JP2005222330A - Pedal device of work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the malfunction of a device to be operated by pedals formed so as to perform swinging operations right and left in their non-use. <P>SOLUTION: A support stay 37 supported so as to be freely rotatable around a longitudinal shaft 38 is formed with pedals 26 and 27 so that the pedals 26 and 27 can perform swinging operations right and left, and the pedals 26 and 27 are supported so as to be freely rotatable by the support stay 37 around a horizontal shaft 39 so that the attitudes of the pedals 26 and 27 can be changed to use attitudes and non-use attitudes rotated from the use attitudes to the front side around the horizontal shaft 39, and a main body 7 side is formed with a support member 62 for regulating the right and left swinging operations of the pedals 26 and 27 when the pedals 26 and 27 are placed and supported in their non-use attitudes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pedal device for a work machine such as a backhoe.

Conventionally, a swivel base is provided on a traveling device so as to be turnable around a vertical axis, and a work device including a boom, an arm, a bucket, and the like is provided at a front portion of the swivel base, and a driver's seat is provided at the rear of the work device. There is a backhoe.
The boom of the work device is supported by a swing bracket supported by a swivel base so that it can swing left and right around a vertical axis, and the swing bracket is swung left and right by a swing cylinder. This swing cylinder is operated by depressing a swing pedal provided in front of the driver's seat.
JP 2002-294552 A

The swing pedal is supported so as to be able to swing back and forth around the left and right axis, and can be retracted so that it cannot be stepped on when not in use.
On the other hand, a swing pedal is considered in which the swing pedal is provided on a support stay that is supported so as to be rotatable about the front and rear axes, and is swingable left and right. In the swing pedal, the swing pedal is supported on the support stay so as to be rotatable around the left and right axes, and can be swung away from the swing position when not in use as in a conventional swing pedal. There is a possibility that a foot is put on the pedal and the swing pedal is swung left and right to cause the swing cylinder to malfunction.

In addition, it is conceivable to provide a cover that covers the swing pedal and prevent the swing pedal from malfunctioning with this cover, but there are cases in which malfunction occurs depending on how the pedal is depressed even if the cover is installed.
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to prevent malfunction when a device operated by a pedal that is swung left and right is not used.

The technical means taken in order for the present invention to achieve the above object is that a pedal is provided on a support stay supported so as to be rotatable about a front-rear axis so that the pedal can be swung left and right. The pedal is supported by the support stay so as to be rotatable about the left and right axis, and the posture can be changed between the use position and the non-use position in which the pedal is rotated forward from the use position around the left and right axis, A support member is provided on the machine body side for restricting the left-right swinging operation of the pedal by placing and supporting the pedal in a non-use posture.
As a result, it is possible to prevent malfunction of a device operated by a pedal swinging left and right.

The pedal may be provided with a hole, and the support member may be provided with a protrusion that fits into the hole in a non-use posture.
As a result, the lateral displacement of the pedal can be prevented and the possibility of malfunction can be reliably suppressed.
Further, it is preferable that the protrusion is provided so as to protrude upward from the hole in a non-use posture of the pedal.
Thereby, for example, when the pedal is used as an operator's footrest member in a non-use posture, it is possible to prevent the operator's feet from slipping.

In addition, a mat is laid on the upper surface of the step constituting the floor of the aircraft, and a pedal is disposed on the upper side of the mat. The mat is divided into a portion where the pedal is disposed and other main portions. It should be divided.
Thereby, the main part of the mat can be easily removed and cleaned.

  According to the present invention, it is possible to prevent a malfunction of a pedal that is swung left and right.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 2 to FIG. 4, reference numeral 1 denotes a backhoe exemplified as a work machine. The backhoe 1 is rotatable (rotatable) about a lower traveling body 2 and a vertical pivot axis X on the traveling body 2. A revolving unit 3 mounted on the revolving unit 3 and a working device 4 provided on the revolving unit 3.
The traveling body 2 is configured by a crawler traveling device that travels by circulating a pair of left and right crawler belts 5 by a hydraulic motor, and includes a dozer 6 at the front.
The swivel body 3 includes a swivel base (airframe) 7 supported by the traveling body 2 so as to be turnable, a driver seat 8 provided on the swivel base 7, and an engine, a radiator, and a fuel tank mounted on the swivel base 7. , Various kinds of equipment such as a hydraulic oil tank, and a bonnet 9 that covers them, and a cabin 10 that forms a cab.

