JP2017033081A - Pedal structure of construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of an opening without interrupting motions of a pedal operation.SOLUTION: A connection member 40 connects a pedal 20 and an internal mechanism 30 to each other and is rotatable relative to a floor 10 around a rotation axis 40a. The connection member 40 has a circular part 50 to pass through an opening 11. The circular part 50 is in the shape of an arc with a rotation axis 40a as the center point when is viewed from the direction of the rotation axis 40a. The circular part 50 is extended over a range A from a lower cut part 51 to ah upper cut part 53.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pedal structure for a construction machine.

  For example, Patent Document 1 discloses a conventional pedal structure. In the pedal structure described in the document (see FIGS. 1 to 3 and paragraph [0014]), an accelerator pedal (hereinafter referred to as a pedal) is disposed above a floor surface (hereinafter referred to as “floor”). This pedal rotates with the lower end of the pedal as the center of rotation. This pedal is supported by an arc-shaped link protruding from the floor (see paragraph [0016] of the same document).

JP 2007-109162 A

  In the technique described in this document, since the link passes through the floor, an opening is formed in the floor. In this technique, the relative positional relationship between the portion of the link that is passed through the opening and the floor changes according to the pedal operation amount (depression amount). Therefore, it is necessary to secure a large (wide) opening so that the movement of the pedal is not hindered so that the link and the floor do not interfere with each other. However, when the opening becomes large, noise easily enters the cabin from the outside of the cabin (operator's cab) via the opening, and the noise inside the cabin may be deteriorated. In addition, if the opening becomes large, cold air or hot air (hot air) can easily enter the cabin through the opening from the outside of the cabin, which may hinder the effectiveness of the air conditioning equipment (air conditioner) inside the cabin. is there.

  Therefore, an object of the present invention is to provide a pedal structure for a construction machine that can reduce the opening without obstructing the movement of the pedal operation.

  A pedal structure for a construction machine according to the present invention includes a floor in which an opening is formed, a pedal disposed above the floor, an internal mechanism disposed below the floor, and a connecting member. Prepare. The connecting member connects the pedal and the internal mechanism, and is rotatable about a rotation axis with respect to the floor. The connecting member includes an arcuate portion that passes through the opening. The arcuate portion is arcuate with the rotation axis as a center point when viewed from the direction of the rotation axis. The arcuate portion is formed from a lower cutting portion, which is a cutting portion of the connecting member by the floor when the pedal operation amount is minimum, from the floor cutting portion of the connecting member by the floor when the pedal operation amount is maximum. It is provided over a range up to the upper cut portion which is a cut portion.

  With the above configuration, the opening can be made small without hindering movement of the pedal operation.

1 is an overall view of a pedal structure 1 and shows a state in which an operation amount of a pedal 20 is minimum. It is a figure which shows the connection member 40 etc. which are shown in FIG. FIG. 3 is a view corresponding to FIG. 2 when the operation amount of the pedal 20 shown in FIG. 2 is maximum. FIG. 3 is an end view (schematic diagram) of the F4-F4 line cut portion of FIGS. 1 and 2. FIG. 3 is a diagram corresponding to FIG. 1 of a second embodiment.

(First embodiment)
The pedal structure 1 of the construction machine according to the first embodiment shown in FIG. 1 will be described with reference to FIGS.

  The pedal structure 1 is provided in a cabin (operator's cab) of a construction machine. The construction machine provided with the pedal structure 1 is, for example, a crane, for example, a mobile crane. The pedal structure 1 includes a floor 10, a pedal 20, an internal mechanism 30, and a connecting member 40.

  The floor 10 is a cabin floor (cabin floor). The floor 10 has a plate shape (floor plate). More specifically, the floor 10 has a plate shape at least around the opening 11 (described below). The thickness direction of the floor 10 is the vertical direction (may be substantially the vertical direction). A lower surface of the floor 10 is a lower surface 10b, and an upper surface is an upper surface 10t. An opening 11 is formed in the floor 10.

  The opening 11 is a through hole through which the connecting member 40 is inserted (inserted). The opening 11 communicates the space above the floor 10 and the space below the floor 10. Of the floor 10, a portion that forms the opening 11 and surrounds the opening 11 (inner surface, inner periphery) is referred to as an opening inner surface 11 a. The opening 11 is configured (arranged and formed) so that the connecting member 40 does not interfere with the opening inner surface 11a.

