JPH10329573A - Pedal structure of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the pedal structure of a working machine capable of performing an assembly work easily. SOLUTION: The pedal structure of a working machine is structured so that a pedal arm 26 to one end of which a depressing part 25 is interconnected, a pivot shaft 27 for rotatably supporting the pedal arm 26 on a support part 7a located at the underside of a step part 7 on a frame side, and an operating arm 28 interconnected to a mechanism to be operated are formed integrally with each other, a flat part 32 larger in width than the diameter of a pivot shaft 27 and smaller in thickness than it is press-formed in the pivot shaft 27, and a projection 33 projected from the pivot shaft 27 is provided at the side of the flat part 32. Also a notch part 31 which connects the bearing through hole 30 to the outer periphery of the support part 7a of the pivot shaft 27 at the support part 7a is formed so that the flat part 32 of the pivot shaft 27 can be inserted and is formed smaller in width than the shaft diameter of the pivot shaft 27. In addition, a second notch part 34 capable of passing the projection 33 when the pivot shaft 27 is moved along the lateral direction at a phase different from the range of depressing operation angle of the depressing part 25 is provided in the bearing through hole 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pedal structure of a working machine such as an agricultural tractor.

[0002]

2. Description of the Related Art Conventionally, an accelerator pedal or the like in a working machine such as an agricultural tractor includes a pedal portion to be depressed, a pedal arm portion thereof, a support shaft portion connected to the pedal arm portion, and an accelerator mechanism. The operation arm portions for linking to the operated mechanism have been formed of different parts.

[0003]

Therefore, in the prior art, the pedal, the pedal arm, the support shaft, and the operation arm must be assembled to the step portion of the operating unit of the working machine, which is troublesome. It was such a thing. That is, the support shaft portion is assembled so as to be inserted and supported by a support portion for supporting the shaft at a hidden portion below the step portion, and the support shaft portion, the pedal arm portion, and the operation arm portion are bolted or welded. And so on, and the pedal arm and pedal are connected by bolting or welding, etc., especially in the work of supporting the shaft below the step and the work of connecting each arm and the shaft. It was troublesome.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide a pedal structure of a working machine capable of simplifying an assembling operation.

[0005]

[Means for Solving the Problems]

(Structure) In the pedal structure of the working machine according to the first aspect of the present invention, a pedal arm having a stepped portion connected to one end thereof and a support portion provided below the step portion of the body of the body are pivoted. While integrally forming a pedal support shaft for freely supporting and an operation arm linked to the operated mechanism,
A flat portion having a thickness wider than the shaft diameter and smaller than the shaft diameter is press-formed on the pedal support shaft, and a projection protruding from the pedal support shaft is provided at a lateral side of the flat portion, and A notch connecting the bearing through-hole of the pedal support shaft and the outer edge of the support portion is formed so as to allow the flat portion of the pedal support shaft to pass therethrough and to have a width smaller than the shaft diameter of the support shaft, When the pedal support shaft is moved in a lateral direction at a phase different from the stepping operation angle range of the stepping portion, a second cutout portion through which the projection can pass is provided in the bearing through-hole. Is a characteristic configuration.

(Operation) According to the first aspect of the present invention, the flat portion of the pedal support shaft can be positioned in the bearing through hole of the support portion through the cutout portion of the support portion. After the pedal support shaft is laterally moved in a state where the projection of the pedal support shaft can pass through the second cutout portion, the pedal support shaft and the pedal arm integrated with the pedal support shaft are set in the depression angle range of the depression portion. When the pedal support shaft is rotated in this state, even if the pedal support shaft is moved in the
Since there is no notch, the protrusion is restricted in the lateral direction by the support portion, and as a result, the pedal support shaft does not unduly shift laterally when used for stepping.

