JP7362513B2 - work vehicle - Google Patents

Description

The present invention relates to a work vehicle including a disc rotor and a caliper having a brake pad.

As the above-mentioned work vehicle, for example, the vehicle described in Patent Document 1 is already known. In this work vehicle ("multi-purpose vehicle" in Patent Document 1), the disc rotor contacts the hub ("wheel support hub" in Patent Document 1) from the inside in the left-right direction of the vehicle body. This disc rotor is fixed to the hub.

JP2018-91426A

In the work vehicle described in Patent Document 1, when performing work such as replacing the disc rotor, it is necessary to first remove the hub from the vehicle body, and then remove the disc rotor from the hub. That is, in the working vehicle described in Patent Document 1, the disc rotor cannot be removed while the hub remains attached to the vehicle body.

Therefore, in the work vehicle described in Patent Document 1, a relatively large amount of labor is required to remove the disc rotor.

An object of the present invention is to provide a work vehicle that facilitates the work of removing a disc rotor.

The present invention is characterized by: a wheel fixed to an axle via a hub; and a caliper having a brake pad, and the axle, the hub, the wheel, and the disc rotor are configured to rotate integrally around a rotation axis along the longitudinal direction of the axle. The caliper can press the brake pad against the disc rotor, the disc rotor can be released from being fixed to the abutting part, and the disc rotor can be released from being fixed to the abutting part. In the state where the disc rotor is rotated relative to the hub around the rotation axis, the disc rotor rotates relative to the hub around the rotation axis, thereby The posture can be changed between an attachment posture in which the disc rotor and the contact portion overlap in side view, and a removal posture in which the disk rotor and the contact portion do not overlap in side view. The wheel is fixed to the hub by a wheel fixing bolt, the disc rotor is fixed to the hub by a disc fixing bolt, and in a side view, the fastening location of the wheel fixing bolt and the disc fixing bolt are The fastening points are lined up along the radial direction of the axle and are arranged so as not to overlap with each other .

According to the present invention, by releasing the fixation of the disc rotor to the abutting part and changing the attitude of the disc rotor from the attached attitude to the detached attitude, the disc rotor becomes in a state where it does not overlap with the abutting part in a side view. In this state, by moving the disc rotor outward in the left-right direction of the machine body, the disc rotor can be removed without interfering with the contact portion.

As a result, according to the present invention, the disc rotor can be removed while the hub remains attached to the aircraft body. Therefore, according to the present invention, it is possible to realize a work vehicle that facilitates the work of removing the disc rotor.

The present invention is characterized by: a wheel fixed to an axle via a hub; and a caliper having a brake pad, and the axle, the hub, the wheel, and the disc rotor are configured to rotate integrally around a rotation axis along the longitudinal direction of the axle. The caliper can press the brake pad against the disc rotor, the disc rotor can be released from being fixed to the abutting part, and the disc rotor can be released from being fixed to the abutting part. In the state where the disc rotor is rotated relative to the hub around the rotation axis, the disc rotor rotates relative to the hub around the rotation axis, thereby The posture can be changed between an attachment posture in which the disc rotor and the contact portion overlap in side view, and a removal posture in which the disk rotor and the contact portion do not overlap in side view. The hub has a cylindrical part into which the axle is inserted, and a plurality of contact parts extending radially outward from the cylindrical part, and the disc rotor has a cylindrical part into which the axle is inserted. between the annular main body against which is pressed, the plurality of protrusions provided corresponding to the plurality of abutting parts, and the two protrusions adjacent to each other in the circumferential direction, a notch portion extending in an annular shape, the plurality of protruding portions extending radially inward from the main body portion, and the disc rotor being in the mounting position. In some cases, each of the contact portions and each of the protrusions overlap in side view, and the width of the notch in the circumferential direction is larger than the width of the protrusion in the circumferential direction.

According to this configuration, in a state where the disc rotor is fixed to the hub, the disc rotor is fixed to the plurality of contact parts. Therefore, compared to a configuration in which the disc rotor is fixed to one contact portion, the disc rotor is more likely to be fixed stably to the hub.

According to this configuration, a disc rotor having a portion against which the brake pad is pressed and a portion fixed to the hub can be realized with a relatively simple configuration. This makes it easier to suppress an increase in manufacturing costs compared to a case where the disc rotor has a relatively complicated configuration.