  The pedal 20 is a portion (operating pedal) that is depressed by the operator's foot in order for the operator to operate the construction machine, and is a portion that constitutes a stepping grounding surface. The pedal 20 is disposed above the floor 10 (outside the floor 10). The pedal 20 has, for example, a plate shape (including a substantially plate shape). The pedal 20 is a brake pedal, for example, a brake pedal for braking the crane's suspended load. More specifically, the pedal 20 holds the suspended load so that the suspended load does not fall, and performs the falling motion of the suspended load. A brake pedal for braking. The pedal 20 may be a brake pedal for braking a running construction machine (for example, a wheel crane) or an accelerator pedal for accelerating the running of the construction machine.

  The operation amount (operation force, stepping amount, stepping force) of the pedal 20 is transmitted to the internal mechanism 30 (internal structure, internal device) via the connecting member 40. The internal mechanism 30 is disposed below the floor 10 (inside the floor 10). The internal mechanism 30 is, for example, a mechanism that converts the operation amount of the pedal 20 into hydraulic pressure. The internal mechanism 30 includes a frame 31, a hydraulic valve 32, a link 33, a reaction force spring 34, a first stopper 35, and a second stopper 36.

The frame 31 is fixed to the floor 10. Each component of the internal mechanism 30 (excluding the frame 31) is attached to the frame 31.
The hydraulic valve 32 converts the operation amount of the pedal 20 into hydraulic pressure, and transmits the hydraulic pressure to an operation target (for example, a brake or a brake control circuit) by the pedal 20.
The link 33 transmits the movement of the connecting member 40 to the hydraulic valve 32. More specifically, the link 33 converts the rotational motion (described below) of the connecting member 40 into a translational motion, and transmits the translational motion to the hydraulic valve 32.
The reaction force spring 34 returns the depressed pedal 20 (see FIG. 3) to the position (original position) of the pedal 20 when the pedal 20 is not depressed. The reaction force spring 34 is attached to, for example, the connecting member 40 (more specifically, the first internal arm portion 41 (described below)). The reaction force spring 34 may be attached to another component (a component of the internal mechanism 30) such as the link 33, for example.

  The first stopper 35 restricts the rotation of the connecting member 40 and the pedal 20 around the rotation shaft 40a (described below) (the same applies to the second stopper 36). The first stopper 35 rotates the pedal 20 in a direction in which the operation amount of the pedal 20 decreases (counterclockwise in FIG. 1) when the operation amount of the pedal 20 is minimum (when the pedal 20 is not depressed). regulate. The first stopper 35 hits the connecting member 40 (more specifically, the first internal arm portion 41 (described below)) when the operation amount of the pedal 20 is minimum.

  When the operation amount of the pedal 20 is maximum (see FIG. 3), the second stopper 36 restricts the rotation of the pedal 20 in the direction in which the operation amount of the pedal 20 increases (clockwise in FIG. 1). The second stopper 36 contacts the connecting member 40 (more specifically, the second inner arm portion 42 (described below)) when the operation amount of the pedal 20 is maximum.

  The connecting member 40 connects the pedal 20 and the internal mechanism 30 and transmits the operation amount of the pedal 20 to the internal mechanism 30. The connecting member 40 is disposed so as to penetrate the floor 10 and is passed through the opening 11. The shape of the connecting member 40 (pedal arm) is a substantially linear shape or a shape that combines a substantially linear shape, and more specifically, for example, a shape that combines a curved shape and a linear shape. The connecting member 40 is rotatable with respect to the floor 10 about the rotation shaft 40a. Since the pedal 20 is fixed to the connecting member 40, the pedal 20 and the connecting member 40 are integrally rotated about the rotation shaft 40a. The rotating shaft 40a is fixed with respect to the floor 10, in other words, the relative position of the rotating shaft 40a with respect to the floor 10 is constant. The rotating shaft 40 a is disposed below the floor 10 and is fixed to the frame 31. The direction of the rotating shaft 40a (the direction in which the rotating shaft 40a that is a straight line extends) is the horizontal direction.

