JP6928578B2 - Work platform - Google Patents

Description

The present invention relates to a technique for a work vehicle including a plurality of brake pedals.

Conventionally, the technique of a work vehicle provided with a plurality of brake pedals has been known. For example, as described in Patent Document 1.

Patent Document 1 includes a left brake pedal that operates a left brake capable of braking the left rear wheel, and a right brake pedal that operates a right brake capable of braking the right rear wheel. The car is listed. By operating the steering wheel to the one side while depressing one of the left and right brake pedals, the aircraft can be turned in a small turn.

Further, the work vehicle described in Patent Document 1 is provided with a connecting portion for connecting the left and right brake pedals. By sliding the connecting part in the left-right direction, it is possible to switch between a connected state in which the left and right brake pedal arm parts (the part connecting the swing shaft and the tread surface) are connected to each other and a non-connected state in which the connection is released. be able to.

For example, when it is necessary to turn the machine in a small turn, such as during work, the left and right brake pedals can be operated independently by operating the connecting portion to switch to the non-connected state. Further, when it is not necessary to turn the aircraft in a small turn such as when traveling on a road, the left and right brake pedals can be interlocked and the left and right rear wheels can be braked at the same time by operating the connecting portion to switch to the connected state.

Here, in general, the shape of the brake pedal (particularly, the arm portion connecting the swing shaft and the tread surface) can be appropriately changed depending on various circumstances. For example, the gap (interval) between the left and right arm portions may be widened due to design reasons (to avoid interference with other members, etc.).

As described above, when the distance between the left and right arm portions becomes wide, it is necessary to increase the length of the connecting portion connecting the arm portions according to the distance. However, it is disadvantageous in that the longer the length of the connecting portion, the larger the load applied to the connecting portion.

Japanese Unexamined Patent Publication No. 2014-31117

The present invention has been made in view of the above circumstances, and the problem to be solved is to provide a work vehicle capable of reducing the load applied to the connecting portion.

The problem to be solved by the present invention is as described above, and next, the means for solving this problem will be described.

That is, in claim 1, the first central portion rotatably supported with respect to the pedal rotation shaft, the first arm portion formed so as to extend radially from the first central portion, and the first arm portion. A first brake pedal provided on the first arm portion and having a first stepping portion that can be stepped on, a second central portion rotatably supported with respect to the pedal rotation shaft, and the second central portion. A second arm portion formed so as to extend in the radial direction from the second arm portion, a second step portion provided on the second arm portion and capable of depressing operation, and the second arm portion in the axial direction of the pedal rotation shaft. A second brake pedal having a connected portion formed on the first brake pedal side and extending radially from the second central portion, and a second brake pedal provided on the first arm portion. It is provided with a connecting portion that can be moved between a brake connecting position that is engaged with the connected portion and a brake connection releasing position that is disengaged from the connected portion.

In claim 2, the second brake pedal is formed between the second arm portion and the connected portion in the axial direction of the pedal rotation shaft, and is formed in the radial direction from the second central portion. It is further provided with a first link connecting portion which is formed so as to extend and is connected to a first link member connected to the braking device.

In claim 3, the connected portion is a connecting arm portion formed so as to extend radially from the second central portion, and a shaft of the pedal rotation shaft among the side surfaces of the connecting arm portion. It is provided with an engaging portion which is fixed to the side surface on the side of the first brake pedal in the direction and in which the connecting portion can be engaged.

The fourth aspect of the present invention further includes a parking brake mechanism that holds the first brake pedal and the second brake pedal at a position where they are depressed, and the parking brake mechanism includes an operable operation unit and the operation unit. Is operated, and by engaging with at least one of the first brake pedal and the second brake pedal, the rotation of the first brake pedal or the second brake pedal is restricted. The rotation restricting portion is arranged at the same position as the engaging portion in the axial direction of the pedal rotation shaft and at a position different from the engaging portion in the radial direction of the pedal rotation shaft, and the operating portion operates. Along with this, it is provided with a connection release restricting unit that regulates the movement of the connection portion to the brake connection release position.

In claim 5, the engaging portion is arranged outside the disconnection restricting portion in the radial direction of the pedal rotation shaft.

In claim 6, the second brake pedal further includes a first reinforcing portion provided so as to connect the second arm portion and the connected portion.

In claim 7, the connecting portion is provided so as to be swingable with respect to the first arm portion via a connecting portion rotating shaft provided non-parallel to the pedal rotating shaft, and the connecting portion rotates. By swinging around the moving shaft, the vehicle moves to the brake connection position or the brake connection release position.

In claim 8, the connecting portion is arranged on one side in the rotation direction of the first arm portion, and at the brake connecting position, the connected portion with respect to the first arm portion is arranged on the one side in the rotation direction. The first rotation restricting portion capable of regulating relative rotation and the rotation of the connected portion with respect to the first arm portion at the brake connecting position, which is arranged on the other side of the rotation direction of the first arm portion. On the side opposite to the connected portion with the first arm portion sandwiched between the second rotation restricting portion capable of restricting the relative rotation to the other side in the moving direction, the first rotation restricting portion and the said It is provided with a restricting portion connecting portion for connecting the second rotation restricting portion.

In claim 9, the connecting portion includes a first connecting restricting portion extending from an end of the first rotation restricting portion on the side to be connected to one side in the rotating direction, and the second connecting portion. It further includes a second connection restricting portion extending from the end of the rotation restricting portion on the side to be connected to the other side in the rotation direction.

In claim 10, the connecting portion connects at least one of the first rotation regulating portion and the first connecting regulating portion, or the second rotation regulating portion and the second connecting regulating portion. It further includes a second reinforcing portion provided.

In claim 11, the second reinforcing portion, together with at least one of the first rotation restricting portion and the first connection regulating portion, or the second rotation regulating portion and the second connecting regulating portion, is omitted. It is provided so as to form a rectangular frame.

In claim 12, the connecting portion is provided in the second reinforcing portion, and a second link member connected to a release operating tool for moving the connecting portion to the brake connection release position is connected. It further includes a second link connecting portion.

As the effect of the present invention, the following effects are exhibited.

In claim 1, since the connecting portion is connected to the connected portion arranged at a position closer to the first brake pedal (first arm portion) than the second arm portion of the second brake pedal, the connecting portion is connected to the connecting portion. The applied load can be reduced. Along with this, it is possible to reduce the size and cost of the connecting portion.

In claim 2, by connecting the first link member to the first link connecting portion provided between the second arm portion and the connected portion, the first link member and the second arm portion or the connected portion are connected. It is possible to easily avoid interference with the unit.

In claim 3, since the connecting portion is connected to the engaging portion fixed to the side surface of the connecting arm portion on the first brake pedal side (the side surface close to the first brake pedal), the load applied to the connecting portion is increased. Can be reduced. Further, the space on the first brake pedal side of the connecting arm portion (the space between the connecting arm portion and the first brake pedal, which is not provided with the engaging portion) is used as the arrangement of other members. It can be effectively used for this purpose.

In claim 4, the space on the first brake pedal side of the connecting arm portion (the space between the connecting arm portion and the first brake pedal and in which the engaging portion is not provided) is regulated to release the connection. It can be effectively used for the arrangement of departments.

