JP2509612Y2 - Waterproof structure for brakes of self-propelled vehicles - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a waterproof structure for a brake of a low-speed self-propelled vehicle such as a speed sprayer that sprays pesticides in a field, and more specifically, to a brake shoe inside a brake drum. The present invention relates to a waterproof structure for a brake that prevents water, mud, and the like from entering the brake drum in a self-propelled vehicle in which is installed.

[Conventional technology]

In a low speed vehicle such as a speed sprayer, a brake shoe is often arranged in the brake drum, and a brake that makes frictional contact with the inner circumference of the brake drum due to expansion or the like is often used. In addition, the brake is placed adjacent to the wheel with tires mounted on the periphery, and the tire diameter is made small in order to keep the height of the vehicle as low as possible. It is easy to sink into the ground with the tire. In a conventional low-speed vehicle, the back plate does not completely close the opening side of the brake drum, and there is a gap between the outer edge of the back plate and the brake drum.

[Problems to be solved by the device]

Therefore, in a conventional low-speed vehicle, when the tire is deeply buried in the ground, water, mud, etc. enter the brake drum through the gap between the outer peripheral edge of the back plate and the brake drum, and the low-speed running At times, the heat generated in the brake shoe is small, and since water etc. remains for a long time without evaporating, it causes rust on the inner circumference of the brake drum and this water, mud, etc. Adhesion is caused, which leads to accelerated wear of the brake shoes and uneven wear. In order to avoid this, it is necessary to increase the number of regular inspections, which is troublesome.

An object of the present invention is to provide a waterproof structure for a brake of a self-propelled vehicle that prevents water and the like from entering the brake drum and eliminates the above-mentioned harmful effects.

 The invention also aims to:

(1) A common brake drum can be used for mounting wheels having different diameters, various brake drums need not be prepared and stored, and replacement of the brake drum can be omitted when replacing the wheels. .

(2) Prevent water, etc. from adhering to the outer surface of the brake drum.

(3) Since the cover covers the part of the brake drum that is not covered by the back plate, the cover can complement the function of the cover of the brake drum.

(4) The peripheral speed of the portion of the sealing material of the relative rotating portion of the waterproof structure for a brake is reduced, and the durability and life of the sealing material are improved. In addition, it should be possible to use a commercially available inexpensive and small diameter sealing material.

(5) Since the common brake drum can be used for different kinds of wheels, the first seal material can be also common for various wheels.

(6) To prevent water, mud, etc. from entering between the wheel flange and the brake drum along the axle.

[Means for solving the problem]

The invention will be described using the reference numerals of the drawings corresponding to the embodiments.

The waterproof structure for a brake of a self-propelled vehicle of the present invention is integrally and rotationally coupled to the axle (10) and the wheel (42).
And a wheel flange (34) for detachably fixing the wheel, and a protruding boss portion on the wheel flange (34) side that is integrally and rotationally connected to the axle (10) inside the wheel flange (34) in the axial direction of the vehicle. Brake drum (32) that has (50) and is open on the side opposite the wheel flange (34)
A brake shoe (62) disposed in the brake drum (32) that comes into frictional contact with the inner surface of the brake drum (32) by displacement, and an axle housing (18) that surrounds the axle (10) in the radial direction. , A wheel (42) fixed to the wheel flange (34) and a back plate (56) fixed to the axle housing (18) and covering the opening side of the brake drum (32) at the inner peripheral edge, and a back plate at the outer peripheral edge. A cover (66) that joins with the outer peripheral edge of the plate (56) to partition the space for housing the brake drum (32) inside in cooperation with the back plate (56), and the inner peripheral edge of this cover (66). And a first seal member (72) that closes the annular gap between the brake drum (32) and the protruding boss portion (50) of the brake drum (32) while allowing relative rotation, and the tightening member (39).
Tightens the brake drum (32) and the wheel flange (34) in the axial direction of the axle (10), and the tightening member (39) is attached to the side edge of the wheel flange (34) with a waterproof cap (40). With the axle (1
The shaft end of (0) is covered in a watertight manner. Then, the second seal material (52) is fitted to the joint between the wheel flange (34) and the brake drum (32).