(Effect) Therefore, according to the configuration of the first aspect of the present invention, the pedal arm, the pedal support shaft, and the operation arm are integrally formed, so that they are separately provided as in the related art. Compared with the conventional components, the labor for connecting them can be reduced, and the number of parts can be reduced, so that the cost can be reduced. Also, as for the assembly of a pedal support shaft having a complicated structure which is bent as a whole by providing the pedal arm and the operation arm integrally, the flat portion of the pedal support shaft can be inserted into the bearing through hole through the cutout portion of the support portion. In order to prevent the pedal support shaft from slipping out of the notch in this state, insert the pedal support shaft into the support portion, and then move it laterally so that the flat portion is not located at the bearing through-hole, and then rotate it. Only the simple work, and the workability of the assembly can be improved. Further, the second notch allows the projection of the pedal support shaft to pass through the support portion during the lateral movement of the pedal support shaft, but prevents the pedal from laterally shifting when the pedal is used. In the state where the attitude of the pedal support shaft with respect to the bearing through hole is set in the angle range, the projection is restricted by the support portion from moving in the axial center direction of the pedal support shaft,
In terms of structure, there is no need to separately attach a dedicated member for restricting lateral movement to the pedal support shaft, and there is an advantage that lateral displacement can be easily prevented. In addition, since the flat portion is pressed, it can be formed simply and at low cost.

(Structure) A pedal structure of a working machine according to a second aspect of the present invention is the pedal structure according to the first aspect, wherein the support portion is cut out from the step portion and bent. Configuration.

(Operation) According to the structure of the second aspect of the present invention, since the support portion is cut out from the step portion and bent, the support portion is also formed as a support portion on the step portion. There is no need to install special parts.

(Effects) Therefore, according to the configuration of the second aspect of the present invention, since there is no need to attach a dedicated component as a support portion to the step portion, no component or the like for the attachment is required. For this reason, the cost can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an agricultural tractor. This agricultural tractor is configured such that an engine 4, a boarding operation unit 5, a transmission case 6, and the like are mounted on an airframe 3 movably supported by a pair of left and right front wheels 1, 1 and rear wheels 2, 2. ing.

As shown in FIG. 1 to FIG.
In the step portion 7, a main clutch pedal 8, a pair of left and right side brake pedals 9L and 9R for performing braking on the left and right rear wheels 2 and 2, and an accelerator pedal 10 are provided. As shown in FIGS. 3 and 6, the main clutch pedal 8 and the pair of left and right side brake pedals 9L and 9R are mounted on the left and right sides of a sheet metal main frame 11 formed in a downward U-shape in a front view. Tube boss 12
Is pivotally supported on a brake operation shaft 13 inserted around the shaft shaft so as to be rotatable around a horizontal axis Q1. Specifically, as shown in FIG. 8, the main frame 11 is formed by stamping and pressing a sheet metal from a single plate. At the front end of the main frame 11, a front connecting portion 15 for bolting to the housing 14 of the main clutch device is provided, and at the rear end of the main frame 11,
A rear connecting portion 16 for fastening a bolt to the transmission case 6 is provided. As shown in FIG. 8, the front connecting portion 15 includes a pair of right and left rising portions 15a, 15a, mounting brackets 15b, 15b provided by welding to them, and left and right side wall portions 11L, 11R of the main frame 11. And a reinforcing frame 15c installed on the vehicle. Also,
As shown in FIG. 8, the rear connecting portion 16 is provided between a pair of right and left rising portions 16a, 16a, mounting brackets 16b, 16b provided by welding them, and left and right side wall portions 11L, 11R of the main frame 11. And a reinforced reinforcing frame 16c. The metal tube boss 12 is fixed in a state of being bridged between the lower portions of the left and right side walls 11L and 11R. A brake operation shaft 13 that connects the base end of the left side brake pedal 9L with a pin 17 is rotatably fitted inside the cylindrical boss 12, and right and left brakes are provided on the left and right sides of the brake operation shaft 13. The bosses 18 and 19 at the base end of the pedal 9R and the main clutch pedal 8, respectively, are rotatably fitted around the horizontal axis Q1. Arms 18a and 19 connected to the boss 18, the boss 19, and the left end of the brake operation shaft 13, respectively.
a, 13a include a rod 18 for operating the right side brake.
b, Rod 19 for operation of main clutch with turnbuckle
b, the left side brake operating rod 13b is connected.

