JPS5926111Y2 - Braking devices for agricultural tractors, etc. - Google Patents

Description

[Detailed description of the invention] This invention relates to a braking device for agricultural tractors, etc. The anchor pin of a wet disc brake is not only provided as an anchor for the actuator and the stay plate, but also for the anchor pin between the case, brake housing, and cover. It can also be used as a dowel pin for positioning, making it possible to reduce machining man-hours and improve accuracy.

Conventionally, the anchor pin and dowel pin were constructed as separate parts, which resulted in an increase in the number of parts, a complicated structure, an increase in the number of processing steps, and a decrease in accuracy.

The present invention aims to avoid the above-mentioned problems when the anchor pin and the dowel pin are constructed as separate parts, and will be explained as follows with reference to the drawings.

A drive shaft 3 supported by a rear axle case (brake shaft case) 1 in FIG. 1 via a bearing 2 has its front end connected to the engine via a reducer, clutch, etc. (not shown), and its rear end It is connected to the left and right first rear axles (brake shafts) 5 through the differential mechanism 4 in the case 1.

A gear 8 on a second rear axle 7 meshes with a gear 6 on each axle 5, and a rear wheel 9 is attached to an end of the second gear axle 7.

A brake housing 11 is provided on both left and right end surfaces of the rear axle case 1, and a cover 1 is provided on the end surface of the brake housing 11.
2 are fastened with a plurality of bolts 13, 14, respectively, and the case 1, the housing 11. The three parts of the cover 12 have their angular positions fixed around the rear axle 5 by a common anchor pin 15 which also serves as a knock pin.

That is, the main body of the anchor pin 15 fits into the hole 16 of the bouquet housing 11 and the hole 17 of the cover 12, and the concentric small diameter portion 18 provided at the tip fits into the hole 19 of the case 1.

Reference numerals 21 and 22 denote a pair of annular actuators surrounding the rear axle 5, which are supported by multiple cylindrical support surfaces provided on the inner surface of the brake housing 11, and which slide in the direction of the center line of the rear axle 5 at positions concentric with the rear axle 5. Free to move.

The actuator 21.22 has a plurality of cam grooves 23.24 on its opposing surface, and a pair of cam grooves 23.2 facing each other.
Ball 25 is in the 4th place.

Both actuators 21, 22 are biased toward each other by a plurality of tension springs 26, so that the ball 25 normally stops at the deepest position of the cam groove 23, 24.

The cam grooves 23 and 24 have a letter shape as shown in FIGS. 2 and 3 when viewed in the axial direction.
The cam groove 24 provided in the other actuator 22 has a shape that becomes shallower as it goes in the direction opposite to the direction (arrow A) in which the actuator 21 is driven by the pin 28 engaged with the pin 28 . A) It has a shape that becomes shallower toward the side.

Each cover 12 is provided with a hole 30 parallel to the rear axle 5, and the protruding end of the cam lever shaft 31 fitted into the hole 30 into the housing 11 has a glossy axle 5 at its tip.
An arm 32 having a pin 28 parallel to the cover 12 is fixed by welding or other means, and a cam lever 34 is fitted into a square shaft 33 protruding outward from the cover 12, and is prevented from being removed with a nut 35. .

The cam lever 34 is connected to the brake pedal (
(both not shown), and during braking when the brake pedal is depressed, the cam lever shaft 31 is driven in the direction of arrow B, and at the same time, the cover side actuator 21 is driven in the direction of arrow A via the pin 28.
(Figures 2 and 4).

The other actuator 22 fits into the anchor pin 15 at the hole 38 of the protrusion 37 facing into the space 29 of the brake housing 11, so that the actuator 22 can freely slide along the anchor pin 15 but is prevented from rotating. .

Between the cover 12 and the cover-side actuator 21,
A brake disc 39 spline-fitted to the rear axle 5 faces the back of the actuator 21, and the disc 3
9 and the friction surface of the cover 12.
0, the plate 40 engages with the anchor pin 15 in the recess 42 provided in the outer peripheral projection 41 (FIG. 3), and rotation of the plate 40 is therefore prevented by the anchor pin 15.