In claim 5, by arranging the engaging portion radially outside the coupling disengagement restricting portion, the engaging portion can be engaged with the connecting portion at a position relatively far from the pedal rotation shaft. As a result, when the connecting portion is engaged with the connected portion, the load applied to the connecting portion can be suppressed to be relatively small.

In claim 6, the strength of the second brake pedal (second arm portion and connected portion) can be improved.

In claim 7, the first brake pedal and the second brake pedal can be connected or disconnected by a simple operation (swing operation).

In claim 8, the first brake pedal and the second brake pedal can be connected with a simple configuration.

In claim 9, when the positions of the first brake pedal and the second brake pedal are misaligned (for example, one of them is being operated), the first connection regulation unit or the second connection regulation unit is the first. (Ii) By contacting with the brake pedal (connected portion), it is possible to prevent the connecting portion from moving to the brake connecting position.

In claim 10, the strength of the connecting portion can be improved.

In claim 11, the strength of the connecting portion can be improved.

In claim 12, the strength of the connecting portion can be improved by receiving the operating load when moving the connecting portion to the brake connection release position by the reinforcing portion.

The right side view which showed the overall structure of the tractor which concerns on one Embodiment of this invention. Right rear perspective view showing the operation tool of the tractor. Right rear perspective view showing how the tractor operating tool is provided on the operating tool bracket. Similarly, the right side view. An exploded right rear perspective view of the left brake pedal, the right brake pedal, and the like. Right rear perspective view of the pedal rotation shaft and the clutch pedal. Right rear perspective view of the left brake pedal, the right brake pedal and the connecting portion. Left rear perspective view of the left brake pedal and the right brake pedal. The rear view which showed the appearance that the left brake pedal etc. were provided in the operation tool bracket. Similarly, the front view. (A) The figure which showed the wire support part seen from one direction. (B) The figure which showed the wire support part seen from the axial direction of a wire. (A) Right rear perspective view showing the connecting portion. (B) Similarly, a left front perspective view. Similarly, a plan view. Left front perspective view showing the parking brake mechanism. Left side view showing the left brake pedal and the like. (A) A plan view showing a state in which the connecting portion is in the brake connecting position. (B) A plan view showing a state in which the connecting portion is in the brake connection release position. The back of the left brake pedal, etc., showing the state where the connection part is in the brake connection release position.

In the following, the directions indicated by the arrows U, D, arrow F, arrow B, arrow L, and arrow R in the figure are defined as upward, downward, forward, backward, leftward, and rightward, respectively. I will explain.

First, with reference to FIG. 1, the overall configuration of the tractor 1 according to the embodiment of the work vehicle will be described.

The tractor 1 mainly includes a body frame 2, front wheels 3, rear wheels 4, an engine 5, a bonnet 6, a transmission 7, a steering wheel 8, and a seat 9.

The airframe frame 2 is arranged with its longitudinal direction facing the front-rear direction. The front portion of the fuselage frame 2 is supported by a pair of left and right front wheels 3 via a front axle mechanism (not shown). A transmission 7 is provided at the rear of the fuselage frame 2. The rear portion of the transmission 7 is supported by a pair of left and right rear wheels 4 via a rear axle mechanism (not shown). An engine 5 (diesel engine) is provided in the middle of the front and rear of the fuselage frame 2. The engine 5 is covered with a bonnet 6. Behind the engine 5, a driving operation unit having a steering wheel 8, various operating tools, a seat 9, and the like is provided.

After the power is changed by the transmission 7, the power of the engine 5 can be transmitted to the front wheels 3 via the front axle mechanism and can be transmitted to the rear wheels 4 via the rear axle mechanism. The front wheels 3 and the rear wheels 4 are rotationally driven by the power of the engine 5, and the tractor 1 travels. The steering wheel 8 can steer the tractor 1 by adjusting (changing) the turning angle of the pair of left and right front wheels 3 according to the amount of rotation operation thereof.

Next, with reference to FIGS. 2 to 4, the outline of various operating tools arranged below the steering wheel 8 will be described.

An operating tool bracket 11 for supporting various operating tools is provided on the back surface (rear surface) of the partition plate 10 that divides the internal space of the bonnet 6 and the space on the seat 9 side. The operating tool bracket 11 is formed by using a plurality of plate-shaped members, tubular members, and the like.

A steering post 20 is provided at the center of the left and right of the operating tool bracket 11 so as to be able to rotate (swing) up and down. A steering wheel 8 is provided at the upper end of the steering post 20.

A pedal rotation shaft 30 whose axial direction is directed to the left and right is provided on the upper portion of the operating tool bracket 11. A clutch pedal 40 is rotatably provided near the left end of the pedal rotation shaft 30. A left brake pedal 50 and a right brake pedal 70 are rotatably provided in the vicinity of the right end portion of the pedal rotation shaft 30. Further, the left brake pedal 50 is provided with a connecting portion 90 that connects the left brake pedal 50 and the right brake pedal 70 so as to be integrally rotatable.

A parking brake rotation shaft 110 whose axial direction is directed to the left and right is provided in the upper and lower halfway portion of the operation tool bracket 11 (below the pedal rotation shaft 30). The parking brake rotation shaft 110 is provided with a parking brake mechanism 120 that holds the left brake pedal 50 and the right brake pedal 70 at the depressed position.

A tilt pedal 130 is rotatably provided at the center of the left and right sides of the operating tool bracket 11 (on the right side of the steering post 20). The steering post 20 can be rotated by depressing the tilt pedal 130. Further, a brake connection release pedal 140 is provided at the center of the left and right sides of the operation tool bracket 11 (on the left side of the steering post 20). By depressing the brake connection release pedal 140, the connection between the left brake pedal 50 and the right brake pedal 70 by the connection portion 90 can be released. The brake connection release pedal 140 can be folded and can be stored when not in use. 2 to 4 show the brake disconnection pedal 140 in the folded state.

Next, the configuration of the left brake pedal 50 and the right brake pedal 60, which are the main parts of the present invention, will be described in more detail. Specifically, the configuration of the pedal rotation shaft 30, the left brake pedal 50, the right brake pedal 70, the connecting portion 90, the parking brake rotation shaft 110, the parking brake mechanism 120, the brake detection sensor 150, and the parking brake detection sensor 160. This will be described in detail.

The pedal rotation shaft 30 shown in FIGS. 5 and 6 rotatably supports the clutch pedal 40, the left brake pedal 50, and the right brake pedal 60. The pedal rotation shaft 30 is formed in a substantially columnar shape. The pedal rotation shaft 30 is rotatably supported by the operating tool bracket 11 with the axial direction oriented to the left and right. The pedal rotation shaft 30 is provided with a link connecting portion 31.

The link connecting portion 31 is a portion connected to a link member (not shown) that transmits the movement (rotational movement) of the left brake pedal 50 to the braking device of the rear wheel 4 (rear wheel 4 on the left side). The link connecting portion 31 is formed of a plate material. The link connecting portion 31 is provided so as to project forward from the left end portion of the pedal rotation shaft 30.

