JP6917703B2 - Braking device for work platforms - Google Patents

Description

The present invention relates to a braking device for a work vehicle used for various purposes such as transportation of various equipment and materials.

As a braking device for this type of work vehicle, the disc brake on the rear wheel side is configured so that a plurality of friction plates are housed in an outer case and a hydraulic braking operation is performed in the outer case. However, it is known that the disc brake on the front wheel side has a structure equipped inside the disc wheel in a state where the brake plate and the caliper are not housed in the outer case (see, for example, Patent Document 1).

JP-A-2007-321850 (see paragraphs "0028" and "0029" and drawings "FIG. 4" and "FIG. 5").

Like the structure shown in Patent Document 1, it is desired that the disc brake is compactly housed inside the disc wheel on the front wheel side to be steered. Therefore, it is difficult to install the entire disc brake in a state where it is easily increased in size.
Therefore, it is difficult to eliminate the possibility of pebbles and weeds getting in between the disc rotor of the disc brake on the front wheel side and the caliper.

The present invention provides a braking device for a work vehicle suitable as a disc brake on the front wheel side by making it possible to reduce the possibility of pebbles and weeds entering between the disc rotor and the caliper.

The feature of the braking device of the work vehicle in the present invention is
A disc rotor that rotates integrally with the wheel support hub,
Calipers with brake pads are provided at positions facing both sides of the disc rotor.
A cover body for covering the disc rotor is provided at a position on the inner side of the vehicle body on the side opposite to the side where the wheel support hub is located on the disc rotor.
The cover body is provided with a vertical wall surface facing the surface of the disc rotor toward the inside of the vehicle body, and a peripheral wall surface facing the outer peripheral edge of the disc rotor from the outside in the radial direction of the disc rotor.
The vertical wall surface is composed of a flat plate-shaped member.
The peripheral wall surface is connected to the outer peripheral edge of the vertical wall surface, and extends toward the laterally outer side of the vehicle body where the disc rotor is present.
The circumferential length of the peripheral wall surface is formed shorter than the circumferential length of the outer peripheral portion of the vertical wall surface, and between the peripheral end portion of the peripheral wall surface and the circumferential end portion of the caliper. A predetermined interval in the circumferential direction of the disc rotor is provided.
Said predetermined distance, and wherein said vertical wall portion is removed the peripheral wall surface position of said cover member, and the rotation axis direction as viewed in the longitudinal wall portion of the circumferential wall has been removed wheels This means that the disc rotor has an arc shape that follows the outer peripheral shape of the disc rotor, and the portion of the disc rotor that faces the outer side in the radial direction is open toward the traveling direction of the work vehicle.

According to the present invention, a cover body covering the surface of the disc rotor toward the inside of the vehicle body is provided at a position on the inside of the vehicle body opposite to the side where the wheel support hub is located, so that the inside of the vehicle body is provided. The disc rotor can limit the entry of pebbles, weeds, etc. to the existing side as much as possible.
Therefore, there is an advantage that the possibility of pebbles and weeds getting in between the disc rotor and the caliper can be reduced by a simple structure while avoiding an increase in the size of the entire disc brake.
Further, according to the present invention, the cover body is provided with a vertical wall surface facing the inner side of the vehicle body of the disc rotor and a peripheral wall surface facing the outer peripheral side of the disc rotor. It is easier to more accurately control the entry of pebbles and weeds. The circumferential length of the peripheral wall surface is formed to be shorter than the circumferential length of the outer peripheral portion of the vertical wall surface, and a predetermined distance is provided between the circumferential end portion of the peripheral wall surface and the circumferential end portion of the caliper. It is provided. As a result, the frictional heat generated in the disc rotor and the caliper portion can be dissipated by using the predetermined interval, and it is easy to dissipate heat without impairing the entry limiting function of pebbles and weeds.

In the present invention, it is preferable that the vertical wall surface of the cover body and the plate-shaped member constituting the peripheral wall surface are non-perforated plate-shaped members.

In the present invention, the caliper is fixed to an axle support to which the wheel support hub is attached, and the cover body is a portion different from the fixed portion of the caliper to the axle support, and the axle support It is preferable that it is fixed to.

According to the present invention, since the cover body is fixed to the axle support at a place different from the place where the caliper is fixed to the axle support, the cover body can be attached and detached independently without involving the caliper attachment / detachment work. It is easy to perform maintenance work and cleaning.