Furthermore, in the present invention, when the disc rotor is in the detached position, each of the abutting portions is preferably located between two of the protruding portions adjacent to each other in the circumferential direction in a side view.

According to this configuration, by rotating the disc rotor relative to the hub, each contact portion and each protrusion overlap in a side view, and each contact portion and each protrusion overlap in a side view. You can easily switch between the non-overlapping state and the non-overlapping state.

The disc rotor is in the mounting posture in a state where each contact portion and each protrusion overlap in a side view. Further, the disc rotor is in the detached position in a state where each abutting portion and each protruding portion do not overlap in side view.

Therefore, according to this configuration, it is easy to reliably realize a work vehicle in which the attitude of the disc rotor can be easily switched between the attached attitude and the detached attitude.

FIG. 3 is a left side view of the work vehicle. FIG. 3 is a cross-sectional plan view showing the configuration of a hub and the like. FIG. 3 is a left side view showing the configuration of a hub and the like. FIG. 3 is a left side view showing the configuration of a hub and the like. FIG. 3 is a cross-sectional plan view showing the configuration of a hub and the like.

Embodiments for carrying out the present invention will be described based on the drawings. In the following explanation, the direction of arrow F shown in FIGS. 1 to 5 is referred to as "front", the direction of arrow B is referred to as "rear", and the direction of arrow L shown in FIGS. 2 and 5 is referred to as "left", The direction of arrow R is assumed to be "right". Furthermore, the direction of arrow U shown in FIGS. 1, 3, and 4 is defined as "up", and the direction of arrow D is defined as "down".

[Overall configuration of work vehicle]
As shown in FIG. 1, the front portion of the vehicle body 1 is provided with left and right front wheels 2 (corresponding to “wheels” according to the present invention), the rear portion of the vehicle body 1 is provided with left and right rear wheels 3, and the center portion of the vehicle body 1 is provided with left and right front wheels 2 (corresponding to “wheels” according to the present invention). The working vehicle is equipped with a driving part A at the top, a loading platform 10 at the rear of the vehicle body 1, and a driving unit E below the loading platform 10.

This work vehicle is a four-wheel drive type that transmits the driving force from the prime mover E to the front wheels 2 and rear wheels 3, and is configured as a utility vehicle used for multi-purpose work such as agricultural work and transportation work. . The loading platform 10 can be switched to an oblique position with the front raised up by the operation of a dump cylinder (not shown), thereby making it possible to discharge the loaded object rearward by its own weight.

The driving section A includes a driver's seat 5 on which a driver is seated, a steering wheel 6 for steering the front wheels 2 in front of the driver's seat 5, and a floor 7 at the bottom.
The driving section A is provided with rope frames 8 at left and right positions of the driving section A in order to protect the driver and passengers when the vehicle body 1 falls.

[Configuration related to hub]
As shown in FIG. 2, the left front wheel 2 has a disc wheel 20. Further, the work vehicle in this embodiment includes a knuckle 21, an axle 22, a power transmission shaft 23, and a hub 24.

In addition, in the following, when it is simply described as "circumferential direction", it means "the circumferential direction of the axle 22". Moreover, when it is simply described as "radial direction", it means "the radial direction of the axle 22".

The knuckle 21 is suspended from the vehicle body 1 via a suspension mechanism (not shown). Further, the knuckle 21 has a hub mounting portion 21a. The hub mounting portion 21a has a cylindrical shape extending in the left-right direction of the machine body.

As shown in FIGS. 2 and 3, the hub 24 includes a cylindrical portion 24a and a plurality of contact portions 24b. The cylindrical portion 24a has a cylindrical shape extending in the left-right direction of the machine body. The plurality of contact portions 24b extend radially outward from the cylindrical portion 24a.

In this embodiment, the number of contact portions 24b provided is four. However, the present invention is not limited thereto, and the number of abutting portions 24b may be two or three, or five or more.

As shown in FIG. 2, a bearing 30 is inserted into the hub mounting portion 21a. The cylindrical portion 24a is inserted into the bearing 30 from the left side. Thereby, the hub 24 is supported by the hub mounting portion 21a via the bearing 30.