  The connecting member 40 includes a first inner arm portion 41, a second inner arm portion 42, an arcuate portion 50, and a pedal attachment portion 45. The constituent elements of the connecting member 40 are fixed to each other (fixed integrally or fixed separately). Specifically, for example, the second inner arm portion 42, the arc-shaped portion 50, and the pedal mounting portion 45 are configured integrally and configured to be continuously connected. The second inner arm portion 42 and the like and the first inner arm portion 41 are configured as separate bodies and are fixed to each other. Each component of the connecting member 40 has a substantially linear shape, and more specifically, a curved shape or a straight shape.

  The first inner arm portion 41 is disposed below the floor 10. The first inner arm portion 41 extends radially outward from the rotation shaft 40a with the rotation shaft 40a as the center. The “radial direction centered on the rotation shaft 40a” is the diameter direction of a circle centered on the rotation shaft 40a when viewed from the direction of the rotation shaft 40a (the same applies hereinafter). A link 33 and a reaction force spring 34 are attached to the first inner arm portion 41.

  The second inner arm portion 42 is disposed below the floor 10 and extends outward from the rotation shaft 40a in the radial direction around the rotation shaft 40a.

  A pedal 20 is attached to the pedal attachment portion 45, and more specifically, the pedal 20 is fixed. The pedal mounting portion 45 is fixed to the arc-shaped portion 50. The pedal attachment portion 45 is disposed along the pedal 20, and more specifically, is disposed in parallel (including substantially parallel) to the pedal 20. The pedal attachment portion 45 is linear (may be substantially linear) when viewed from the direction of the rotation shaft 40a. The pedal attachment portion 45 extends in the radial direction (or substantially radial direction) about the rotation shaft 40a. A central portion in the longitudinal direction of the pedal mounting portion 45 viewed from the direction of the rotation shaft 40a is defined as a longitudinal central portion 45c.

  The arc-shaped portion 50 passes through the floor 10 and passes through the opening 11. The arcuate portion 50 is connected to the second inner arm portion 42 and the pedal attachment portion 45. More specifically, the lower end portion of the arc-shaped portion 50 is connected to the end portion (tip portion) of the second inner arm portion 42 on the side far from the rotation shaft 40a. The upper end portion of the arc-shaped portion 50 is connected to the end portion of the pedal attachment portion 45 on the side close to the rotating shaft 40a.

  The arcuate portion 50 has an arcuate shape with the rotation axis 40a as the center point when viewed from the direction of the rotation axis 40a. More specifically, each of the inner peripheral portion 50i and the outer peripheral portion 50o of the arc-shaped portion 50 has an arc shape centered on the rotation shaft 40a when viewed from the direction of the rotation shaft 40a. The inner peripheral part 50i is an end part of the arcuate part 50 on the side close to the rotating shaft 40a. The outer peripheral part 50o is an end part of the arcuate part 50 on the side far from the rotating shaft 40a.

  As shown in FIG. 2, the arcuate portion 50 is provided over at least the range A from the lower cut portion 51 (below) to the upper cut portion 53 (below) (in the entire range of the range A). More specifically, the arc-shaped portion 50 is provided at least over a range A from the lower cut portion upper surface 51t (described below) to the upper cut portion lower surface 53b (described below). The arc-shaped portion 50 may be provided outside the range A (upper side or lower side of the range A) (see the second embodiment).

  The arcuate portion 50 is disposed in a range B on the side closer to the rotation shaft 40a than the central portion 45c in the longitudinal direction of the pedal attachment portion 45 (in the radial direction centering on the rotation shaft 40a). More specifically, the arc-shaped portion 50 is disposed only in the range B.

  The size of the gap (horizontal gap) between the arcuate portion 50 and the opening inner surface 11a is preferably within a range from a predetermined lower limit (for example, 1 mm) to a predetermined upper limit (for example, 10 mm). When this gap is set to the upper limit value or less, it is difficult for noise to enter the cabin through the opening 11 from the outside of the cabin, and the noise inside the cabin can be reliably suppressed. Further, if this gap is set to the upper limit value or less, it is difficult for cold air or hot air (hot air) to enter the cabin through the opening 11 from the outside of the cabin, and the effectiveness of the air conditioning equipment inside the cabin can be improved (the gap is reduced). Compared to exceeding the upper limit). Further, if this gap is less than the lower limit value, there is a risk that a small stone or the like bites into this gap and the pedal 20 becomes difficult to move (or stops moving). On the other hand, this problem can be suppressed by setting this gap to be equal to or greater than the lower limit (clearing the gap slightly).