The swivel base 7 is formed by fixing reinforcing ribs, brackets, and the like by welding or the like on a swivel board 12 that is supported by a frame of the traveling body 2 so as to swivel to the left and right via a swivel bearing 11 and that is swiveled by a swivel motor. The swivel frame has a rear cover 13 having a function as a counterweight for balancing the weight with the work device 4 at the rear of the swivel frame, and the left and right sides and the front side of the swivel frame are covered with a cover member. ing.
In addition, an engine, a radiator, and the like are mounted on the rear portion of the swing frame, which are covered by a main bonnet portion 14 of the bonnet 9, and a fuel tank, a radiator, and the like are mounted on the right side portion of the swing frame. These are covered by a side bonnet portion 15 extending forward from the right side of the main bonnet portion 14 of the bonnet 9.

The main bonnet portion 14 and the side bonnet portion 15 of the bonnet 9 have opening / closing covers 14A and 15A for inspecting the inside.
Further, a step 28 constituting the upper surface of the swivel base 7 is provided in a portion where the bonnet 9 on the upper surface side of the swivel frame is not provided.
A pair of upper and lower support brackets 16 are provided at the front portion of the swivel base 7 so as to protrude forward and are offset from the center in the left-right direction of the swivel base 7 to the right side (one side on the left and right sides). The rear side of 17 is supported so as to be able to swing left and right around the vertical axis.

The working device 4 includes a boom 18 whose base is pivotally connected to the upper portion of the swing bracket 17 so as to be swingable about a horizontal axis, and swingable about a horizontal axis on the distal end side of the boom 18. The arm 19 is pivotally connected to the arm 19, and the bucket 20 is pivotally connected to the distal end side of the arm 19 so as to be swingable about a horizontal axis.
The swing bracket, the boom 18, the arm 19, and the bucket 20 are oscillated by a swing cylinder, a boom cylinder 21, an arm cylinder 22, and a bucket cylinder 23, each of which is a hydraulic cylinder.

Further, an external hydraulic pressure take-out portion for operating a hydraulic actuator that is separately attached to the backhoe 1 and used is provided on the distal end side of the arm 19 of the work device 4 or the front surface of the swivel base 7.
The driver's seat 8 is arranged on the left side of the side bonnet portion 15 in the middle in the front-rear direction of the swivel base 7 and on the left side of the center of the swivel base 7 in the left-right direction. The tables 24L and 24R are arranged.
Further, in front of the driver's seat 8, a pair of left and right traveling levers 25 for operating the hydraulic motors of the traveling body 2 are arranged so that the left and right crawler belts 5 circulate separately. A swing pedal 26 that swings the swing bracket 17 is disposed, and an SP pedal 27 that operates a hydraulic actuator connected to the external hydraulic pressure takeout portion is disposed on the left side of the left and right traveling lever 25.

The left and right control tables 24L and 24R are provided with operation levers 30L and 30R. For example, the operation lever 30R of the right control table 24R can operate the boom cylinder 21 and the bucket cylinder 23, and the left control table 24R. The operation lever 30L of 24L can operate the turning motor and the arm cylinder 22.
As shown in FIGS. 5 and 6, a control valve B and a hydraulic pressure for controlling hydraulic equipment (hydraulic actuators such as a hydraulic cylinder and a hydraulic motor) mounted on the backhoe 1 are disposed on the left side of the front portion of the bottom of the swivel base 7. A control valve CV is provided in which a switching valve K or the like connected to the pump is connected in one direction.

Each of the valves B1 to 9 and K constituting the control valve CV is composed of a direct acting spool type switching valve, and is arranged and connected in a direction perpendicular to the operation direction (moving direction) of the spool, and is integrated. Yes.
Further, the control valve CV is controlled in such a manner that the operation direction of the spool S of each of the valves B1 to 9 and K becomes the left and right direction and the arrangement direction of the valves B1 to 9 and K coincides with the front and rear direction. Ports such as a pressure oil supply / return port formed in the valves B1 to B9 and a pump port for inflowing pressure oil from the hydraulic pump formed in the switching valve K are arranged to face upward.

  The control valves B1 to 9 will be described in order from the front. B1 is a turning control valve for controlling a turning motor for turning the swivel base 7, and B2 is a dozer control for controlling a dozer cylinder for moving the blade of the dozer 6 up and down. B3 is a swing control valve that controls a swing cylinder that swings the swing bracket 17, B4 is an SP control valve that controls a hydraulic attachment mounted instead of the bucket 20, for example, and B5 is an arm cylinder B6 is a left travel control valve for controlling the left hydraulic motor of the traveling body 2, B7 is a right travel control valve for controlling the right hydraulic motor of the traveling body, B8 Is a boom control valve for controlling the boom cylinder 21, and B 9 is a bucket control valve for controlling the bucket cylinder 23.