Furthermore, both the axle 22 and the transmission shaft 23 extend in the left-right direction of the machine body. The transmission shaft 23 extends to the left from a front differential device (not shown). The left end of the transmission shaft 23 is connected to the right end of the axle 22 via a ball joint (not shown). Note that the driving force from the driving portion E is transmitted to the power transmission shaft 23 via the front differential device.

The axle 22 is inserted into the cylindrical portion 24a.

As described above, the hub 24 includes a cylindrical portion 24a into which the axle 22 is inserted, and a plurality of contact portions 24b extending radially outward from the cylindrical portion 24a.

A fixing nut 25, a spring washer 26, and a washer 27 are attached to the left end of the axle 22 in this order from the left side. The washer 27 is in contact with the left end of the hub 24. Further, the spring washer 26 is sandwiched between the fixing nut 25 and the washer 27. The hub 24 is fixed to the axle 22 by tightening the fixing nut 25.

Here, the outer circumferential surface of the axle 22 and the inner circumferential surface of the cylindrical portion 24a have a spline structure that meshes with each other. Thereby, the axle 22 and the hub 24 rotate integrally around the rotation axis P along the longitudinal direction of the axle 22.

Further, the disc wheel 20 is fastened to the left end portion of the hub 24 with a plurality of fixing bolts 28. With this configuration, the left front wheel 2 is fixed to the axle 22 via the hub 24.

The work vehicle thus includes a left front wheel 2 fixed to an axle 22 via a hub 24.

With the configuration described above, the driving force from the driving unit E is transmitted to the axle 22 via the transmission shaft 23. Then, the axle 22, the hub 24, and the left front wheel 2 rotate integrally around the rotation axis P.

[Configuration related to disc rotor]
As shown in FIG. 2, the work vehicle in this embodiment includes a disc rotor 31, a caliper 32, and a cover 33.

As shown in FIGS. 2 to 4, the disc rotor 31 has an annular main body portion 31a and a plurality of protrusions 31b. The plurality of protrusions 31b are provided extending radially inward from the main body 31a.

In addition, in this embodiment, the number of protrusions 31b provided is four. However, the present invention is not limited thereto, and the number of protrusions 31b may be two or three, or five or more. Further, the number of protrusions 31b provided may be the same as or different from the number of abutting portions 24b provided.

The plurality of protruding parts 31b are provided in a state corresponding to the plurality of abutting parts 24b. Further, as shown in FIGS. 2 and 3, the protruding portions 31b are respectively in contact with the abutting portions 24b from the right side. The protruding parts 31b are each fixed to the abutting parts 24b.

To be more specific, a first bolt hole 24c is formed in the contact portion 24b. Further, a second bolt hole 31c is formed in the protrusion 31b. The disk fixing bolt 40 is inserted into the first bolt hole 24c and the second bolt hole 31c with the first bolt hole 24c and the second bolt hole 31c communicating with each other. The protruding portion 31b is fastened to the abutting portion 24b by a disk fixing bolt 40.

With this configuration, the disc rotor 31 contacts the contact portion 24b of the hub 24 from the right side with respect to the hub 24. Further, the disc rotor 31 is fixed to the abutting portion 24b.

In this manner, the working vehicle is provided with the disc rotor 31 that is in contact with the abutting portion 24b of the hub 24 from the inside in the left-right direction of the body and is fixed to the abutting portion 24b.

With the configuration described above, in the work vehicle of this embodiment, the axle 22, the hub 24, the left front wheel 2, and the disc rotor 31 rotate integrally around the rotation axis P along the longitudinal direction of the axle 22. It is configured as follows.

Further, as shown in FIG. 2, the caliper 32 is attached to the knuckle 21. Moreover, the caliper 32 has a pair of brake pads 32a.

In this way, the work vehicle is equipped with a caliper 32 having a brake pad 32a.

The main body portion 31a of the disc rotor 31 is located between a pair of brake pads 32a. The caliper 32 can press the pair of brake pads 32a against the main body 31a with the main body 31a sandwiched between the pair of brake pads 32a. That is, the brake pad 32a is pressed against the main body portion 31a.