The left brake pedal 50 shown in FIGS. 5 and 7 to 10 is an operating tool for braking the left rear wheel 4 of the tractor 1. The left brake pedal 50 mainly includes a central portion 51, an arm portion 52, a stepping portion 53, a detected portion 54, a toothed portion 55, a wire supporting portion 56, a connecting portion supporting portion 57, and a return spring locking portion 58.

The central portion 51 is a portion that serves as the rotation center of the left brake pedal 50. The central portion 51 is formed in a substantially cylindrical shape with the axial direction directed to the left and right.

The arm portion 52 is a portion formed so as to extend from the central portion 51 in the radial direction of the central portion 51. One end (upper end) of the arm portion 52 is fixed to the lower portion of the outer peripheral surface of the central portion 51. The arm portion 52 is formed of a plate material having a linear portion extending downward from the central portion 51 and a linear portion extending rearward and downward from the lower end of the portion in a side view. As a result, the arm portion 52 is formed in a substantially L-shape in side view.

The stepping portion 53 is a portion where the operator on the tractor 1 steps on when operating the left brake pedal 50. The stepping portion 53 is formed in a substantially rectangular plate shape. The stepping portion 53 is fixed to the other end (lower end) of the arm portion 52.

The detected portion 54 is a portion for detecting the position of the left brake pedal 50 by the brake detection sensor 150 described later. The detected portion 54 is provided in the middle of the upper and lower parts of the arm portion 52. The detected portion 54 is provided so as to project rearward from the arm portion 52 with the plate surface facing rear and upward.

The toothed portion 55 is a portion for restricting the rotation of the left brake pedal 50 by engaging with the parking brake mechanism 120 described later. A plurality of teeth arranged in front and back are formed in the tooth joint portion 55. The toothed portion 55 is fixed to the left side surface of the arm portion 52 below the detected portion 54.

The wire support portion 56 shown in FIGS. 8 and 11 is a portion that supports the wire 141 that connects the connecting portion 90 and the brake connection release pedal 140, which will be described later. The wire support portion 56 mainly includes a plate-shaped portion 56a, a holding portion 56b, and a locking portion 56c.

The plate-shaped portion 56a is a portion formed by bending a substantially rectangular plate material into a substantially L-shape. One end of the plate-shaped portion 56a is fixed to the left side surface of the arm portion 52 below the toothed portion 55. The plate-shaped portion 56a is provided so as to extend to the left front from the arm portion 52. A notch 56d is formed in the vicinity of the front end of the plate-shaped portion 56a. The cutout portion 56d is formed so as to cut out the upper portion of the plate-shaped portion 56a downward.

The sandwiching portion 56b is a plate-shaped portion arranged so as to face the plate-shaped portion 56a. The sandwiching portion 56b is fixed to the plate-shaped portion 56a so as to face the front end portion (the portion where the cutout portion 56d is formed) of the plate-shaped portion 56a with a slight gap. A notch 56e is formed in the sandwiching portion 56b. The cutout portion 56e is formed so as to cut out the upper portion of the holding portion 56b downward. The notch 56e is formed in a substantially rectangular shape in a lateral view.

The locking portion 56c is a portion in which the return spring 99a for urging the connecting portion 90, which will be described later, is locked. The locking portion 56c is formed in the front halfway portion of the plate-shaped portion 56a.

As shown in FIG. 11, the wire 141 is inserted through the notch 56d and the notch 56e. The wire 141 is fixed to the wire support portion 56 by sandwiching the plate-shaped portion 56a between the nuts 141a and the nuts 141b provided on the wire 141.

Here, the notch portion 56e is formed in a substantially rectangular shape. Therefore, the rotation of the nut 141b can be restricted by bringing the side surfaces of the nut 141b and the side surfaces (planes) of the notch 56e into contact with each other. Therefore, by tightening only one nut 141a, the plate-shaped portion 56a can be sandwiched between the other nut 141b and the wire 141 can be easily fixed to the wire support portion 56.

The connecting portion supporting portion 57 shown in FIGS. 7 and 8 is a portion for supporting the connecting portion 90. The connecting portion support portion 57 is formed by fixing a cylindrical member whose axial direction is directed back and forth to the left side surface of the arm portion 52. The connecting portion supporting portion 57 is provided below the wire supporting portion 56.

The return spring locking portion 58 shown in FIGS. 7 to 10 is a portion in which a return spring (not shown) that urges the left brake pedal 50 to rotate toward the initial position is locked. The initial position of the left brake pedal 50 is a position in a state where the left brake pedal 50 is not operated, and is a position where the left brake pedal 50 is rotated to the maximum clockwise in the right side view. The return spring locking portion 58 is formed of a plate material. The return spring locking portion 58 is fixed to the front upper portion of the outer peripheral surface of the central portion 51. The return spring locking portion 58 is provided so as to extend forward and upward from the left end portion of the central portion 51.

As shown in FIGS. 3 and 4, the left brake pedal 50 is arranged on the right side of the steering post 20, and the central portion 51 is inserted through the pedal rotation shaft 30. The central portion 51 and the pedal rotation shaft 30 are fixed so as to be integrally rotatable by a fixing member such as a pin.

One end of the return spring is locked to the return spring locking portion 58. The other end of the return spring is appropriately locked to the operating tool bracket 11. The urging force of the return spring always urges the left brake pedal 50 clockwise when viewed from the right side.

The right brake pedal 70 shown in FIGS. 5 and 7 to 10 is an operating tool for braking the right rear wheel 4 of the tractor 1. The right brake pedal 70 mainly includes a central portion 71, an arm portion 72, a stepping portion 73, a detected portion 74, a connected portion 75, a reinforcing portion 76, a link connecting portion 77, and a return spring locking portion 78.

The central portion 71 is a portion that serves as the rotation center of the right brake pedal 70. The central portion 71 is formed in a substantially cylindrical shape with the axial direction directed to the left and right.

The arm portion 72 is a portion formed so as to extend from the central portion 71 in the radial direction of the central portion 71. One end (upper end) of the arm portion 72 is fixed to the lower portion of the outer peripheral surface of the central portion 71. The arm portion 72 is formed of a plate material having a linear portion extending downward from the central portion 71 and a linear portion extending rearwardly and downwardly from the lower end of the portion in a side view. As a result, the arm portion 72 is formed in a substantially L-shape in side view. The arm portion 72 is formed so as to have substantially the same shape as the arm portion 52 of the left brake pedal 50 in a side view. The arm portion 72 is provided near the right end portion of the central portion 71. The arm portion 72 is formed so that the lower portion bulges outward (right side) with respect to the upper portion by being bent in the middle of the upper and lower parts.

The stepping portion 73 is a portion where the operator on the tractor 1 steps on when operating the right brake pedal 70. The stepping portion 73 is formed in a substantially rectangular plate shape. The stepping portion 73 is fixed to the other end (lower end) of the arm portion 72.

The detected portion 74 is a portion for detecting the position of the right brake pedal 70 by the brake detection sensor 150 described later. The detected portion 74 is provided in the middle of the upper and lower parts of the arm portion 752. The detected portion 74 is provided so as to project rearward from the arm portion 72 with the plate surface facing rear and upward.