As shown in FIGS. 2, 3, 6 and 8,
At the upper portions of the left and right side walls 11L, 11R of the main frame 11, the step portions 7, 7 made of sheet metal are bolted via anti-vibration rubbers 21, 21 in a state of being extended laterally outward. I have. And, in each step part 7,7,
The main clutch pedal 8, the side brake pedal 9L,
A stopper S is provided to stop hitting when returning to the non-depressing operation posture of each of the 9Rs. The stopper S is formed by bending a cutout portion 22 cut out in a substantially rectangular shape from the step portions 7, 7 corresponding to each pedal position in a stepped manner on the surface of the step portions 7, 7, and The stopper block 23 made of synthetic rubber is inserted and mounted. With the stopper block 23 inserted, the distal end portion 22a of the cut-out portion 22 is exposed outside the stopper block 23, and this exposed portion is inserted into the stopper block 23 as shown in FIG. Because it is wider than the part where it is located, the stopper block 23 has a retaining structure. Since the width of the stopper block 23 is wider than the width of the cutout hole 24 of the step portions 7, 7 from which the cutout portion 22 is cut, FIG.
As shown in (a) and (b), even when the arm of the pedal presses and contacts the stopper block 23 from below, the left and right sides of the upper surface of the stopper block 23 contact the lower surfaces of the step portions 7, 7. Because it is regulated, cut out part 2
2 is not unreasonably bent upward.

Next, the structure of the accelerator pedal 10 will be described. As shown in FIGS. 2 to 5, the accelerator pedal 10 has a pedal portion 25 as a stepping portion for performing a stepping operation integrally provided on a pedal arm 26 by welding or the like, and the pedal arm 26 and the pedal arm 2.
A pedal support shaft 27 for swingably supporting the body 6 about the horizontal axis Q2 with respect to the body 3 and an operation arm for linking with a governor (not shown) as a mechanism operated by the engine 4. 28 is formed by bending a single metal rod member to be integrated. And the accelerator pedal 10
The pedal support shaft 27 is inserted into bearing through-holes 30, 30 formed in support portions 7a, 7a, which are cut out at two positions on the left and right sides of the front portion of the step portion 7 and bent downward from the step portion 7, respectively. By supporting in the inserted state, support mounting to the body 3 is achieved. In other words, the support through-holes 30, 30 each having substantially the same diameter as the axis of the pedal support shaft 27 are formed in the support 7a, 7a cut out in a rectangular shape in a side view.
Notches 31, 31 through which the pedal support shaft 27 can be inserted into the bearing through holes 30, 30 from the front edge portion are formed at the front edge portion as the outer edge of 7 a. The width of the notches 31, 31 in the direction orthogonal to the insertion direction, that is, the opening width L1, is set to be narrower than the shaft diameter L2 of the pedal support shaft 27, and the narrow notches 31, 3 are narrow.
1, flat portions having a thickness L3 wider and smaller than the shaft diameter L2 of the pedal support shaft 27 are provided at two places on the left and right sides of the pedal support shaft 27 so that the pedal support shaft 27 can be inserted into the bearing through holes 30 and 30. The parts 32, 32 are press formed. Further, as shown in FIGS. 4 and 5 (a) and (c), a pair of right and left flat portions 3 is provided at the right side of the flat portion 32 on the right side.
4 in a state of forming a pair even before and after in the plane direction along
A small projection 33 # as one projection is press-formed.
Further, a second notch 34 is formed at a position on the back side of the bearing through holes 30 with respect to the side where the notches 31 are provided. When the pedal support shaft 27 is moved laterally after the wide flat portion 34 is inserted into the bearing through-holes 30, 30, the second cutout portion 34 is located at the inner side of the flat portion 34. Are formed so as not to interfere with the support portions 7a, 7a.
3 are notched in a size that does not interfere with the support portion 7a when the pedal support shaft 27 moves laterally.