In this way, the caliper 32 can press the brake pad 32a against the disc rotor 31. Further, the disc rotor 31 includes an annular main body portion 31a against which the brake pad 32a is pressed, and a plurality of protrusions 31b provided in a state corresponding to the plurality of abutting portions 24b.

The caliper 32 is operated in response to operation of a brake pedal (not shown) provided in the driving section A shown in FIG. When the driver depresses the brake pedal, the caliper 32 presses the pair of brake pads 32a against the main body 31a. As a result, a braking force is applied to the left front wheel 2.

Further, the cover 33 shown in FIG. 2 is attached to the knuckle 21. The cover 33 covers the disc rotor 31 from the right side.

[About disc rotor removal]
By removing the disk fixing bolt 40, the disk rotor 31 is released from being fixed to the abutment portion 24b. That is, the fixation of the disc rotor 31 to the abutment portion 24b can be released.

As shown in FIGS. 3 and 4, when the disk rotor 31 is released from the abutment portion 24b, the disk rotor 31 can rotate relative to the hub 24 around the rotation axis P. be.

The disk rotor 31 can change its posture between the posture shown in FIG. 3 and the posture shown in FIG. 4 by rotating relative to the hub 24 around the rotation axis P.

In the state shown in FIG. 3, the disc rotor 31 is in the attached position. The mounting posture is a posture in which the disc rotor 31 and the contact portion 24b overlap in side view. In this embodiment, when the disc rotor 31 is in the attached position, each contact portion 24b and each protrusion portion 31b overlap in side view.

In the state shown in FIG. 4, the disc rotor 31 is in the detached position. The detached posture is a posture in which the disc rotor 31 and the contact portion 24b do not overlap in side view. In this embodiment, when the disc rotor 31 is in the detached position, each contact portion 24b is located between two protrusions 31b adjacent to each other in the circumferential direction in a side view.

In this way, the disc rotor 31 rotates relative to the hub 24 around the rotation axis P, so that the disc rotor 31 can be placed in the mounting position in which the disc rotor 31 and the contact portion 24b overlap in the side view, and in the mounting position in the side view. The posture can be changed between a detached posture in which the disc rotor 31 and the contact portion 24b do not overlap.

As shown in FIG. 5, when the disc rotor 31 is in the removal position, the disc rotor 31 is removed by moving the disc rotor 31 to the left while the hub 24 remains fixed to the axle 22. be able to.

Further, the installation work of the disc rotor 31 is performed as follows. That is, with the disc rotor 31 in the removed position, the disc rotor 31 is moved to the right so that the hub 24 passes through the opening of the disc rotor 31, and the disc rotor 31 is moved around the rotation axis P relative to the hub 24. By relatively rotating the disc rotor 31, the disc rotor 31 can be placed in the installed position. In this state, the disc rotor 31 can be attached to the hub 24 by fastening the protruding part 31b to the abutting part 24b with the disc fixing bolt 40.

Although the left front wheel 2 and its surrounding configuration have been described above, the right front wheel 2, left rear wheel 3, and right rear wheel 3 are also similar to the above description.

With the configuration described above, by releasing the fixation of the disc rotor 31 to the abutting part 24b and changing the attitude of the disc rotor 31 from the attached attitude to the detached attitude, the disc rotor 31 can be moved to the abutting part in a side view. 24b. In this state, by moving the disc rotor 31 outward in the left-right direction of the machine body, the disc rotor 31 can be removed without the disc rotor 31 interfering with the abutting portion 24b.

As a result, with the configuration described above, the disc rotor 31 can be removed while the hub 24 remains attached to the aircraft body. Therefore, according to the configuration described above, it is possible to realize a work vehicle in which the work of removing the disc rotor 31 is easy.

Note that the embodiment described above is merely an example, and the present invention is not limited thereto, and can be modified as appropriate.

[Other embodiments]
(1) The number of contact portions 24b that the hub 24 has may be one.

(2) The structure for fixing the hub 24 to the axle 22 may not be the structure in the above embodiment. For example, the hub 24 may be fixed to the axle 22 by welding, or the axle 22 and the hub 24 may be integrally formed.

(3) The cover 33 may not be provided.