The connected portion 75 is a portion to be connected to the connecting portion 90 described later. The connected portion 75 mainly includes a connecting arm portion 75a and an engaging portion 75b.

The connecting arm portion 75a is a portion formed so as to extend from the central portion 71 in the radial direction of the central portion 71. One end (upper end) of the connecting arm portion 75a is fixed to the lower portion of the outer peripheral surface of the central portion 71. The connecting arm portion 75a is formed of a plate material extending linearly downward from the central portion 71 in a side view. As a result, the connecting arm portion 75a is formed so as to have substantially the same shape as the upper portion of the arm portion 72 in the side view and to overlap the arm portion 72. The connecting arm portion 75a is provided near the left end portion of the central portion 71 (on the left side of the arm portion 72). That is, the connecting arm portion 75a is arranged at a position closer to the left brake pedal 50 than the arm portion 72.

The engaging portion 75b is a portion to which the connecting portion 90 described later is engaged. The engaging portion 75b is formed of a plate material having a substantially rectangular shape in a side view. The front-rear width of the engaging portion 75b is formed to be larger than the front-rear width of the connecting arm portion 75a. The engaging portion 75b is fixed to the left side surface (side surface on the left brake pedal 50 side) of the lower end portion of the connecting arm portion 75a. The engaging portion 75b is arranged so as to project forward and backward from the connecting arm portion 75a in a side view. In the engaging portion 75b, the distance from the pedal rotating shaft 30 (the radial position centered on the pedal rotating shaft 30) is the distance from the pedal rotating shaft 30 to the connecting portion supporting portion 57 of the left brake pedal 50. Arranged so that they roughly match.

The reinforcing portion 76 is a portion that connects the arm portion 72 and the connecting arm portion 75a. The reinforcing portion 76 is formed of a plate material. The reinforcing portion 76 is arranged so that the plate surface is substantially perpendicular to the radial direction of the central portion 71. The reinforcing portion 76 is fixed to the arm portion 72 and the connecting arm portion 75a so as to connect the vicinity of the upper end portion of the left side surface of the arm portion 72 and the vicinity of the upper end portion of the right side surface of the connecting arm portion 75a.

The link connecting portion 77 is a portion connected to a link member 77b (see FIG. 10) that transmits the movement (rotational movement) of the right brake pedal 70 to the braking device of the rear wheel 4 (right rear wheel 4). .. The link connecting portion 77 is formed of a plate material. The link connecting portion 77 is arranged between the arm portion 72 and the connecting arm portion 75a in the left-right direction (axial direction of the central portion 71). The link connecting portion 77 is fixed to the front lower portion of the outer peripheral surface of the central portion 71. The link connecting portion 77 is formed so as to extend from the central portion 71 in the radial direction of the central portion 71. The link connecting portion 77 is connected to the link member 77b via a pin 77a (see FIG. 10).

The return spring locking portion 78 is a portion in which a return spring (not shown) that urges the right brake pedal 70 to rotate toward the initial position is locked. The initial position of the right brake pedal 70 is a position in a state where the right brake pedal 70 is not operated, and is a position where the right brake pedal 70 is rotated to the maximum clockwise in the right side view. The return spring locking portion 78 is formed by appropriately bending a plate material. The return spring locking portion 78 is fixed to the front upper portion of the outer peripheral surface of the central portion 71. The return spring locking portion 78 is provided at the left end portion of the central portion 71.

As shown in FIGS. 3 and 4, the right brake pedal 70 is arranged on the right side of the left brake pedal 50, and the central portion 71 is inserted through the pedal rotation shaft 30. The central portion 71 is supported by the pedal rotation shaft 30 so as to be rotatable.

One end of the return spring is locked to the return spring locking portion 78. The other end of the return spring is appropriately locked to the operating tool bracket 11. The right brake pedal 70 is constantly urged clockwise when viewed from the right side by the urging force of the return spring.

The connecting portion 90 shown in FIGS. 5, 7, 9 and 10 connects the left brake pedal 50 and the right brake pedal 70 so that the left brake pedal 50 and the right brake pedal 70 can be integrally rotated. Is what you do. The connecting portion 90 mainly includes a regulating portion connecting portion 91, a front rotation regulating portion 92, a front side connecting regulating portion 93, a rear side rotation regulating portion 94, a rear side connecting regulating portion 95, a reinforcing portion 96, a wire connecting portion 97, and the like. It includes a contact portion 98 and a return spring locking portion 99.

The restricting portion connecting portion 91 shown in FIGS. 12 and 13 is a portion that connects the front rotation regulating portion 92 and the rear rotation restricting portion 94, which will be described later. The regulating portion connecting portion 91 is formed in a plate shape with the plate surface facing left and right. The regulating portion connecting portion 91 is formed so as to extend in the front-rear direction.

The front rotation restricting unit 92 is a portion that restricts the right brake pedal 70 from rotating forward relative to the left brake pedal 50. The front rotation restricting portion 92 is formed in a plate shape with the plate surface facing back and forth. The front rotation restricting portion 92 is formed so as to extend to the right from the front end of the restricting portion connecting portion 91.

The front side connection restricting portion 93 is a portion that prevents (regulates) the connecting portion 90 from connecting the left brake pedal 50 and the right brake pedal 70 in a predetermined case. The front connection regulating portion 93 is formed in a plate shape with the plate surface facing left and right. The front connection restricting portion 93 is formed so as to extend forward from the right end of the front rotation restricting portion 92.

The rear rotation restricting unit 94 is a portion that restricts the right brake pedal 70 from rotating rearward relative to the left brake pedal 50. The rear rotation restricting portion 94 is formed in a plate shape with the plate surface facing back and forth. The rear rotation restricting portion 94 is formed so as to extend to the right from the rear end of the restricting portion connecting portion 91.

The rear side connection restricting portion 95 is a portion that prevents (regulates) the connecting portion 90 from connecting the left brake pedal 50 and the right brake pedal 70 in a predetermined case. The rear connection restricting portion 95 is formed in a plate shape with the plate surface facing left and right. The rear connection restricting portion 95 is formed so as to extend rearward from the right end of the rear rotation restricting portion 94.

The above-mentioned restricting portion connecting portion 91, front rotation restricting portion 92, front side connecting regulating portion 93, rear side rotation restricting portion 94, and rear side connecting restricting portion 95 are formed by appropriately bending one plate material. .. Further, the rear rotation restricting portion 94 and the rear side connection regulating portion 95 are formed so as to have a shape substantially symmetrical in the front-rear direction with the front side rotation restricting portion 92 and the front side connecting regulating portion 93. Further, the distance between the front rotation restricting portion 92 and the rear rotation restricting portion 94 (gap in the front-rear direction) is formed so as to be substantially the same as the width in the front-rear direction of the engaging portion 75b of the connected portion 75.

The reinforcing portion 96 is a portion that connects the front rotation restricting portion 92 and the front connecting regulating portion 93. The reinforcing portion 96 includes two plate members (first plate member 96a and second plate member 96b).

