JPH05126173A - Transmission structure for work vehicle - Google Patents

Abstract

PURPOSE:To improve a cooling effect on friction plates without reducing a braking function for a wet type brake. CONSTITUTION:A wet type multi-plate friction brake 13 is provided a an axle 12, and circular friction plates 15, 16 of this friction brake 13 are disposed between a circular pressure operation means 20 and a circular pressure brake 21. A circular space S is then formed on the outer side of the diameter of the friction plates 15, 16 to form a transmission structure for a work vehicle. An oil passage L connecting the circular space S and an oil storage space R on the inner side of the diameter of the friction plates 15, 16 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a wet multi-plate friction brake on an axle, and an annular friction plate of this friction brake is arranged between an annular pressing operation tool and an annular pressing plate. The present invention relates to a power transmission structure for a work vehicle in which an annular space is formed on the radially outer side of a friction plate.

[0002]

2. Description of the Related Art In the transmission structure of a work vehicle, conventionally, a case supporting portion for supporting the pressing operation tool and a case supporting portion for receiving and supporting the pressing plate have been formed annularly.

[0003]

The above-mentioned conventional structure is configured such that the pressing force for braking by the pressing operation tool acts over the entire circumference of the friction plate. Since the annular space formed by the support portion and the inner oil storage space are in communication with each other only through the gap between the friction plates, it is difficult for the cooling oil to enter the annular space, and the diameter of the friction plate is reduced. However, there is a drawback that it acts only on the inner side in the direction and does not exert a sufficient cooling effect on the outer side in the radial direction. The present invention aims to eliminate the above-mentioned problems.

[0004]

According to a characteristic construction of the present invention, in the power transmission structure for a working vehicle described at the beginning, an oil passage for communicating the annular space and an oil storage space on the radially inner side of the friction plate. Is formed.

[0005]

In order to obtain a sufficiently large braking force, the pressing operation tool and the pressing plate are formed in an annular shape, but the cooling oil is provided to the annular space formed on the outer side thereof through the oil passage. Is efficiently supplied, and the cooling effect of oil effectively acts on both the inner and outer ends of the friction plate.

[0006]

Therefore, with a simple structure improvement, the cooling effect on the friction plate can be improved without lowering the braking function.

[0007]

Embodiments will be described below with reference to the drawings. Figure 5
Shows the front loader work vehicle. This work vehicle
A front vehicle body 2 having a pair of left and right front wheels 1 and a rear vehicle body 4 having a pair of left and right rear wheels 3 are pivotally connected to each other about a vertical axis Y so as to be swingable relative to each other. On the basis of this, the steering cylinder 6 is configured to relatively swing to steer and steer.

As shown in FIG. 4, a contact restriction member 7 made of a synthetic resin is arranged at a position where the front vehicle body 2 and the rear vehicle body 4 contact each other when the maximum steering operation is performed. The impact noise due to the collision is suppressed.

Next, the transmission structure will be described. In this work vehicle, as shown in FIG. 3, the shift output of the hydrostatic continuously variable transmission 8 is changed to the differential mechanism 9 and the planetary gear type reduction mechanisms 10, 1.
It is configured to be supplied to the left and right rear wheels 3, 3 via 0 to drive the vehicle. In the figure, 11 is a negative brake, which is configured to prevent movement of the vehicle body during parking. Then, the respective axles 12 for the left and right rear wheels 3, 3,
A wet multi-plate friction brake 13, 13 is provided at 12. More specifically, as shown in FIG. 1, a rotating body 14 that integrally rotates is externally fitted to the outer peripheral surface of each axle 12, and a plurality of annular rotating friction plates 15 are integrally rotatably mounted on the outer peripheral portion of the rotating body 14. Is mounted, an annular fixed friction plate 16 is sandwiched between the rotary friction plates 15, and each fixed friction plate 16 is prevented from rotating by a plurality of fixing pins 17. On the outer side of each of the friction plates 15 and 16, an annular hydraulic piston 20 [an example of a pressing operation tool] is provided on an annular support portion 19 formed on the axle case 18, and the friction plates 15 and 16 are connected to each other. An annular pressing plate 21 is provided on the inner side of the body so that the pressing force is uniformly applied to the entire circumference of the friction plates 15 and 16.
In addition, the differential mechanism exterior case 2 connected to the axle case 18
2 is a receiving portion 2 for receiving and supporting the pressing plate 21.
3 is formed, and the receiving portion 23 and the support portion 19 are formed.
An annular space S is formed on the outer side of the friction plates 15 and 16 by.

As shown in FIG. 2, the pressing plate receiving portion 23 has notches 24 formed at predetermined intervals in the circumferential direction, and by the notches 24, the annular space S and the radially inner side are formed. The oil passage L communicates with the oil storage space R. In this way, the friction plate 1 accompanying the braking operation
The cooling effect of the hydraulic oil on the friction heat of the friction plates 5 and 16 effectively acts on the inner and outer sides of the friction plates 15 and 16 in the radial direction, thereby improving the cooling effect. In addition, the receiving action of the pressing plate 21 can be reliably received by the pressing plate receiving surface which is arranged at an appropriate interval in the circumferential direction, and the braking function is not hindered.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a sectional view of a friction brake.

FIG. 2 is a side view of the plate receiving portion.

[Fig. 3] Transmission system diagram

FIG. 4 is a perspective view of a body frame

FIG. 5 is a side view of a front loader work vehicle.

[Explanation of symbols]

 12 axles 13 wet multi-plate friction brakes 15 and 16 friction plates 20 pressing operation tools 21 pressing plates L oil passage S annular space R oil storage space

Claims (1)

[Claims] 1. A wet multi-plate friction brake (13) is provided on an axle (12), and annular friction plates (15) and (16) of the friction brake (13) are attached to an annular pressing operation tool (20).
And a ring-shaped pressing plate (21) and a ring-shaped space (S) is formed on the radially outer side of the friction plates (15) and (16). The annular space (S) and the friction plates (15), (1
6) A power transmission structure for a work vehicle in which an oil passage (L) communicating with the radially inner oil storage space (R) is formed.