  The lower cutting part 51 is a cutting part (virtual cutting part, the same applies hereinafter) of the connecting member 40 by the floor 10 when the operation amount of the pedal 20 is minimum. The “cutting portion of the connecting member 40 by the floor 10” is a portion of the connecting member 40 surrounded by the opening inner surface 11a. The lower cutting part 51 includes a lower cutting part lower surface 51b and a lower cutting part upper surface 51t. The lower cut portion lower surface 51b is a lower end surface of the lower cut portion 51. More specifically, the cut surface (virtual cut) of the connecting member 40 by the lower surface 10b of the floor 10 when the operation amount of the pedal 20 is minimum. Surface, the same shall apply hereinafter). The “cut surface of the connecting member 40 by the lower surface 10 b” is a portion of the connecting member 40 surrounded by the lower end portion of the opening inner surface 11 a. The lower cut portion upper surface 51t is the upper end surface of the lower cut portion 51. More specifically, the lower cut portion upper surface 51t is a cut surface of the connecting member 40 by the upper surface 10t of the floor 10 when the operation amount of the pedal 20 is minimum. The “cut surface of the connecting member 40 by the upper surface 10t” is a portion of the connecting member 40 surrounded by the upper end portion of the opening inner surface 11a.

  As shown in FIG. 3, the upper cutting portion 53 is a cutting portion of the connecting member 40 by the floor 10 when the operation amount of the pedal 20 is maximum. The upper cutting part 53 includes an upper cutting part lower surface 53b and an upper cutting part upper surface 53t. The upper cut portion lower surface 53b is a lower end surface of the upper cut portion 53, and more specifically, a cut surface of the connecting member 40 by the lower surface 10b of the floor 10 when the operation amount of the pedal 20 is maximum. The upper cut portion upper surface 53t is an upper end surface of the upper cut portion 53, and more specifically, a cut surface of the connecting member 40 by the upper surface 10t of the floor 10 when the operation amount of the pedal 20 is maximum.

(Effect 1)
The effects of the pedal structure 1 shown in FIG. 1 are as follows.
The pedal structure 1 includes a floor 10 in which an opening 11 is formed, a pedal 20 that is disposed above the floor 10, an internal mechanism 30 that is disposed below the floor 10, and a connecting member 40. Prepare. The connecting member 40 connects the pedal 20 and the internal mechanism 30 and is rotatable with respect to the floor 10 about the rotating shaft 40a. The connecting member 40 includes an arcuate portion 50 that passes through the opening 11.
[Configuration 1] The arcuate portion 50 has an arcuate shape with the rotation axis 40a as a center point when viewed from the direction of the rotation axis 40a. As shown in FIG. 2, the arcuate portion 50 is provided over a range A from the lower cut portion 51 to the upper cut portion 53. The lower cutting part 51 is a cutting part of the connecting member 40 by the floor 10 when the operation amount of the pedal 20 is the minimum. As shown in FIG. 3, the upper cutting portion 53 is a cutting portion of the connecting member 40 by the floor 10 when the operation amount of the pedal 20 is maximum.

  The pedal structure 1 shown in FIG. 1 includes the above [Configuration 1]. Therefore, when the pedal 20 is operated and the connecting member 40 rotates around the rotation shaft 40a, the floor 10 cuts the connecting member 40 (the lower cutting portion 51 in FIG. 2 and the upper cutting portion 53 in FIG. 3). The relative position of the floor 10 (opening inner surface 11a) is substantially constant. This relative position is almost always maintained regardless of the operation amount of the pedal 20 (specifically, the state shown in FIG. 4 is maintained). Therefore, the opening part 11 can be made small, without inhibiting the operation | movement movement of the pedal 20 shown in FIG. More specifically, the gap between the floor 10 (opening inner surface 11a) and the connecting member 40 can be reduced. Since this gap can be reduced, it is possible to suppress noise that enters the cabin through the opening 11 from the outside of the cabin. Therefore, noise inside the cabin can be suppressed. In addition, since this gap can be reduced, it is possible to suppress cold air and hot air (hot air) that enter the cabin through the opening 11 from the outside of the cabin. Therefore, the effectiveness of the air conditioning equipment inside the cabin can be improved.