According to the above configuration, assembling for supporting the pedal support shaft 27 to the support portions 7a, 7a in the use posture is shown in FIG.
As shown in (a) and (b), the posture of the pedal support shaft 27 is set so that the flat portions 32, 32 can be inserted into the notches 31, 31, and the flat portions 32, 32 are cut out.
1 and 31, the pedal support shaft 27 is inserted until it reaches the bearing through-holes 30 and 30 of the support portions 7a and 7a.
As shown in FIG. 5C, the left small projection 33, 33 of the pair of left and right small projections 33 # is located on the left side of the support portion 7a, and the right small projections 33, 33 are supported. After being positioned on the right side of the portion 7a, the flat portion 32 is rotated such that the flat surface of the flat portion 32 is in a direction orthogonal to the step surface of the step portion 7. This posture is the standby posture when the accelerator pedal 10 is used, and
Even when the accelerator pedal 10 is depressed most, the small projections 33 # can be connected to the notches 31 and the second
It is set so as not to swing to the angle range in which the notch 34 is formed. Therefore, within the angular range of the pedal arm 26 between the standby posture and the most depressed posture of the accelerator pedal 10 in which the non-depressed operation posture is elastically urged by the winding spring 35 described later,
The small projection 33 # is restricted from contacting the support portion 7a in either the left or right direction in the left and right direction, whereby the accelerator pedal 10 in the used state is held at a fixed position in the left and right direction. It is designed not to shift sideways.

Further, as shown in FIGS. 2 to 4, a helical spring 35 is jacketed on the left side of the flat portion 32 on the left side of the pedal support shaft 27, and both ends of the helical spring 35 are attached. The lower surface of the step portion 7 and the operation arm 28 are locked so that the force elastically urges the accelerator pedal 10 toward the standby posture. As shown in FIG. 2, the free end of the operation arm 28 abuts from below on a lower free end 36a of a swing arm 36 supported by the body 3 so as to be swingable about the horizontal axis Q3. Since the operating rod 37 linked to the operating lever of the governor is pivotally supported by the lower free end 36a of the swing arm 36,
When the accelerator pedal 10 is depressed, the operation arm 36 pushes the lower free end portion 36a of the swing arm 36 toward the side that pushes up the operation rod 37, as shown by a two-dot chain line in FIG. The speed is increased according to the amount of depression. The steering handle 3 of the boarding operation unit 5
A manual accelerator lever 39 is provided on the right side of 8. The manual accelerator lever 39 is interlocked with the manual accelerator lever 39 so that the more the manual accelerator lever 39 is operated backward around the longitudinal axis, the more the speed increase operation is performed. An arm portion 41 protruding from the lower end of the rotation operation shaft 40 is an upper free end portion 36 b of the swing arm 36.
To the rear side.

As a structure for supporting the main clutch pedal 8 and both side brake pedals 9L and 9R, a structure utilizing a cylindrical boss 12 provided between left and right side walls 11L and 11R of the main frame has been described above. As shown in FIG. 10 and FIG.
Bearings 43, 43 made of a POM material, which is an engineering plastic, are provided in the through holes 42, 42 for supporting the shafts L, 11R.
As described above, the brake operation shaft 13 integrated with the left side brake pedal may be inserted through the bearings 43 and 43 to support the same. Here, bearings 43 and 4
The through-holes 42, 42 and the mounting portions of the bearings 43, 43 in the through-holes 42, 42 are formed into oval-shaped, different-diameter shapes so that the 3 is prevented from rotating with respect to the through-holes 42, 42. ing. With this configuration, it is not necessary to perform welding or the like to the main frame 11 to provide a support structure for the brake operation shaft 13, so that manufacturing costs can be reduced. 10 and FIG.
1 is given the same reference numeral for a structure similar to the above-described structure. The boss 44 at the base end of the left side brake pedal 9L and the boss 19 at the base end of the main clutch pedal 8 are provided.
Thus, the left and right bearings 43 are restricted in position from the left and right sides.
Never leave.

