JP2711603B2 - Parking brake device for self-propelled work equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled working machine, such as an agricultural tractor or a combine, that drives a rubber tire or a crawler wheel by an engine to run on a road or a field, and is particularly attached to a steering brake. Parking brake.

[0002]

2. Description of the Related Art Generally, a turning brake is a friction clutch for connecting an engine to left and right wheels or crawler wheels (hereinafter referred to as wheels) and a friction brake for stopping a driven side thereof.
The friction clutch and friction brake
The rake is integrally formed on the main shaft connected to the engine in order to make the structure compact. Conventionally, in a working machine using a steering brake, a parking brake whose structure is simplified by using a part of the configuration of the steering brake is additionally provided.

[0003]

As described above, the steering brake itself has a structure in which a friction clutch and a friction brake are integrally connected, and the structure is complicated. It has a shaped structure, and if a parking brake is attached to it, the structure becomes more complicated,
External shape or becomes large, there is a problem rather invited a decrease in the work of the assembly.

[0004]

Means for Solving the Problems To solve the above problems,
Because the main shaft 4 with the input gear 4a to transfer kinetic casing 2 rotatably supporting the output gear 4b adjacent to the input gear 4a on its main axis 4, 4b together with rotatably supporting ,
Friction brake for arresting the friction clutch 6 for connecting the input gear 4a and the output gear 4b driven side of the friction clutch 6
Only set the key 7, the friction clutch 6 the friction brake 7
A braking outer wheel 7b connected to the output gear 4b through the pressing gear 7c and a pressure receiving plate 7d engaged with the braking outer wheel 7b;
A friction plate 7e engaged with a braking inner ring 7a connected to the transmission case 2 ; the friction plate 7e is interposed between the pressing plate 7c and the pressure receiving plate 7d so as to be able to squeeze; of the shaft portion Tj pivoted the Sotoha member 8a rotatably, their by external gear member 8a dog clutch 8e formed in the end portion engaged in a freely separated from the pressure receiving plate 7d, the
The friction plate 8b supported by the external tooth member 8a is
Shall engage detachably frictionally engaged by the cam shaft 9 against the
It is.

[0005]

When the parking brake 8 is operated to stop, the external teeth member 8a connected to the wheels and the like frictionally engages the transmission case 2 and does not rotate. That is, when the cam shaft 9 is rotated, the pressing plate 8d advances toward the pressure receiving surface 8c, and presses and stops the friction plate 8b supported by the external tooth member 8a. The external tooth member 8a is connected to a braking outer wheel 7 of the friction brake 7 via a dog clutch 8e.
b, and further connected to the output gear 4b via the friction clutch 6, so that the movement of the self-propelled working machine 1 is restricted. The external teeth member 8a constituting the parking brake 8 has a friction brake.
The rake 7 is supported by the shaft portion 7j of the braking inner ring 7a, and
Since the parking brake 8 is coupled to the friction brake 7 by the dog clutch 8e, the parking brake 8 can be assembled or disassembled by moving back and forth on the main shaft 4 in the axial direction.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a power system diagram of the self-propelled working machine 1. In the figure,
Reference numeral 1a denotes an engine, which is connected to a sprocket 3a for driving a crawler belt 3 such as left and right wheels via a transmission case 2. That is, the engine 1a is connected to the input shaft 2a supported in the transmission case 2, and the input shaft 2a drives the main shaft 4 via the main clutch 2b and the reduction gear mechanism 2c. Reference numeral 4a denotes an input gear spline-coupled to the main shaft 4. On the main shaft 4, two steering devices 5 separated by an input gear 4a are supported, and the main shaft 4 passing through the steering device 5 is supported.
Is transmitted to the sprockets 3a, 3a via left and right output gears 4b, 4b rotatably fitted on the main shaft 4 and second gear reduction mechanisms 2d, 2d.

As shown in FIG. 2, the steering device 5 includes a friction clutch 6 for connecting the input gear 4a and the output gear 4b, a friction brake 7 for stopping the rotation of the output gear 4b, and the output gear 4b. A parking brake means 8 is provided for locking the case 2 so that it cannot rotate.

The friction clutch 6 comprises an inner member 6a engaged with the main shaft 4 by a spline, an outer member 6b rotatably fitted on the main shaft 4, and a friction plate 6c supported by these members. I have. As is well known, the friction plate 6c is divided into two types: one that is locked to the inner member 6a so as to be unable to rotate only (hereinafter, referred to as spline engagement) and one that is spline-engaged with the outer member 6b. The friction plates 6c are sandwiched between a pressure plate 6d and a pressure receiving plate 6e spline-engaged with the outer member 6b, and are constantly frictionally engaged by a plurality of disc spring groups 6f provided on the inner surface of the outer member 6b. It is clamped in the combined state. Reference numeral 6h denotes a hydraulic piston for further enhancing frictional engagement by the pressing plate 6d. That is, when pressure oil is supplied into the cylinder chamber 6j facing the disc spring group 6f, the pressing force of the pressing plate 6d increases, and when the pressure oil is removed, only the elasticity of the disc spring group 6f remains. As a result, the pinching pressure is reduced and slipping becomes easier. Reference numeral 4c denotes an oil passage for supplying pressure oil to the cylinder chamber 6j.