[Action]

The wheel (42) is detachably fixed to the wheel flange (34), and the cover (66) is joined to the outer peripheral edge portion of the back plate (56) at the outer peripheral edge portion to form the brake drum (3).
The space for accommodating 2) inside is partitioned in cooperation with the back plate (56), and the first sealing material (72) is covered by the cover (6).
6) and the protruding boss (5) of the brake drum (32).
(0) allowing relative rotation with respect to the wheel flange (34) and the brake drum by the tightening force of the tightening member (39). The joint with the (32) is in a sandwiched state, and thus water and mud are blocked by the back plate (56), the cover (66), the first seal material (72) and the second seal material (52). Thus, the brake plate (56) and the brake drum (32) inside the cover (66) are prevented from entering the accommodation space and the axle (10).

〔Example〕

 Hereinafter, this invention will be described with reference to embodiments of the drawings.

The drawing is a cross-sectional view of a waterproof structure for a brake of a speed sprayer as a low speed vehicle. The axle 10 penetrates the chain case 12 at the widthwise inner end of the speed sprayer, and the sprocket 14 is disposed in the chain case 12 and integrally spline-fitted to the end of the axle 10 in the rotational direction. There is. A chain (not shown) is hung on the sprocket 14, and the axle 10 receives rotational power from the engine via the chain. The inner bearing case 16 and the outer bearing case 18 are arranged inside and outside the chain case 12 in the width direction of the speed sprayer,
The chain case 12 is joined to the inner and outer side walls with packings 20 and 22 interposed. Ball bearing 24,26
The outer ring side is fixed to the inner bearing case 16 and the outer bearing case 18, respectively, and the inner ring side is fixed to the axle 10. The bolt 28 penetrates the flange portion of the outer bearing case 18, the packing 22 and the side wall of the chain case 12,
The nut 30 is fixed to the inner surface side of the side wall of the chain case 12, screwed with the bolt 28, and cooperates with the bolt 28 to fix the outer bearing case 18 to the chain case 12.

The brake drum 32 and the wheel flange 34 are attached to the axle 10
From the outer end of the to the end of the axle 10, fitted in that order,
It is displaceable in the axial direction and is spline-fitted integrally in the rotational direction. A pad plate 36 and a washer 38 are further fitted to the outer end of the axle 10, and finally a tightening screw 39
Is screwed to the end of the axle 10, tightens the brake drum 32 and the wheel flange 34 toward the outer bearing case 18 via the contact plate 36, and removes the brake drum 32 and the wheel flange 34 from the axle 10. To prevent. The waterproof cap 40 is fixed at its peripheral edge to the end of the wheel flange 34 so as to cover the tightening screw 39. Wheel 42
Is detachably fixed to the wheel flange 34 by the mounting bolts 44 at the inner peripheral edge portion, and the tire 46 is mounted on the outer peripheral side. The brake drum 32 has a chain case on the opening side.
The needle bearing 48 is fitted to the outer bearing case 18 between the inner circumference of the end portion and the outer circumference of the boss portion on the opening side of the brake drum 32, and supports the both in a relatively rotatable manner. There is. The protruding boss portion 50 is integrally formed so as to protrude from the end surface portion of the brake drum 32 toward the wheel 42, and the wheel flange 34 is inserted on the inner peripheral side. The O-ring 52 as a sealing material is a wheel flange.
It is fitted into an annular groove at the joint between the 34 and the protruding boss portion 50, and prevents water or the like from entering the axle 10 from the outside. The oil seal 54 is fitted to the inner peripheral step of the outer bearing case 18 outside the ball bearing 26 in the left-right direction of the axle 10, and prevents oil from leaking from the chain case 12.

The back plate 56 has an inner peripheral end surface portion fixed to the flange portion of the outer bearing case 18 with bolts 58 and nuts 60, spreads so as to cover the opening of the brake drum 32, and an outer peripheral edge portion of the brake plate 32 further extends. It reaches the outside in the radial direction. The brake shoe 62 is a brake drum.
It is housed inside 32 and contacts the inner peripheral surface of the brake drum 32 by friction due to expansion. The expansion of the brake shoe 62 is performed by a pulling operation or hydraulic pressure, and a wire or a pipe 64 penetrates a predetermined hole of the back plate 56 to make the brake drum.
It extends from the inside of 32. A predetermined seal is attached to the wire of the back plate 56 or the penetrating portion of the pipe 64 to prevent water or the like from entering through the penetrating portion. cover
66 has an end surface portion that covers the wheel 42 side of the brake drum 32 and a tubular portion that covers the outer peripheral side of the brake drum 32, and partitions a space for housing the brake drum 32 together with the back plate 56. The packing 67 is a back plate 56 and a cover 66.
The bolt 68 is inserted between the joint flange and
6, after being inserted through the packing 67 and the back plate 56, the nut 70 is screwed into the tip end, and the cover 66 and the packing
67 and back plate 56 are clamped together. The seal 72 is fitted in the center hole of the end face portion of the cover 66 at the outer peripheral portion thereof, and the outer peripheral portion of the projecting boss portion 50 is rotationally slid at the inner peripheral portion, so that water from the center hole of the cover 66 to the inside of the cover 66. Etc. are prevented from entering.