It is a left side view which shows the work vehicle. It is a partially broken front view which shows the braking device and the cover body mounted on a disc wheel. It is a perspective view which shows the braking device and a cover body. It is a top view which shows the braking device and a cover body. It is a left side view which shows the braking device and a cover body. It is an exploded perspective view which shows the braking device and a cover body.

Hereinafter, an example of the embodiment of the present invention will be described based on the description in the drawings.
Unless otherwise specified, the front-back direction and the left-right direction in the description of the present embodiment are described as follows. That is, the traveling direction on the forward side (see arrow F in FIG. 1) is "forward" and the traveling direction on the backward side (see arrow B in FIG. 1) is "rear" when the work vehicle in the present invention is working. The direction corresponding to the right side of the traveling vehicle body with respect to the forward posture in the front-rear direction is "right", and similarly, the direction corresponding to the left side of the traveling vehicle body is "left".

〔overall structure〕
The multipurpose vehicle (an example of a "working vehicle") shown in FIG. 1 is configured as a vehicle that can be used for various purposes such as carrying a load and recreation.
The multipurpose vehicle is provided with a pair of left and right front wheels 11 as a driveable and steerable traveling device, and a pair of left and right rear wheels 12 as a driveable traveling device. That is, the traveling vehicle body 1 of the multipurpose vehicle is configured to be capable of traveling by a pair of left and right front wheels 11 and a pair of left and right rear wheels 12.
The central portion of the traveling vehicle body 1 is provided with a driving unit 13 on which the operator is boarded and performs a driving operation. A loading platform 14 capable of loading a load is provided at the rear of the traveling vehicle body 1. Below the loading platform 14 of the traveling vehicle body 1, a driving unit including a water-cooled gasoline engine 15 and the like is provided.

As shown in FIG. 1, the driving unit 13 is surrounded and protected by a frame-shaped rops frame 16. The driver unit 13 is provided with a driver seat 17 in which the driver is seated and an auxiliary seat (not shown) in which the passenger is seated. Further, the driving unit 13 is provided with a steering handle 18 for steering operation of the left and right front wheels 11, a brake pedal 19 capable of braking the traveling vehicle body 1, and the like.

[Brake device]
A braking device 3 that is braked when the brake pedal 19 is depressed is provided inside the disc wheel 20 of the front wheel 11.
As shown in FIG. 2, the left and right front wheels 11 are pivotally supported by a front axle case 21 (corresponding to an axle support) independently suspended via a suspension mechanism (not shown).
Then, the front axle 22 mounted on the front axle case 21 and the transmission shaft 23 extended from the front differential device (not shown) are connected by a ball joint (not shown) to the outside of the front axle 22. The disc wheel 20 of the front wheel 11 is attached to the disc-shaped wheel support hub 24 provided at the end so as to be integrally rotatable.

That is, as shown in FIGS. 2 to 6, the front axle 22 is inserted into the wheel support hub 24, and the fixing nut 25 is attached to the outer end of the front axle 22. A spline shaft portion 22a and a screw shaft portion 22b having a spline groove formed therein are provided at the outer end portion of the front axle 22. A wheel support hub 24 having a spline cylinder portion (not shown) that fits outside the spline shaft portion 22a on the inner peripheral side is composed of a stop nut 25a and a decorative nut 25b that are screwed into the screw shaft portion 22b. It is tightened to the fixing nut 25 and is integrally rotatably connected and fixed to the front axle 22.
Four bolt holes 24b in the circumferential direction are formed on the laterally outward surface 24a of the wheel support hub 24. The disc wheel 20 supports the wheels by tightening the fixing bolts 26 screwed into the bolt holes 24b in a state where the mounting surface 20a of the disc wheel 20 is attached to the laterally outward facing surface 24a of the wheel support hub 24. It is fixed to the hub 24.

Of the wheel support hubs 24, support protrusions 24c for mounting and fixing the disc rotor 30 of the braking device 3 project at four locations on the opposite side of the laterally outward facing surface 24a to which the mounting surface 20a of the disc wheel 20 is applied. It is installed.
The disc rotor 30 is formed with four connecting holes 30a. A connecting bolt 27 is inserted into each of the connecting holes 30a and screwed into a bolt hole (not shown) formed in the support projection 24c so that the disc rotor 30 rotates integrally with the wheel support hub 24. It is connected and fixed to.

