, Fig. 3 is a cross-sectional view thereof, Fig. 4 is an enlarged sectional view showing the main parts, with a part cut away, and Fig. 5 That's that-
6 is a sectional view corresponding to FIG. 5 showing another embodiment. 7... Drive shaft, 7b... Spline, 7c...
Braking flange, 11... Steering brake, 23...
Lid member, 25...first friction plate, 26...second friction plate, 27...pressing plate, 29...alignment pin.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The transmission case 12 is provided with a drive shaft 7 that transmits the power of the engine to the axle, and the transmission case 12 is provided with a side opening located outside the drive shaft 7; A first friction plate 25 is provided between the cover member 23 and the drive shaft 7 and is movably engaged with the cover member 23 only in the axial direction by a protrusion on the outer periphery. The second spline-engaged
In a steering brake in which friction plates 26 are arranged alternately and both friction plates are frictionally engaged with each other in a detachable manner by a pressing plate 27 supported on a drive shaft 7, the second friction plate 26 is provided with a through hole 26a. and the through hole 26a
An assembly structure of a steering brake in which an alignment pin 29 is inserted into and engaged so as to be movable only in the axial direction. (2) The alignment pin 29 is connected to the second friction plate 26 and the pressing plate 27
1. The steering brake assembly structure according to claim 1, which is a headed pin having a head held between. (3) The steering brake assembly structure according to claim 1, wherein the alignment pin 29 is a round bar-shaped spring pin press-fitted into the pressing plate 27.