JP2583937Y2 - Wet brake lubrication system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for a wet brake in an industrial vehicle such as a construction vehicle, a transportation vehicle, and an agriculture / forestry vehicle.

[0002]

2. Description of the Related Art A lubricating oil common to a central transmission case and left and right axle cases is used for lubrication of wet brakes provided on the left and right of a final drive shaft of a power transmission device that transmits power from a prime mover via a gear train to an axle. Oil level,
It is already known to increase the wet brake disposed on the final drive shaft until lubrication becomes possible. In addition, when mounting the left and right axle cases to the transmission case, positioning by knock pins is already known.

[0003]

The lubrication of the wet brake is achieved by using the oil level of the lubricant common to the central transmission case and the left and right axle cases until the lubrication of the wet brake disposed on the final drive shaft becomes possible. In order to increase the height, the final drive shaft is one step higher than the axle, so the large space of the transmission case and the left and right axle cases must be filled with lubricating oil, and a large amount of lubricating oil is required. In addition, the loss of power due to the rotation of the gears in the filled lubricating oil was large. Further, when the left and right axle cases are mounted on the transmission case, the number of parts increases when the positioning is performed by the knock pins.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a wet brake provided on the left and right of a final drive shaft of a power transmission device for transmitting power from a prime mover via a gear train to an axle, which is mounted on both sides of a central transmission case. The return oil of the pressurized oil was guided to one side of the axle case, and a pipe penetrating through the transmission case was protruded to the left and right from the width of the transmission case, and the pipes were disposed in the left and right axle cases. The above-mentioned problem has been solved by connecting the left and right axle cases to the transmission case while connecting them to the forced lubrication oil passage of the wet brake.

[0005]

The power from the prime mover reaches the final drive shaft via the gear train, and is further divided into left and right and transmitted to the axle. By braking one side of the wet brake provided on the left and right of the final drive shaft, The vehicle turns to that side and the vehicle stops by braking both sides simultaneously. When lubricating such a wet brake, the return oil of the pressure oil led to one side of the axle case mounted on both sides of the central transmission case, one side immediately below, the other side the one side oil passage ,
Oil is forcibly supplied immediately below via a pipe passing through the transmission case and an oil passage on the other side.
As a result, it is not necessary to fill the transmission case and the left and right axle cases with a large amount of lubricating oil, and power loss due to rotation of the gears is reduced. Further, since the pipes are protruded right and left beyond the width of the transmission case, positioning is performed when the left and right axle cases are mounted on the transmission case, so that the knock pin can be omitted, and the number of parts is reduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a transmission for transmitting power to a final traveling device includes a central transmission case 1 and an axle case mounted on the left and right sides thereof. Built in 2, 2 '. The power that has entered the transmission case 1 from the prime mover via the gear train is transmitted to the differential case 3 integrated with the ring gear, and the right and left final drive shafts fitted into the internal diameter splines of the differential gears 4 and 4 ′ incorporated in the differential case 3. Final drive gears 6, 6 'provided integrally with 5, 5'
To the axle gears 7, 7 ', and the axle gears 7, 7'
Are driven.

The bearings 9 of the final drive shafts 5, 5 '
On the outside of 9 ', a plurality of disks whose inner diameters are fitted to the splines of the final drive shafts 5, 5' and rotate together, and are interposed on those disks, a part of the outer diameter of which is axle Wet brakes 11 and 11 ′ are mounted on the inner surfaces of the cases 2 and 2 ′ and the fixing pins 10 and 10 ′ that straddle the outer surfaces of the covers 15 and 15 ′.