The friction clutch 6 and the output gear 4b are connected via a meshing clutch 4d. That is, the output gear 4b is connected to the inner member 6a via the needle roller.
The output gear 4b rotates integrally with the main shaft 4 as long as the friction clutch 6 does not slip. Here, when the work implement 1 collides with an obstacle on the ground or when a friction brake 7 described later is operated, the friction clutch 6
Overload acts on the main shaft 4 and the output gear 4b.
And a speed difference is generated between In this embodiment, the pressure in the cylinder chamber 6j is changed between high and low during the steering operation,
The transmission capacity is changed and the hydraulic piston 6h
Is stopped so that the friction clutch 6 becomes easy to slip.

The friction brake 7 comprises a braking inner wheel 7a connected to the transmission case 2 and a braking outer wheel 7 rotatably fitted on the main shaft 4.
b. A pressing plate 7c and a pressure receiving plate 7d are provided on the braking outer ring 7b.
Are movably locked only in the axial direction, and a friction plate 7e locked movably only in the axial direction to the brake inner ring 7a and a friction plate 7e movably locked only in the axial direction to the outer brake wheel 7b are alternately interposed therebetween. It is arranged and pinched. A hydraulic piston 7f is opposed to the back of the pressing plate 7c, and the friction brake 7 performs a braking operation when pressure oil is supplied into the hydraulic cylinder 7h through the oil passage 4e, and the braking is released when the friction brake 7 is removed. You. In addition,
In this embodiment, the outer member 6b constituting the friction clutch 6 and the brake outer wheel 7b of the friction brake 7 are formed as a metallurgically integrated body, but they may be formed separately.

Reference numeral 8 denotes a parking brake. Parking brake 8
Is configured such that the pressure receiving plate 7d of the friction brake 7 is locked to the transmission case 2 by the friction plate 8b . That is, the parking brake 8 is formed by the shaft portion 7j formed on the inner brake wheel 7a.
The outer teeth member 8a is rotatably supported by the outer teeth member 8a. The external tooth member 8a is coupled to a pressure receiving plate 7d of the friction brake 7 only in the axial direction via a dog clutch 8e provided at an end thereof. A friction plate 8b is provided on the outer periphery of the external tooth member 8a.
Are alternately arranged on the transmission case 2 with the friction plates 8b movably engaged only in the axial direction. The friction plates 8b , 8b are sandwiched between a pressure receiving surface 8c formed on the transmission case 2 and a pressing plate 8d, and are configured to be able to be squeezed by the cam shaft 9.

As shown in FIG. 3, the camshaft 9 is disposed substantially in the radial direction, and is rotatably supported by the transmission case 2 to be rotatable.
And a notch 9b provided at the inner end of the camshaft 9, and an operation lever 9c is welded to an end protruding from the transmission case 2. Notch 9b is shaft 9a
The lower end of the control lever 9c is substantially semicircular.
However, when the rotary operation is performed, the pressing plate 8d is pressed to advance to the pressure receiving surface 8c side, and the friction plate 8b is pressed to lock or unlock the rotation, or to release.

Therefore, the input gear 4 is driven by the engine 1a.
a, When the main shaft 4 rotates, the rotation is transmitted to the sprocket 3a via the steering device 5. When the vehicle is steered to the right, the right steering device 5 operates to stop the output gear 4b, and the vehicle is driven only by the left wheel 3a, and as a result, steers to the right. When parking the vehicle, operating the operation lever 9c after stopping the vehicle causes the cam shaft 9 to rotate and the parking brake 8 to be in the braking state, thereby preventing the pressure receiving plate 7d of the friction brake 7 from rotating. Thus, accidental movement of the vehicle is avoided.

[0014]

As described above, according to the present invention, the parking brake 8 is additionally provided to the friction brake 7 constituting the steering brake 5 via the dog clutch 8e.
Without greatly changing the configuration of the conventional steering brake 5 ,
A parking brake function can be provided. Further, since the relationship between the parking brake 8 and the steering brake 5 is merely the engagement by the dog clutch 8e, there are effects such as easy assembly and disassembly.

[Brief description of the drawings]

FIG. 1 is a power system diagram of a self-propelled working machine.

FIG. 2 is an enlarged sectional view of a main part thereof.

FIG. 3 is a view taken in the direction of the arrow III.

[Explanation of symbols]

4 ... Main shaft 4a ... Input gear 4b ... Left and right output gear 5 ... Two steering devices 6 ... Friction clutch 7 ... Friction brake 8 ...・ Parking brake, 8a ・ ・ ・ External teeth member,

Claims (1)

(57) [Claims] 1. A spindle 4 having a input gear 4a to the transmission case 2 rotatably supports the input gear 4 on its main axis 4
a to rotatably support the output gears 4b and 4b adjacent to the input gear 4a and to connect the input gear 4a and the output gear 4b.
Only set a friction brake 7 for restraining the driven side of the clutch 6 with its friction clutch 6, the friction brake 7 through the friction clutch 6 output gear
4b, the pressing plate 7c and the pressure receiving plate 7d engaged with the braking outer wheel 7b, and the transmission case 2.
A friction plate 7e engaged with the continuous braking inner ring 7a, the friction plate 7e being interposed between the pressing plate 7c and the pressure receiving plate 7d so as to be able to be pressed, and a shaft portion 7j of the braking inner ring 7a. The external tooth member 8a is rotatably supported on the shaft , and the external tooth member 8a is detachably engaged with the pressure receiving plate 7d by a dog clutch 8e formed at an end of the external tooth member 8a. parking brake system of the self-propelled working machine against the plate 8b to the transmission case 2 comprising disengageably frictionally engaged engaged by the cam shaft 9.