Of the braking devices 3, the caliper 31 that applies braking force to the disc rotor 30 is attached to the front axle case 21 at a location on the front side of the front axle 22 as shown in FIGS. 3 to 5.
The caliper 31 is provided with brake pads (not shown) at positions facing both side surfaces of the disc rotor 30, and is provided on a part of the disc rotor 30 in the circumferential direction while straddling the disc rotor 30.

The caliper 31 is a floating type. Although not shown, a cylinder portion containing a pressing piston that generates braking pressure is provided at a location on the inner side of the vehicle body opposite to the location where the wheel support hub 24 is located, rather than the location where the disc rotor 30 is located. ..
By supplying pressure oil to the cylinder portion of the caliper 31, the brake pads sandwich both side surfaces of the disc rotor 30 to generate braking force.
The entire wheel support hub 24, disc rotor 30, and caliper 31 are provided in the space on the inner peripheral side of the rim portion 20b of the disc wheel 20.

[Cover body]
As shown in FIGS. 3 to 6, a cover covering the inner surface of the disc rotor 30 toward the inner side of the vehicle body, except for the portion where the caliper 31 is present, is located on the inner side of the vehicle body of the disc rotor 30. Body 4 is provided.
As shown in FIGS. 4 and 6, the cover body 4 is oriented in the opposite direction along the circumferential direction of the disc rotor 30 in a side view, except for a portion surrounding the peripheral portion of the front axle 22 and where the caliper 31 is present. It is formed in a C shape.

The cover body 4 includes a vertical wall surface 40 facing the surface of the disc rotor 30 toward the inside of the vehicle body, and a peripheral wall surface 41 facing the outer peripheral surface of the disc rotor 30.
The vertical wall surface 40 has a recessed inner peripheral edge 40a that surrounds the peripheral portion of the front axle 22 formed on the inner side in the radial direction, and front axle cases are formed at four locations on the vertical wall surface 40 in the vicinity of the inner peripheral edge 40a. The fixing nut 42 for connecting to 21 is welded and fixed, but the other parts are composed of a flat plate-like member having no holes.

The peripheral wall surface 41 connected to the outer peripheral side of the vertical wall surface 40 is formed to be curved in an arc shape along the outer peripheral surface of the disc rotor 30, and is also formed of a non-perforated plate-shaped member.
The peripheral wall surface 41 extends diagonally laterally outward from the inner peripheral edge side connected to the outer peripheral edge of the vertical wall surface 40 toward the lateral outer side of the vehicle body where the disc rotor 30 is present. A flange-shaped portion 41B that stands up along the vertical wall surface 40 at the extending end of the outwardly expanding inclined surface portion 41A is provided. The flange-shaped portion 41B is on substantially the same plane as the laterally outer surface of the vehicle body of the disc rotor 30, or is located at a position protruding slightly laterally and laterally from the surface.

The presence of the cover body 4 can reduce the possibility of foreign matter such as pebbles or mud entering the space where the disc rotor 30 exists from the inside of the vehicle body beyond the existing position of the cover body 4.
If the peripheral wall surface 41 has an inclined surface portion 41A that extends outward, even if pebbles or mud enter the space where the disc rotor 30 exists from the inside of the vehicle body beyond the existence position of the cover body 4. The pebbles and mud spread outward and are guided by the inclined surface portion 41A, so that they are easily discharged outward in the radial direction.
Further, since the flange-shaped portion 41B exists at the extending end of the outwardly expanding inclined surface portion 41A, pebbles and mud are present in the space where the disc rotor 30 exists from the inside of the vehicle body beyond the existence position of the cover body 4. The possibility of getting in can be further reduced.
Further, the outwardly expanding inclined surface portion 41A and the flange-shaped portion 41B also contribute to increasing the strength of the entire cover body 4.