The first plate member 96a is arranged so as to be parallel to the front rotation restricting portion 92. The first plate member 96a is fixed to the front end portion of the front side connection restricting portion 93. The first plate member 96a is arranged so as to extend to the left from the front side connection restricting portion 93.

The second plate member 96b is arranged so as to be parallel to the front side connection restricting portion 93. The second plate member 96b is fixed to the left end portion of the first plate member 96a. The second plate member 96b is arranged so as to extend rearward from the first plate member 96a. The rear end portion of the second plate member 96b is fixed to the front rotation restricting portion 92 via the contact portion 98 described later.

In this way, the reinforcing portion 96 (first plate material 96a and second plate material 96b), the front rotation restricting portion 92, and the front connecting restricting portion 93 form a rectangular frame in a plan view.

The wire connecting portion 97 is a portion to which the wire 141 (see FIG. 10) that transmits the movement (rotational operation) of the brake connection releasing pedal 140 to the connecting portion 90 is connected. The wire connecting portion 97 is formed of a substantially columnar member (pin). The wire connecting portion 97 is provided so as to project forward from the front surface (first plate member 96a) of the reinforcing portion 96.

The contact portion 98 is a portion that comes into contact with the connection release restricting portion 124 of the parking brake mechanism 120, which will be described later. The contact portion 98 is formed in a plate shape with the plate surface facing back and forth. The contact portion 98 is fixed in the vicinity of the right end portion on the front surface of the front rotation restricting portion 92. The rear end portion of the second plate member 96b of the reinforcing portion 96 is fixed to the front surface of the contact portion 98. That is, the second plate member 96b is fixed to the front rotation restricting portion 92 via the contact portion 98.

The return spring locking portion 99 is a portion in which the return spring 99a (see FIG. 10) that urges the connecting portion 90 to rotate toward the initial position is locked. The initial position of the connecting portion 90 is the position of the connecting portion 90 in a state where the brake connection release pedal 140 is not operated, and is a position that is rotated to the maximum clockwise in the rear view. The return spring locking portion 99 is formed by appropriately bending a substantially columnar (rod-shaped) member. The return spring locking portion 99 is fixed to the left side surface of the regulating portion connecting portion 91. The return spring locking portion 99 is arranged so as to project forward from the regulating portion connecting portion 91. The front end of the return spring locking portion 99 is bent downward.

As shown in FIGS. 9 and 10, the connecting portion 90 is rotatably supported by the left brake pedal 50 via a substantially columnar connecting portion rotating shaft 90a. Specifically, the connecting portion 90 is arranged so that the regulating portion connecting portion 91 is located on the left side of the arm portion 52 (the side opposite to the connected portion 75). Further, the connecting portion 90 is arranged so as to sandwich the left brake pedal 50 (connecting portion supporting portion 57) from the front and rear by the front rotation restricting portion 92 and the rear rotation restricting portion 94. In this state, the connecting portion rotating shaft 90a whose axial direction is directed back and forth is inserted into the front rotation restricting portion 92, the connecting portion supporting portion 57, and the rear side rotation restricting portion 94. As a result, the connecting portion 90 is supported so as to be rotatable about the connecting portion rotating shaft 90a.

One end of the return spring 99a is locked to the return spring locking portion 99. The other end of the return spring 99a is locked to the locking portion 56c of the left brake pedal 50. The connecting portion 90 is constantly urged clockwise in the rear view by the urging force of the return spring 99a.

The parking brake rotation shaft 110 shown in FIGS. 5, 9 and 10 rotatably supports the parking brake mechanism 120 and the like, which will be described later. The parking brake rotation shaft 110 is formed in a substantially columnar shape. The parking brake rotation shaft 110 is arranged substantially below the pedal rotation shaft 30 with the axial direction directed to the left and right. The parking brake rotation shaft 110 is fixed to the operating tool bracket 11.

The parking brake mechanism 120 holds the left brake pedal 50 and the right brake pedal 70 at the depressed position. The parking brake mechanism 120 mainly includes a central portion 121, a parking brake operating tool 122, a pedal rotation restricting unit 123, a connection release restricting unit 124, and a detected unit 125.

The central portion 121 shown in FIGS. 9, 10, 14 and 15 is a portion serving as a rotation center of the parking brake mechanism 120. The central portion 121 is formed in a substantially cylindrical shape with the axial direction directed to the left and right.

The parking brake operating tool 122 is a portion that the operator grasps when operating the parking brake mechanism 120. The parking brake operating tool 122 is formed so as to extend from the central portion 121 in the radial direction of the central portion 121. One end (front upper end) of the parking brake operating tool 122 is fixed to the rear lower portion of the outer peripheral surface of the central portion 121. The parking brake operating tool 122 is formed of a plate material so as to extend linearly rearward and downward from the central portion 121 in a side view.

The pedal rotation restricting portion 123 is a portion that regulates the rotation of the left brake pedal 50 by engaging with the meshing portion 55 of the left brake pedal 50. The pedal rotation restricting portion 123 is formed so as to extend from the central portion 121 in the radial direction of the central portion 121. One end (rear end) of the pedal rotation restricting portion 123 is fixed to the front portion of the outer peripheral surface of the central portion 121. The other end (front end) of the pedal rotation restricting portion 123 is formed in a sharp shape capable of meshing with the meshing portion 55 of the left brake pedal 50. The pedal rotation restricting portion 123 is provided at a substantially central portion on the left and right sides of the central portion 121.

The connection release regulating unit 124 maintains the connection state of the left brake pedal 50 and the right brake pedal 70 by the connection unit 90 by restricting the rotation of the connection unit 90 in a predetermined case (the connection is released). Is the part that regulates). The connection release restricting portion 124 is formed so as to extend from the central portion 121 in the radial direction of the central portion 121. One end (rear end) of the disconnection restricting portion 124 is fixed to the front portion of the outer peripheral surface of the central portion 121. The connection release restricting portion 124 is formed of a plate material having a portion extending forward and downward from the central portion 121 and a portion extending forward and upward from the front end portion of the portion in a side view. As a result, the connection release restricting unit 124 is formed in a substantially L-shape in side view. The connection release restricting portion 124 is provided near the right end portion of the central portion 121 (on the right side of the pedal rotation restricting portion 123).

The detected portion 125 is a portion for detecting the position of the parking brake mechanism 120 by the parking brake detection sensor 160 described later. The detected portion 125 is provided so as to project forward from the vicinity of the left end portion of the central portion 121 (left side of the pedal rotation restricting portion 123).

In the parking brake mechanism 120, the central portion 121 is inserted through the parking brake rotating shaft 110. The central portion 121 is supported by the parking brake rotation shaft 110 so as to be rotatable. When the parking brake mechanism 120 is supported by the parking brake rotation shaft 110, the connection release restricting portion 124 is placed between the arm portion 52 of the left brake pedal 50 and the connecting arm portion 75a of the right brake pedal 70 in the left-right direction. Be placed. At this time, the connection release restricting portion 124 is arranged at substantially the same position as the engaging portion 75b of the right brake pedal 70 in the left-right direction. Further, the connection release restricting portion 124 is arranged at a position different from the engaging portion 75b (specifically, above the engaging portion 75b) in the radial direction of the pedal rotation shaft 30. Further, the pedal rotation restricting portion 123 is arranged substantially above the toothed portion 55 of the left brake pedal 50.