The swing pedal 26 and the SP pedal 27 are interlockedly connected to the swing control valve B3 and the SP control valve B4 via the interlocking connection mechanism 32, respectively.
As shown in FIGS. 5, 6, 7, 8, and 9, the control valve CV is mounted on a revolving board 12 and fixed to a fixed mounting member 33 by a bolt or the like. It is attached to the upper rear left side.
A support frame 35 is erected and fixed to the front portion of the mounting plate 34, and a support stay 37 is supported by a support plate 36 fixed to the support frame 35 so as to be rotatable around a front and rear shaft 38. 37, front portions of the swing pedal 26 and the SP pedal 27 are supported around the left and right axis 39 so as to be swingable back and forth.

The support frame 35 includes a front plate 41, a pair of left and right side plates 42 disposed on the back side of the front plate 41 and fixed to the front plate 41, and a vertical direction on the rear end side of the left and right side plates 42. It is provided with a connecting plate 43 that is disposed in the middle and connects the left and right side plates 42, and a support bracket 44 is provided on each of the left and right side plates 42 so as to protrude outward in the left and right directions. The support plates 36 are fixed to the left and right support brackets 44 so as to protrude upward.
A front and rear shaft 38 having a longitudinal axis is fixed to the left and right support plates 36 so as to protrude rearward, and a cylindrical member 45 is fitted around the front and rear shaft 38 so as to be rotatable around the axis.

The support stay 37 is formed in an L shape from a vertical wall 46 and an upper wall 47 extending forward from the upper end of the vertical wall 46, and the lower end side of the support stay 37 is fixed to the cylindrical member 45. Thus, the support stay 37 is supported by the support plate 36 so as to be swingable in the left-right direction around the front-rear shaft 38.
A support cylinder 48 having a horizontal axis is provided on the front portion of the upper wall 47 of each of the left and right support stays 37.
A cylindrical boss 49 having a horizontal axis is fixed to the front ends of the swing pedal 26 and the SP pedal 27, and the boss 49 of the swing pedal 26 is fixed to the right support stay 37. The left and right shafts 39 that are positioned on both sides and have a lateral axis are inserted into the support cylinder 48 and the left and right bosses 49, so that the swing pedal 26 can swing back and forth around the left and right shafts 39 around the support stay 37. It is supported.

Similarly, the SP pedal 27 is supported on the left support stay 37 so as to be swingable back and forth around the left and right axis 39.
As shown by solid lines in FIGS. 7 and 8, the swing pedal 26 and the SP pedal 27 are in contact with the corner portions of the vertical wall 46 and the upper wall 47 of the support stay 37 and their downward swing is restricted. The use posture is an inclined state that moves downward as it goes rearward. In this use posture, the left and right ones or the other of the pedals 26 and 27 are stepped on, so that the left and right can be swung around the front and rear shaft 38. Has been.

The swing pedal 26 and the SP pedal 27 can be retracted from the use position when not in use by swinging forward from the use posture around the left and right axis 39.
A lever 51 is fixed to the lower surface side of each of the left and right tube members 45, and a support shaft 52 having a vertical axis is erected in the middle in the front-rear direction on the right side of the mounting plate 34. Upper and lower cylindrical bodies 53 are externally fitted to the shaft 52 so as to be rotatable around the axis.
Note that the upper end portion of the support shaft 52 is supported by a support plate 55 fixed to the upper end portion of a support member 54 erected on the mounting plate 34.

A projecting first arm 56 and a projecting second arm 57 on the rear side are fixed to the upper and lower cylinders 53, respectively.
The upper first arm 56 is linked to the lever 51 on the swing pedal 26 side via a first interlocking rod 58, and the upper second arm 57 is connected to the swing control valve B3 via a second interlocking rod 59. The spool S is linked and connected.
The lower first arm 56 is linked to the lever 51 on the SP pedal 27 side via the first interlocking rod 58, and the lower second arm 57 is connected to the SP pedal via the second interlocking rod 59. The control valve B4 is linked to the spool S of the control valve B4.

Therefore, when the swing pedal 26 or the SP pedal 27 is swung left and right, the first and second arms 56 and 57 are swung around the support shaft 52 via the first interlocking rod 58 and are connected via the second interlocking rod 59. Thus, the spool S of the swing control valve B3 or the SP control valve B4 is pushed and pulled.
By means of the lever 51, the first and second interlocking rods 58 and 59, the first and second arms 56 and 57, the support shaft 52, the cylindrical body 53, etc., the swing pedal 26 or the SP pedal 27 and the swing control valve B3 or SP are used. An interlocking connection mechanism 32 that interlocks and connects the control valve B4 is configured.

In the above configuration, the control valve CV, the support frame 35, the support stay 37, the swing pedal 26 and the SP pedal 27, the interlocking connection mechanism 32, and the like are assembled on the mounting plate 34 as a unit. By attaching to the swivel board 12, the assembly can be easily performed.
The swing pedal 26 and the SP pedal 27 are located above the step 28, the control valve CV, the support frame 35, the interlocking coupling mechanism 32, etc. are located below the step 28, and the support plate 36 projects upward from the step 28. It is made into a shape.