  In addition, in said patent document 1, it is described that a link is circular arc shape (refer paragraph [0016] of the literature). However, the position of the arcuate center is not described. Also, according to FIGS. 1 to 3 of the same document, the center of the arc is below the rotation center of the link and the pedal (the lower end of the pedal). For this reason, when the pedal is operated, the relative position between the cut portion of the link by the floor and the floor changes. Therefore, it is necessary to secure a wide opening, and there is a problem that the gap becomes large.

(Effect 2)
The connecting member 40 includes a pedal attachment portion 45 to which the pedal 20 is attached. The pedal attachment portion 45 is fixed to the arc-shaped portion 50 and is disposed along the pedal 20.
[Configuration 2] The arcuate portion 50 is disposed closer to the rotation shaft 40a (range B) than the central portion 45c in the longitudinal direction of the pedal mounting portion 45 as viewed from the direction of the rotation shaft 40a.

  By the above [Configuration 2], the arc-shaped portion 50 can be made smaller than when the arc-shaped portion 50 is not disposed in the range B. Therefore, the operation amount (stroke) of the arcuate portion 50 relative to the floor 10 when the pedal 20 is operated can be reduced. Therefore, biting of pebbles and the like in the gap between the floor 10 (opening inner surface 11a) and the arcuate portion 50 can be suppressed.

(Second Embodiment)
With reference to FIG. 5, the difference with 1st Embodiment is demonstrated about the pedal structure 201 of 2nd Embodiment. In addition, about the common point with 1st Embodiment among the pedal structures 201 of 2nd Embodiment, the code | symbol same as 1st Embodiment was attached | subjected and description was abbreviate | omitted.

  The arc-shaped portion 250 is disposed on a side farther from the rotation shaft 40a than the arc-shaped portion 50 (see FIG. 1) of the first embodiment (outside in the radial direction centering on the rotation shaft 40a). The upper end portion of the arc-shaped portion 250 is connected between the end portion of the pedal attachment portion 45 on the side close to the rotation shaft 40a and the central portion 45c in the longitudinal direction.

(Modification)
Each of the above embodiments may be variously modified.
For example, in the above embodiment, the internal mechanism 30 shown in FIG. 1 is a mechanism that converts the operation amount of the pedal 20 into hydraulic pressure, but the internal mechanism 30 converts the operation amount of the pedal 20 into, for example, an electrical signal or the like. It may be a mechanism. Further, for example, the internal mechanism 30 may not be provided with a mechanism for transmitting force, and may be provided with only a sensor for detecting the operation of the second internal arm portion 42.
Some of the components of each of the above embodiments may not be provided. For example, the link 33 may not be provided. The link 33 is provided as necessary.
The arc-shaped portion 50 shown in FIG. 2 is arranged only within the range B in each of the above embodiments, but only a part of the arc-shaped portion 50 may be arranged within the range B, The entire arcuate portion 50 may be disposed outside the range B.

DESCRIPTION OF SYMBOLS 1,201 Pedal structure 10 Floor 11 Opening part 20 Pedal 30 Internal mechanism 40 Connecting member 40a Rotating shaft 45 Pedal attachment part 45c Longitudinal direction center part 50, 250 Arc-shaped part 51 Lower cut part 53 Upper cut part

Claims (2)

A floor formed with an opening,
A pedal disposed above the floor;
An internal mechanism disposed below the floor;
A connecting member that connects the pedal and the internal mechanism and is rotatable about a rotation axis with respect to the floor;
With
The connecting member includes an arc-shaped portion that is passed through the opening,
The arcuate portion is arcuate centered on the rotation axis when viewed from the direction of the rotation axis;
The arcuate portion is formed from a lower cutting portion, which is a cutting portion of the connecting member by the floor when the pedal operation amount is minimum, from the floor cutting portion of the connecting member by the floor when the pedal operation amount is maximum. Provided over the range up to the upper cutting part which is the cutting part,
Construction machinery pedal structure. The construction machine pedal structure according to claim 1,
The connecting member includes a pedal attachment portion to which the pedal is attached,
The pedal mounting portion is fixed to the arc-shaped portion and arranged along the pedal,
The arcuate portion is disposed closer to the rotation shaft than the central portion in the longitudinal direction of the pedal mounting portion as viewed from the direction of the rotation shaft.
Construction machinery pedal structure.