The brake detection sensor 150 shown in FIG. 3 detects the positions of the left brake pedal 50 and the right brake pedal 70. Two brake detection sensors 150 are provided so as to correspond to the left brake pedal 50 and the right brake pedal 70. The brake detection sensor 150 is fixed to the vicinity of the right end of the parking brake rotation shaft 110 (on the right side of the parking brake mechanism 120) via the bracket 151. The left brake detection sensor 150 is arranged at a position where the left brake pedal 50 comes into contact with the detected portion 54 of the left brake pedal 50 when the left brake pedal 50 is in the initial position. Further, the right brake detection sensor 150 is arranged at a position where the right brake pedal 70 comes into contact with the detected portion 74 of the right brake pedal 70 when the right brake pedal 70 is in the initial position. The brake detection sensor 150 detects that the left brake pedal 50 and the right brake pedal 70 are in the initial positions by contacting the left brake pedal 50 and the right brake pedal 70 (detected portion 54 and detected portion 74). can do.

The parking brake detection sensor 160 shown in FIG. 4 detects the position of the parking brake mechanism 120. The parking brake detection sensor 160 is appropriately fixed to the operating tool bracket 11. The parking brake detection sensor 160 is arranged at a position where the parking brake mechanism 120 comes into contact with the detected portion 125 (see FIG. 15 or the like) of the parking brake mechanism 120 when the parking brake mechanism 120 is in the initial position. The parking brake detection sensor 160 can detect that the parking brake mechanism 120 is in the initial position by contacting the parking brake mechanism 120 (detected portion 125).

Hereinafter, how to use the left brake pedal 50 and the right brake pedal 70 will be described.

As shown in FIGS. 9, 10 and 16 (a), when the connecting portion 90 is in the initial position, the front rotation restricting portion 92 and the rear rotation restricting portion 94 of the connecting portion 90 are the right brake pedals. The connected portion 75 (engaging portion 75b) of the 70 is arranged so as to sandwich it from the front and back. That is, the connecting portion 90 provided on the left brake pedal 50 is engaged with the connected portion 75 of the right brake pedal 70. As a result, the right brake pedal 70 cannot rotate relative to the left brake pedal 50. That is, the left brake pedal 50 and the right brake pedal 70 are connected by the connecting portion 90 and rotate integrally. The position (initial position) of the connecting portion 90 is hereinafter referred to as a "brake connecting position".

When the connecting portion 90 is in the brake connecting position, the left brake pedal 50 and the right brake pedal 70 can be integrally rotated by depressing at least one of the left brake pedal 50 and the right brake pedal 70. can. As a result, the left and right rear wheels 4 of the tractor 1 are braked at the same time.

In the present embodiment, the connecting portion 90 is not the arm portion 72 provided with the stepping portion 73 in the right brake pedal 70, but is connected to be arranged at a position closer to the left brake pedal 50 than the arm portion 72. Engage with the portion 75. Since the connecting portion 90 engages with the connected portion 75 arranged at a relatively close position in this way, the load applied to the connecting portion 90 can be reduced.

Further, with the connecting portion 90 in the brake connecting position, the left brake pedal 50 and the right brake pedal 70 are depressed, and the parking brake operating tool 122 (see FIG. 15) is lifted upward (turned counterclockwise when viewed from the left side). By moving the pedal rotation restricting portion 123 downward, the pedal rotation restricting portion 123 can be made to mesh with the meshing portion 55. As a result, the rotation of the left brake pedal 50 and the right brake pedal 70 is restricted, and the left brake pedal 50 and the right brake pedal 70 can be held at the depressed position. In this state, even if the operator takes his / her foot off the left brake pedal 50 and the right brake pedal 70, the rear wheel 4 of the tractor 1 can be held in the braked state (parking brake is applied).

As shown in FIGS. 9 and 10, the connection release restricting unit 124 is located above the connection unit 90. Therefore, when the parking brake operating tool 122 is lifted and the parking brake is applied, the connection release restricting unit 124 swings downward and approaches the connection unit 90. In this state, even if the connecting portion 90 tries to rotate upward by operating the brake connection releasing pedal 140 described later, the contact portion 98 of the connecting portion 90 comes into contact with the connecting disconnection restricting portion 124, so that the connecting portion 90 Cannot rotate. That is, when the parking brake is applied, the connection between the left brake pedal 50 and the right brake pedal 70 by the connecting portion 90 is not released.

When the left brake pedal 50 and the right brake pedal 70 are released from the connection portion 90, the brake connection release pedal 140 (see FIGS. 2 and 3) is stepped on without the parking brake being applied. As a result, the connecting portion 90 rotates counterclockwise in the rear view around the connecting portion rotating shaft 90a via the wire 141 (see FIG. 10) connected to the brake disconnection release pedal 140 (FIG. 16 (FIG. 10). b) and FIG. 17).

In this state, the front rotation restricting portion 92 and the rear rotation restricting portion 94 of the connecting portion 90 are retracted from the front and rear of the connected portion 75 (engaging portion 75b) of the right brake pedal 70. That is, the engagement between the connecting portion 90 and the connected portion 75 is released. As a result, the right brake pedal 70 can rotate relative to the left brake pedal 50. The position of the connecting portion 90 is hereinafter referred to as a "brake connection release position".

When the connecting portion 90 is in the brake connection release position, the left brake pedal 50 and the right brake pedal 70 can be stepped on independently of each other. As a result, only one of the left and right rear wheels 4 of the tractor 1 can be braked.

When either the left brake pedal 50 or the right brake pedal 70 is operated while the connecting portion 90 is in the brake connecting release position, even if the connecting portion 90 tries to return to the brake connecting position, the front and rear The front side connection restricting portion 93 or the rear side connection regulating portion 95 formed so as to extend into contact with the connected portion 75 (engaged portion 75b). Therefore, the connecting portion 90 cannot return to the brake connecting position when either the left brake pedal 50 or the right brake pedal 70 is being operated. This makes it possible to prevent the left brake pedal 50 and the right brake pedal 70 from being unintentionally connected.

As described above, the tractor 1 according to the present embodiment is
Central portion 51 (first central portion) rotatably supported with respect to the pedal rotation shaft 30
An arm portion 52 (first arm portion) formed so as to extend radially from the central portion 51,
And the left brake pedal 50 (first brake pedal) provided on the arm portion 52 and having a stepping portion 53 (first stepping portion) that can be stepped on.
A central portion 71 (second central portion) rotatably supported with respect to the pedal rotation shaft 30.
An arm portion 72 (second arm portion) formed so as to extend radially from the central portion 71,
A stepping portion 73 (second stepping portion) provided on the arm portion 72 and capable of stepping operation,
And the connected portion 75 formed so as to extend from the central portion 71 in the radial direction while being formed on the left brake pedal 50 side of the arm portion 72 in the axial direction of the pedal rotation shaft 30. With the right brake pedal 70 (second brake pedal)
A connecting portion that is provided on the arm portion 52 and is movable between a brake connecting position that is engaged with the connected portion 75 and a brake connecting disengaging position that is disengaged from the connected portion 75. 90 and
Is provided.
With this configuration, the connecting portion 90 is connected to the connected portion 75 arranged at a position closer to the left brake pedal 50 (arm portion 52) than the arm portion 72 of the right brake pedal 70, so that the connecting portion 90 is connected. The load applied to the portion 90 can be reduced. Along with this, it is possible to reduce the size and cost of the connecting portion 90.