By the back plate 56, the cover 66, the seal 72, etc.,
A sealed space for housing the brake drum 32 is formed inside the back plate 56 and the cover 66, and water and mud are prevented from entering the brake drum 32.

[Effect of device]

 The invention of claim 1 is as follows.

(1) The wheel flange is formed separately from the brake drum, and the wheel is connected not to the brake drum but to the wheel flange. Therefore, when replacing the wheel with a different diameter, replace only the wheel flange with the specified one. Good. Therefore, the replacement of the brake drum is omitted, the wheel replacement work is easy, and the labor for preparing and storing various brake drums can be eliminated.

(2) Since the outer surface side of the brake drum is covered with the cover, it is possible to prevent water and the like from adhering to the outer surface of the brake drum.

(3) Since the cover covers the part of the brake drum that is not covered by the back plate, the function of the cover of the brake drum can be complemented.

(4) Since the first sealing material is provided not at the peripheral portion of the brake drum but at the peripheral portion of the protruding boss portion, not only is mud or water less likely to come into direct contact with the first sealing material, The sliding rotation speed of the sealing material decreases, and as a result,
The durability and life of the sealing material are improved. Further, since the diameter of the first seal material is small, a commercially available inexpensive seal material can be used.

(5) Since the common brake drum can be used for different kinds of wheels, the first seal material can be common for various wheels, which is advantageous in maintenance.

(6) Since the second seal material is fitted to the joint between the wheel flange and the brake drum, it is possible to prevent water or the like from entering the axle through this joint.

(7) Since the shaft end of the axle together with the tightening member is covered in a watertight manner by the waterproof cap attached to the side edge of the wheel flange, the axle is completely waterproof together with the first seal member and the second seal member. Is achieved, which contributes to smooth maintenance such as rusting and corrosion of the axle and replacement of parts of the brake device, for example.

[Brief description of drawings]

The drawing is a cross-sectional view of an embodiment of a waterproof structure for a brake of a speed sprayer as a low speed vehicle. 10 …… Axle, 18 …… Outer bearing case (axle housing), 32 …… Brake drum, 34 …… Wheel flange, 39 …… Tightening screw (tightening member), 42 …… Wheel, 50 …… Projecting boss, 52 …… O-ring (second sealing material), 56 …… Back plate, 62 …… Brake shoe,
66 …… Cover, 72 …… Seal (first sealing material).

Claims (1)

(57) [Scope of utility model registration request] 1. A wheel flange (34) integrally and rotationally connected to an axle (10) and detachably fixed to a wheel (42); and an inner side of the wheel flange (34) in the width direction of a self-propelled vehicle. A brake drum (32) integrally and rotationally coupled to the axle (10) and having a protruding boss (50) on the wheel flange (34) side and an opening on the side opposite to the wheel flange (34), A brake shoe (62) disposed in the brake drum (32) and frictionally contacting the inner surface of the brake drum (32) due to displacement;
An axle housing (18) surrounding the outside of the axle (10) in the radial direction, a wheel (42) fixed to the wheel flange (34), and the brake drum fixed to the axle housing (18) at an inner peripheral edge. The back plate (56) for covering the opening side of the (32) and the space for joining the brake drum (32) inside are joined to the outer peripheral edge of the back plate (56) at the outer peripheral edge. 56) and the inner peripheral edge of the cover (66) that partitions together with the brake drum (3) for the cover (66).
2) a first seal member (72) that closes an annular gap between the protruding boss portion (50) and the protruding boss portion (50) while permitting relative rotation, and the tightening member (39) has the axle shaft (39). The brake drum (32) and the wheel flange (34) are tightened in the axial direction of (10), and a waterproof cap (40) attached to a side edge of the wheel flange (34) is used to tighten the axle together with the tightening member (39). A shaft end of (10) is covered in a watertight manner, and a second seal material (52) is fitted to a joint portion between the wheel flange (34) and the brake drum (32). Waterproof structure for self-propelled vehicle brakes.