When braking the axle 8, the axle case 2
By rotating a brake lever 12 provided outside the cam plate 13, the cam plate 13 is rotated, and a plurality of balls 14 interposed in a circumferential groove between the inner wall of the axle case 2 and the cam plate 13 are piled up. The disc and the plate are strongly pressed against the wall surface of the cover 15 supporting the bearing 9 by riding, and the final drive shaft 5 is driven by the strong frictional force between the plate and the disc, which is locked for rotation. The rotation is braked, and the axle 8 stops, and the differential axle 8 'is accelerated by the differential function of the differential gear 4, so that the vehicle body turns to the braked side. When the rotation of the brake lever 12 is returned to its original position, the ball 14 is accommodated in the circumferential groove, the cam plate 13 moves outward by the urging force of the spring 16, and a gap is generated between the disk and the plate. Of the final drive shaft 5
Transmits power to the axle 8 without receiving braking. The same operation and action are performed when braking the axle 8 'on the other side and turning to the other side. In order to stop the forward movement of the vehicle body, first, the clutch is disconnected and the left and right brake pedals are simultaneously depressed, and the brake levers 12, 12 'are depressed.
Are simultaneously rotated, so that the left and right final drive shafts 5,
By simultaneously braking 5 ', the rotation of the axles 8, 8' is stopped.

Above the axle cases 2 and 2 ′, for example, ports 17 and 17 ′ for guiding return oil of pressure oil for power steering are provided, and one axle case 2 has a return pipe for pressure oil. 18 and a plug 19 are mounted, and a plug 19 'is mounted on the axle case 2' on the other side. Further, oil passages 20, 20 'are provided horizontally above the axle cases 2, 2'.
A connecting pipe 21 is provided to connect the oil pipes 0 and 20 ′, and the return oil sent from the return pipe 18 is directly supplied from the port 17 or through the oil passage 20 and the connecting pipe 2.
1, a wet brake 1 built in each axle case 2, 2 'from a port 17' via an oil passage 20 '
1,11 'is forcibly refueled.

As shown in FIG. 1, the connecting pipe 21 penetrates through the central transmission case 1 to connect the oil passages 20, 20 'as described above, and the ends thereof extend to the left and right axles. The transmission case 1 and the axle case 2 are fitted into the fitting holes of the cases 2 and 2 ′.
Since the positioning accuracy when assembling 2 'is maintained, it is not necessary to prepare a new knock pin, and the number of parts can be reduced.

[0011]

According to the present invention, the final drive shafts 5, 5 'of the power transmission device for transmitting power from the prime mover via the gear train to the axle 8 are provided.
In the wet brakes 11 and 11 ′ provided on the left and right sides, the return oil of pressure oil is guided to one side of the axle cases 2 and 2 ′ mounted on both sides of the central transmission case 1, and penetrates the transmission case 1. Wet brakes 11, 11 ′ having transverse connecting pipes 21 projecting from the width of transmission case 1 to the left and right, and connecting pipes 21 disposed in axle cases 2, 2 ′ on both the left and right sides.
Of the transmission case 1 and the axle cases 2 and 2 ′ by connecting the left and right axle cases 2 and 2 ′ to the transmission case 1. It is possible to reduce the power loss of lubricating oil agitation by gears and to reduce the number of parts at the time of assembly. Axle case 2
The return oil can be sufficiently supplied to the wet brakes 11, 11 'even from the 2' side.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a wet brake.

FIG. 2 is a side view of the same with a part cut away.

[Explanation of symbols]

 Reference Signs List 1 transmission case 2 axle case 5 final drive shaft 8 axle 11 wet brake 17 port 20 oil passage 21 connecting pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 57/02 B60K 17/30 F16D 55/40 F16D 65/853

Claims (1)

(57) [Scope of request for utility model registration] 1. At both sides of a central transmission case 1 in wet brakes 11, 11 'provided on the left and right of final drive shafts 5, 5' of a power transmission device for transmitting power from a prime mover via a gear train to an axle 8. The return pipe of the pressurized oil is guided to one side of the axle cases 2 and 2 ′ attached to the
Project from the width of the transmission case 1 to the left and right, and connect the connecting pipe 21 to the left and right both axle cases 2,
2 'is connected to the forced lubrication oil passages of the wet brakes 11, 11' arranged in the
A lubricating device for a wet brake, wherein 2 'is positioned when it is mounted on the transmission case 1.