Further, the right brake pedal 70 is
It is formed between the arm portion 72 and the connected portion 75 in the axial direction of the pedal rotation shaft 30, and is formed so as to extend radially from the central portion 71 and is connected to the braking device. It further includes a link connecting portion 77 (first link connecting portion) to which the linked link member 77b (first link member) is connected.
With this configuration, by connecting the link member 77b to the link connecting portion 77 provided between the arm portion 72 and the connected portion 75, the link member 77b and the arm portion 72 or the connected portion 75 are connected. It is possible to easily avoid interference with. That is, the link member 77b can be easily arranged in the gap between the arm portion 72 and the connected portion 75.

Further, the connected portion 75 is
A connecting arm portion 75a formed so as to extend radially from the central portion 71,
Of the side surfaces of the connecting arm portion 75a, the engaging portion 75b fixed to the side surface on the left brake pedal 50 side in the axial direction of the pedal rotation shaft 30 and to which the connecting portion 90 can engage.
Is provided.
With this configuration, the connecting portion 90 is connected to the engaging portion 75b fixed to the side surface of the connecting arm portion 75a on the left brake pedal 50 side (the side surface close to the left brake pedal 50), so that the connecting portion 90 is connected. The load applied to the 90 can be further reduced. Further, the space on the left brake pedal 50 side of the connecting arm portion 75a (the space between the connecting arm portion 75a and the left brake pedal 50, in which the engaging portion 75b is not provided) is a space of another member. It can be effectively used for placement and the like.

In addition, the tractor 1
Further, a parking brake mechanism 120 for holding the left brake pedal 50 and the right brake pedal 70 at a depressed position is further provided.
The parking brake mechanism 120
Operable parking brake operating tool 122 (operation unit) and
As the parking brake operating tool 122 is operated, the pedal rotation restricting unit 123 that regulates the rotation of the left brake pedal 50 by engaging with the left brake pedal 50,
The parking brake operating tool 122 is arranged at the same position as the engaging portion 75b in the axial direction of the pedal rotating shaft 30 and at a position different from the engaging portion 75b in the radial direction of the pedal rotating shaft 30. A connection release restricting unit 124 that restricts the movement of the connection unit 90 to the brake connection release position as it is operated,
Is provided.
With this configuration, the space on the left brake pedal 50 side of the connecting arm portion 75a (the space between the connecting arm portion 75a and the left brake pedal 50, in which the engaging portion 75b is not provided). Can be effectively used for the arrangement of the decoupling control unit 124.

In addition, the engaging portion is
It is arranged outside the connection release restricting portion 124 in the radial direction of the pedal rotation shaft 30.
With this configuration, the engaging portion 75b is arranged radially outside (lower side in this embodiment) of the disengagement restricting portion 124, so that the engaging portion 75b is located at a position relatively far from the pedal rotation shaft 30. The engaging portion 75b can be engaged with the connecting portion 90. As a result, when the connecting portion 90 is engaged with the connected portion 75, the load applied to the connecting portion 90 can be suppressed to be relatively small. That is, by setting a relatively large distance between the fulcrum (pedal rotation shaft 30) and the point of action (engagement portion 75b), the force applied to the point of action (engagement portion 75b) can be suppressed.

Further, the right brake pedal 70 is
It further includes a reinforcing portion 76 (first reinforcing portion) provided so as to connect the arm portion 72 and the connected portion 75.
With this configuration, the strength of the right brake pedal 70 (arm portion 72 and connected portion 75) can be improved.

Further, the connecting portion 90 is
It is provided so as to be swingable with respect to the arm portion 52 via a connecting portion rotating shaft 90a provided non-parallel to the pedal rotating shaft 30, and swings around the connecting portion rotating shaft 90a. Then, the brake is moved to the brake connection position or the brake connection release position.
With this configuration, the left brake pedal 50 and the right brake pedal 70 can be connected or disconnected by a simple operation (swing operation).

The connecting portion 90 is
The arm portion 52 is arranged on one side (front side) in the rotation direction, and at the brake connecting position, the relative rotation of the connected portion 75 with respect to the arm portion 52 in the rotation direction one side (front side) is performed. The front rotation control unit 92 (first rotation regulation unit) that can be regulated and
Arranged on the other side (rear side) of the rotation direction of the arm portion 52, the relative rotation of the connected portion 75 to the other side (rear side) of the rotation direction with respect to the arm portion 52 at the brake connecting position. Rear rotation control unit 94 (second rotation regulation unit) that can regulate movement,
On the side (left side) opposite to the connected portion 75 with the arm portion 52 sandwiched between the first rotation restricting portion and the second rotation restricting portion, the restricting portion connecting portion 91 connecting the first rotation restricting portion and the second rotation restricting portion.
Is provided.
With this configuration, the left brake pedal 50 and the right brake pedal 70 can be connected with a simple configuration.

Further, the connecting portion 90 is
A front connection restricting portion 93 (first connection restricting portion) extending from the end of the front rotation restricting portion 92 on the 75 side of the connected portion 75 to one side (front side) in the rotation direction.
A rear connection restricting portion 95 (second connection restricting portion) extending from the end of the rear rotation restricting portion 94 on the 75 side of the connected portion 75 to the other side (rear side) in the rotation direction.
Is further provided.
With this configuration, when the positions of the left brake pedal 50 and the right brake pedal 70 are misaligned (for example, one of them is being operated), the front side connection restricting unit 93 or the rear side connection regulation unit 93 or the rear side connection regulation unit When the 95 comes into contact with the right brake pedal 70 (connected portion 75), it is possible to prevent the connecting portion 90 from moving to the brake connecting position.

Further, the connecting portion 90 is
It further includes a reinforcing portion 96 (second reinforcing portion) provided so as to connect the front side rotation restricting portion 92 and the front side connecting restricting portion 93.
With such a configuration, the strength of the connecting portion 90 can be improved.

Further, the reinforcing portion 96 is
Together with the front rotation restricting portion 92 and the front connecting restricting portion 93, it is provided so as to form a substantially rectangular frame.
With such a configuration, the strength of the connecting portion 90 can be improved.

Further, the connecting portion 90 is
A wire 141 (second link member) provided in the reinforcing portion 96 and connected to a brake connection release pedal 140 (release operation tool) for moving the connection portion 90 to the brake connection release position is connected. It further includes a wire connecting portion 97 (second link connecting portion).
With this configuration, the strength of the connecting portion 90 can be improved by receiving the operating load when moving the connecting portion 90 to the brake connection release position by the reinforcing portion 96.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications can be made within the scope of the invention described in the claims.