Between the back surface of the actuator 22 and the friction surface of the rear axle case 1, discs 39 spline-fitted to the rear axle 5 and steel plates 40 prevented from rotating by anchor pins 15 are alternately interposed.

The rotational force of the engine is transferred from the drive shaft 3 to the differential mechanism 4 and the first
, are transmitted to the rear wheels 9 via the second rear axles 5 and 7.

When braking, the cam lever 34 is activated by operating the brake pedal.
By turning the cover side actuator 21 in the direction of arrow B, the cover side actuator 21 rotates in the direction of arrow A (FIGS. 2 and 4), and both actuators 21 and 22 move away from each other and expand). In this case, the tooth disk 39 spline-fitted to the rear axle 5 is stopped from rotating by the anchor pin 15.

The plate 40 or the cover 12 is pressed against the rear axle case 1 and exerts a braking force on the rear axle 5.

As explained above, according to the present invention, the anchor pin 15
performs its original function of preventing the rotation of the actuator 22 and the stay plate 40, and at the same time, the rear axle case 1, brake housing 11. It plays the role of a dowel pin that fixes the angular position of the cover 12, and the number of parts is reduced, the structure is simplified, and the number of processing steps is reduced.

It also has the advantage of improving accuracy.

In the present invention, for example, the actuator 22 on the side of the rear axle case 1 is fitted into the anchor pin 15 which also serves as a hook pin at the hole 38 formed in the protrusion 37 and is held unrotatably. By making the side actuator 21 and the brake disc 39 spline-fitted on the first gloss axle 5 face each other, and aligning the direction in which the brake disc 39 rotates during forward movement and the direction in which the actuator 21 rotates during braking, forward movement is achieved. It is possible to improve the effectiveness of the brake by generating a self-energizing action only when braking inside the vehicle.

Therefore, in this case, there is an advantage in that the danger caused by over-effectiveness of the brakes when traveling backward can be reliably prevented.

If the present invention is embodied as shown in the drawing, the direction in which the actuator 21 rotates during braking (arrow A) coincides with the direction in which the disc 39 rotates during forward movement.
1 is dragged by the tooth disk 39, a servo effect (boosting effect) occurs, and the braking operation force is reduced.

Furthermore, since an arm 32 having a pin 28 parallel to the rear axle 5 at its tip is fixed to the cam lever shaft 31, a slight change in the angle of the cam lever shaft 31 will cause the position of the pin 28 to change significantly, resulting in a gap between the cam lever 34 and the brake pedal. The link mechanism can be easily adjusted and the pedal stroke can be reduced.

[Brief explanation of drawings]

Figure 1 is a horizontal sectional view, and Figures 2, 3, and 4 are II-II, III-III, IV-IV of Figure 1, respectively.
FIG. 1... Rear axle case (brake shaft case), 5... Rear axle (brake shaft), 11
...Brake housing, 12...Cover, 15...Anchor pin (knock pin),
21.22... Actuator evening, 23.24.
...Cam groove, 25. Curved ball, 28. Curved pin (rotating operation mechanism), 39. Curved disk, 4o. Curved tail plate.

Claims (1)

[Scope of utility model registration request] The brake housing is positioned at the end of the brake shaft case, and the cover is positioned at the end of the brake housing using a common dowel pin parallel to the brake shaft, and then tightened with bolts. supporting annular actuators, engaging one actuator with a rotation operation mechanism linked to a brake pedal;
Insert the hole of the other actuator into the above dowel pin,
Fit a ball into the cam groove for actuator expansion provided on the opposing surfaces of both actuators, and connect one side between the friction surface of the brake shaft case and the back of the actuator on the brake shaft case side, and between the friction surface of the cover and the back of the actuator on the cover side. Or a braking device for an agricultural tractor, etc., characterized in that a tooth disk spline-fitted to a brake shaft and a plate whose rotation is prevented by a dowel pin are arranged on both sides.