[Another Embodiment] As shown in FIG. 9, a pair of left and right supporting portions 7a, 7a for supporting a pedal support shaft 27 of the accelerator pedal 10 are provided, and a pair of left and right flat portions of the pedal support shaft 27 are provided. 32,
32 is a bearing through hole 30 for each of the support portions 7a, 7a.
After inserting it through the notch (not shown)
After being moved to the right side, the lateral movement of the pedal support shaft 27 in a state where the pedal support shaft 27 is rotated to an angular posture (the posture shown in FIG. 9 corresponds to a standby posture) in which the accelerator pedal 10 can be depressed is controlled. Projections 33, 33 may be provided on the right and left sides of the left and right flat portions 32, 32, respectively. In this case, a second notch (not shown) for passing a projection when the pedal support shaft 27 moves laterally is provided in the bearing through hole 30 of the left support portion 7a. In addition, since the lateral movement of the pedal support shaft 27 is regulated by the opposing surfaces of the support portions 7a and 7a being in contact with the projections 33 #, the distance between the left and right projections 33 is Are set slightly smaller than the distance between the support portions 7a, 7a.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an agricultural tractor.

FIG. 2 is a longitudinal sectional side view showing an installation portion of an accelerator pedal and the like.

FIG. 3 is a vertical cross-sectional front view showing a position where each pedal of the agricultural tractor is installed.

FIG. 4 is a longitudinal sectional front view showing an accelerator pedal.

FIG. 5 is a perspective view (a) showing a state in which a pedal support shaft is inserted into a support portion, a longitudinal side view (b), and a perspective view showing a state in which the position of the pedal support shaft is regulated on the support portion in the left and right directions (c). )

FIG. 6 is an expanded sectional view showing a support structure of a brake pedal and a main clutch pedal.

FIG. 7 is a longitudinal sectional side view showing a pedal stopper structure (a).
And longitudinal front view (b) and bottom view (c)

FIG. 8 is a perspective view showing a main frame.

FIG. 9 is a longitudinal sectional front view showing an accelerator pedal according to another embodiment.

FIG. 10 is an exploded sectional view showing a support structure of a brake pedal and a main clutch pedal according to another embodiment.

FIG. 11 is an exploded perspective view showing a bearing structure of a brake operation shaft according to another embodiment.

[Explanation of symbols]

 3 Body 7 Step portion 7a Support portion 25 Depressed portion 26 Pedal arm 27 Pedal support shaft 28 Operation arm 30 Bearing through hole 31 Notch portion 32 Flat portion 33 Projection 34 Second notch portion

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsutomu Inokuchi 64 Ishizukita-cho, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (2)

[Claims] 1. A pedal arm having a stepped portion connected to one end thereof, a pedal support shaft for rotatably supporting the pedal arm on a support portion provided below a step portion of the body, and an operated member. An operation arm linked to a mechanism is integrally formed, and a flat portion having a thickness wider than the shaft diameter and smaller than the shaft diameter is press-formed on the pedal support shaft, and the pedal support shaft is provided at a side of the flat portion. A notch that connects the through-hole for bearing of the pedal support shaft and the outer edge of the support portion in the support portion is provided, and the flat portion of the pedal support shaft can be inserted. A second portion, which is formed to have a width smaller than the shaft diameter of the pedal support shaft and allows the protrusion to pass through when the pedal support shaft is moved in a lateral direction at a phase different from the stepping operation angle range of the stepping portion. Notch A pedal structure of a working machine provided in the bearing through hole. 2. The pedal structure of a working machine according to claim 1, wherein said support portion is cut out from said step portion and bent.