For example, in the present embodiment, the connected portion 75 is provided on the right brake pedal 70, but it is also possible to provide the connected portion 75 on the left brake pedal 50. In this case, the left brake pedal 50 and the right brake pedal 70 can be connected by providing the right brake pedal 70 with a connecting portion 90 and connecting the connecting portion 90 with the connected portion 75 of the left brake pedal 50.

Further, in the present embodiment, the connected portion 75 is formed so as to extend radially from the central portion 71 of the right brake pedal 70, but the present invention is not limited to this. For example, the connected portion 75 may be formed so as to extend laterally (on the left brake pedal 50 side) from the arm portion 72 of the right brake pedal 70. As a result, the connecting portion 90 and the connected portion 75 can be brought close to each other, and the load applied to the connecting portion 90 can be reduced.

Further, in the present embodiment, the connected portion 75 is provided with the connecting arm portion 75a and the engaging portion 75b, but the present invention is not limited to this, and the connected portion 75 has an arbitrary configuration. Is possible. For example, it is possible to directly engage the connecting portion 90 with the connecting arm portion 75a without providing the engaging portion 75b on the connected portion 75.

Further, in the present embodiment, the connecting portion 90 is moved to the brake connecting position or the brake connecting release position by rotating around the connecting portion rotating shaft 90a, but the present invention is limited to this. is not it. For example, the connecting portion 90 may be provided so as to be slidable to the left and right with respect to the left brake pedal 50, and the connecting portion 90 may be slid to move to the brake connecting position or the brake connecting release position. It is possible.

Further, in the present embodiment, the connecting portion 90 engages with the connected portion 75 by sandwiching the connected portion 75 from the front and back, but the present invention is not limited to this. For example, it is possible to engage the connecting portion 90 with the connected portion 75 by inserting the connecting portion 90 into a notch, a hole, or the like formed in the connected portion 75.

Further, in the present embodiment, the reinforcing portion 96 of the connecting portion 90 is provided so as to connect the front side rotation restricting portion 92 and the front side connecting regulating portion 93, but the present invention is not limited to this. For example, the reinforcing portion 96 can be provided so as to connect the rear rotation restricting portion 94 and the rear connecting regulating portion 95. Further, the reinforcing portion 96 is connected to the front rotation regulating portion 92 and the front connecting regulating portion 93, and the rear rotation regulating portion 94 and the rear connecting regulating portion 95 (that is, 2 before and after the connecting portion 90). It is also possible to provide one).

Further, in the present embodiment, the tractor 1 is illustrated as a work vehicle, but the present invention is not limited to this. That is, the work vehicle may be another agricultural vehicle, construction vehicle, industrial vehicle, or the like.

1 Tractor 30 Pedal rotation shaft 50 Left brake pedal 51 Central part 52 Arm part 53 Stepping part 70 Right brake pedal 71 Central part 72 Arm part 73 Stepping part 75 Connected part 90 Connecting part

Claims (12)

The first central part, which is rotatably supported with respect to the pedal rotation shaft,
A first arm portion formed so as to extend radially from the first central portion,
And a first brake pedal provided on the first arm portion and having a first stepping portion that can be stepped on.
A second central portion rotatably supported with respect to the pedal rotation shaft,
A second arm portion formed so as to extend radially from the second central portion,
A second stepping portion provided on the second arm portion and capable of stepping operation,
And the connected portion formed so as to be formed on the first brake pedal side of the second arm portion in the axial direction of the pedal rotation shaft and to extend radially from the second central portion. With the second brake pedal to have
A connecting portion that is provided on the first arm portion and is movable between a brake connecting position that is engaged with the connected portion and a brake connecting disengaging position that is disengaged from the connected portion. ,
A work vehicle equipped with. The second brake pedal is
It is formed between the second arm portion and the connected portion in the axial direction of the pedal rotation shaft, and is formed so as to extend radially from the second central portion and is connected to the braking device. A first link connecting portion to which the first link member is connected is further provided.
The work vehicle according to claim 1. The connected portion is
A connecting arm portion formed so as to extend radially from the second central portion,
Of the side surfaces of the connecting arm portion, an engaging portion fixed to the side surface on the first brake pedal side in the axial direction of the pedal rotation shaft and to which the connecting portion can engage.
Equipped with
The work vehicle according to claim 1 or 2. Further provided with a parking brake mechanism for holding the first brake pedal and the second brake pedal at the depressed position.
The parking brake mechanism
Operable operation unit and
As the operation unit is operated, the rotation of the first brake pedal or the second brake pedal is caused by engaging with at least one of the first brake pedal and the second brake pedal. The pedal rotation regulation part to regulate and
It is arranged at the same position as the engaging portion in the axial direction of the pedal rotating shaft and at a position different from the engaging portion in the radial direction of the pedal rotating shaft, and as the operating portion is operated. , The connection release regulation part that regulates the movement of the connection part to the brake connection release position,
Equipped with
The work vehicle according to claim 3. The engaging portion is
In the radial direction of the pedal rotation shaft, it is arranged outside the connection release restricting portion.
The work vehicle according to claim 4. The second brake pedal is
A first reinforcing portion provided so as to connect the second arm portion and the connected portion is further provided.
The work vehicle according to any one of claims 1 to 5. The connecting portion
It is provided so as to be swingable with respect to the first arm portion via a connecting portion rotating shaft provided non-parallel to the pedal rotating shaft, and swings around the connecting portion rotating shaft. Move to the brake connection position or the brake connection release position.
The work vehicle according to any one of claims 1 to 6. The connecting portion
The first arm portion is arranged on one side in the rotation direction, and the relative rotation of the connected portion with respect to the first arm portion in the rotation direction can be regulated at the brake connecting position. Rotation control part and
A second arm portion that is arranged on the other side in the rotation direction and can regulate the relative rotation of the connected portion to the other side in the rotation direction with respect to the first arm portion at the brake connecting position. Rotation control part and
On the side of the first arm portion that opposes the connected portion, a restricting portion connecting portion that connects the first rotation restricting portion and the second rotation restricting portion, and a regulating portion connecting portion.
Equipped with
The work vehicle according to any one of claims 1 to 7. The connecting portion
A first connection restricting portion extending from the end of the first rotation restricting portion on the side to be connected to one side in the rotation direction,
A second connection restricting portion extending from the end of the second rotation restricting portion on the side to be connected to the other side in the rotation direction,
Further equipped,
The work vehicle according to claim 8. The connecting portion
Further provided is a second reinforcing portion provided so as to connect at least one of the first rotation restricting portion and the first connection regulating portion, or the second rotation regulating portion and the second connecting regulating portion. ,
The work vehicle according to claim 9. The second reinforcing portion is
It is provided so as to form a substantially rectangular frame together with at least one of the first rotation restricting unit and the first connection restricting unit, or the second rotation restricting unit and the second connection restricting unit.
The work vehicle according to claim 10. The connecting portion
A second link connecting portion provided in the second reinforcing portion and to which a second link member connected to a release operating tool for moving the connecting portion to the brake connection releasing position is further provided.
The work vehicle according to claim 10 or 11.

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