(4) As long as the fixation of the disc rotor 31 to the abutting part 24b can be released, the structure for fixing the disc rotor 31 to the abutting part 24b does not have to be the structure in the above embodiment.

(5) The work vehicle may be of a two-wheel drive type. In this case, the driving force from the driving portion E may be transmitted only to the front wheel 2 of the front wheels 2 and the rear wheels 3, or may be transmitted only to the rear wheels 3.

(6) The number of protrusions 31b that the disc rotor 31 has may be one.

(7) The hub 24 does not need to have the cylindrical portion 24a.

(8) The hub 24 and disc rotor 31 corresponding to the left and right front wheels 2 may not be provided, but the hub 24 and disc rotor 31 corresponding to the left and right rear wheels 3 may be provided. Further, the hub 24 and disc rotor 31 corresponding to the left and right rear wheels 3 may not be provided, but the hub 24 and disc rotor 31 corresponding to the left and right front wheels 2 may be provided.

The present invention can be used not only for utility vehicles but also for self-retracting combine harvesters, ordinary combine harvesters, corn harvesters, rice transplanters, tractors, and the like.

2 Front wheel (wheel)
22 Axle 24 Hub 24a Cylindrical part 24b Contact part 31 Disc rotor 31a Main body part 31b Projection part 32 Caliper 32a Brake pad P Rotating shaft center

Claims (3)

a wheel fixed to an axle via a hub;
a disc rotor that is in contact with an abutting portion of the hub from the inside in the left-right direction of the aircraft body, and is fixed to the abutting portion;
a caliper having a brake pad;
The axle, the hub, the wheel, and the disc rotor are configured to rotate integrally around a rotation axis along the longitudinal direction of the axle,
The caliper is capable of pressing the brake pad against the disc rotor,
The fixation of the disc rotor to the abutting portion is releasable;
In a state where the disc rotor is released from being fixed to the abutting portion, the disc rotor is rotatable relative to the hub around the rotation axis,
The disc rotor rotates relative to the hub around the rotation axis, so that the disc rotor can be mounted in a mounting position in which the disc rotor and the contact portion overlap in a side view, and a mounting position in which the disc rotor and the contact portion overlap in a side view. and a removal posture in which the contact portion and the contact portion do not overlap;
the wheel is fixed to the hub by a wheel fixing bolt;
the disc rotor is fixed to the hub by a disc fixing bolt;
When viewed from the side, a fastening location of the wheel fixing bolt and a fastening location of the disc fixing bolt are arranged along the radial direction of the axle and are arranged so as not to overlap with each other. a wheel fixed to an axle via a hub;
a disc rotor that is in contact with an abutting portion of the hub from the inside in the left-right direction of the aircraft body, and is fixed to the abutting portion;
a caliper having a brake pad;
The axle, the hub, the wheel, and the disc rotor are configured to rotate integrally around a rotation axis along the longitudinal direction of the axle,
The caliper is capable of pressing the brake pad against the disc rotor,
The fixation of the disc rotor to the abutting portion is releasable;
In a state in which the disc rotor is released from being fixed to the abutting portion, the disc rotor is rotatable relative to the hub around the rotation axis,
The disc rotor rotates relative to the hub around the rotation axis, so that the disc rotor can be mounted in a mounting position in which the disc rotor and the contact portion overlap in a side view, and a mounting position in which the disc rotor and the contact portion overlap in a side view. and a removal posture in which the contact portion and the contact portion do not overlap;
The hub has a cylindrical portion into which the axle is inserted, and a plurality of contact portions extending radially outward from the cylindrical portion,
The disc rotor includes an annular main body portion against which the brake pad is pressed, a plurality of protrusions provided corresponding to the plurality of contact portions, and two protrusions adjacent to each other in the circumferential direction. In between, it has a notch part extending in a shape along the annular shape of the main body part,
The plurality of protrusions are provided to extend radially inward from the main body,
When the disc rotor is in the mounting posture, each of the contact portions and each of the protrusion portions overlap in side view,
In the working vehicle , the width of the notch in the circumferential direction is larger than the width of the protrusion in the circumferential direction . 3. The work vehicle according to claim 2 , wherein when the disc rotor is in the detached position, each of the abutting portions is located between two of the protruding portions adjacent to each other in the circumferential direction in a side view.

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