As shown in FIG. 4, in the positional relationship between the cover body 4 and the caliper 31, the caliper 31 is located at the circumferential end 40b of the vertical wall surface 40 of the cover 4 than at the circumferential end 41a of the peripheral wall 41. It is arranged in a state close to. As a result, a predetermined interval L1 exists in the circumferential direction of the disc rotor 30 between the circumferential end 31a of the caliper 31 and the circumferential end 41a of the peripheral wall surface 41.
Since the vertical wall surface 40 exists at the location where the predetermined interval L1 is provided, the possibility that foreign matter enters the space where the disc rotor 30 exists beyond the existing position of the cover body 4 from the inside of the vehicle body is reduced. However, since the peripheral wall surface 41 does not exist, the outer side of the disc rotor 30 in the radial direction is partially opened as shown in FIG. That is, since the predetermined interval L1 exists at a position close to the caliper 31, the heat generated in the caliper 31 and the disc rotor 30 can be easily discharged efficiently when the braking operation is performed by the caliper 31. be.

Further, since the cover body 4 is provided in almost the entire area in the circumferential direction of the disc rotor 30 except for the portion where the caliper 31 exists, when the front wheel 11 is rotating forward and when it is rotating backward. However, the function of reducing the possibility of foreign matter entering the space where the disc rotor 30 exists beyond the existing position of the cover body 4 from the inside of the vehicle body remains almost unchanged.
The cover body 4 is also provided in the space on the inner peripheral side of the rim portion 20b of the disc wheel 20.

As shown in FIGS. 5 and 6, the caliper 31 is attached to the attachment arm portion 21a of the front axle case 21 via the attachment bolt 21b. The mounting arm portion 21a supports both ends of the caliper 31 at two locations in the circumferential direction of the disc rotor 30.

As shown in FIGS. 2, 3, 5, and 6, the cover body 4 is provided at four locations in the front axle case 21 other than the mounting arm portion 21a to which the caliper 31 is attached. It is attached to the cover attachment portion 21c of. The cover mounting portion 21c is provided with through holes for inserting bolts, and the cover mounting bolts 21d are inserted into the through holes and screwed into the fixing nuts 42 provided at four points on the vertical wall surface 40 of the cover body 4. Therefore, the cover body 4 can be connected and fixed to the front axle case 21.

[1 of another embodiment]
In the above embodiment, as the caliper 31, a floating type is exemplified, but the caliper 31 is not limited to this, and for example, a fixed type may be adopted.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

[2 of another embodiment]
In the above embodiment, the caliper 31 is a hydraulically actuated type, but the caliper 31 is not limited to this, and for example, an electric cylinder may be adopted to generate a braking pressure.
For other configurations, the same configurations as those in the above-described embodiment may be adopted.

The present invention can be used not only for multipurpose vehicles but also for various work vehicles such as tractors, mowers, combines, rice transplanters, and construction machines.

4 Cover body 21 Axle support (front axle case)
24 Wheel support hub 30 Disc rotor 31 Caliper 40 Vertical wall surface 41 Circumferential wall surface

Claims (2)

A disc rotor that rotates integrally with the wheel support hub,
Calipers with brake pads are provided at positions facing both sides of the disc rotor.
A cover body for covering the disc rotor is provided at a position on the inner side of the vehicle body on the side opposite to the side where the wheel support hub is located on the disc rotor.
The cover body is provided with a vertical wall surface facing the surface of the disc rotor toward the inside of the vehicle body, and a peripheral wall surface facing the outer peripheral edge of the disc rotor from the outside in the radial direction of the disc rotor.
The vertical wall surface is composed of a flat plate-shaped member.
The peripheral wall surface is connected to the outer peripheral edge of the vertical wall surface, and extends toward the laterally outer side of the vehicle body where the disc rotor is present.
The circumferential length of the peripheral wall surface is formed shorter than the circumferential length of the outer peripheral portion of the vertical wall surface, and between the peripheral end portion of the peripheral wall surface and the circumferential end portion of the caliper. A predetermined interval in the circumferential direction of the disc rotor is provided.
Said predetermined distance, and wherein said vertical wall portion is removed the peripheral wall surface position of said cover member, and the rotation axis direction as viewed in the longitudinal wall portion of the circumferential wall has been removed wheels A braking device for a work vehicle that has an arc shape that follows the outer peripheral shape of the disc rotor, and a portion of the disc rotor that faces the outer side in the radial direction is open toward the traveling direction of the work vehicle. The caliper is fixed to an axle support to which the wheel support hub is attached.
The braking device for a work vehicle according to claim 1, wherein the cover body is fixed to the axle support at a place different from the fixing point of the caliper to the axle support.

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