A pair of left and right holes 61 are formed in a portion where the operator of the swing pedal 26 and the SP pedal 27 steps with his / her foot.
A support member 62 is disposed in front of the swing pedal 26 and the SP pedal 27. The support member 62 is erected on the support bracket 44 and protrudes upward from the lower surface of the step 28 to the upper side of the step 28. Yes.
A pair of left and right protrusions 63 are formed on the upper ends of the left and right support members 62 so as to protrude upward from the upper surface 62 a of the support member 62.

  The swing pedal 26 and the SP pedal 27 are pivoted forward from the use posture around the left and right axis 39 and placed on the support member 62, whereby the downward rotation thereof is restricted, and this state (non-use posture) 7 and 8, the protrusion 63 is fitted in the hole 61, and the pedals 26 and 27 are in contact with the upper surface 62a of the support member 62 and swing left and right about the front and rear shaft 38. The operation is restricted, so that it is possible to prevent the malfunction of the swing cylinder and the separately provided hydraulic actuator when the pedals 26 and 27 are not used, and the protrusions 63 are fitted into the holes 61 to thereby prevent the pedal 26. , 27 can be prevented from malfunctioning and the malfunction of the swing cylinder or the like can be reliably prevented.

In addition, the pedals 26 and 27 are inclined so as to move upward in the non-use posture, and can be used as an operator's footrest, and as shown in FIG. In the non-use posture, the protrusion 63 protrudes upward from the hole 61. In this non-use posture, the protrusion 63 can prevent the operator's foot from slipping.
As shown in FIGS. 3, 4, and 10, a rubber mat 66 is laid on the upper surface of the step 28 on the front side of the driver's seat 8.

The mat 66 is divided into a sub mat portion 67 corresponding to an arrangement portion of the swing pedal 26, the SP pedal 27, and the travel lever 51, and another main mat portion 68.
If the mat 66 is formed of a single piece, the support stay 37 that supports the pedals 26 and 27, the travel lever 51, and the like protrude from the step 28. Therefore, when the mat 66 is cleaned, the support stay 37 is supported. However, in the mat 66 according to the present embodiment, the middle part of the front portion of the main mat portion 68 is opened forward in the left-right direction. The mat portion 67 is formed so that the sub mat portion 67 fits into the notch portion 69. When the mat 66 is washed, only the main mat portion 68 can be easily removed, and the washing and the like are facilitated. Yes.

  Further, as shown in FIGS. 7, 8, and 11, the sub mat portion 67 is formed with a covering portion 70 that covers the pivot portion of the support stay 37 and the base portion of the supporting member 62. Are formed with a first insertion portion 71 through which the support stay 37 is inserted and a second insertion portion 72 through which the support member 62 is inserted, and from the front end side across the second insertion portion 72 to the first insertion portion 71. A slit 73 is formed, and a U-shaped notch 74 having an open front shape is formed in a portion corresponding to the traveling lever 51, so that the sub mat portion 67 can be attached and detached.

3 is a rear view of a swing pedal 26 and an SP pedal 27. FIG. 1 is a side view of a backhoe 1. FIG. 3 is a plan view of the swivel base 7. FIG. 3 is a side view of the swivel base 7. FIG. It is a top view of arrangement parts, such as a control valve, swing pedal 26, and SP pedal 27. 3 is a front view of a swivel base 7. FIG. FIG. 6 is a side view of the swing pedal 26 and the interlocking connection mechanism 32. It is a side view of SP pedal 27 and interlocking connection mechanism 32. 3 is a plan view of a swing pedal 26 and an SP pedal 27. FIG. It is a top view of mats 66 grade. FIG. 6 is an enlarged plan view of a portion where a swing pedal 26 is disposed on a mat 66

Explanation of symbols

7 Pivot 26 Swing Pedal 27 SP Pedal 28 Step 37 Support Stay 38 Front / Rear Axis 39 Left / Right Axis 61 Hole 62 Support Member 63 Protrusion 66 Mat 67 Sub Mat Part 68 Main Mat Part

Claims (4)

  A pedal (26, 27) is provided on a support stay (37) supported so as to be rotatable about the front-rear shaft (38), and the pedal (26, 27) can be swung left and right. (26, 27) is supported on the support stay (37) so as to be rotatable about a left-right axis (39), and the pedal (26, 27) is used in the use posture and the left-right axis (39) from the use posture. The posture can be changed to a non-use posture rotated around the front, and the pedals (26, 27) are mounted and supported on the body (7) side in the non-use posture. The support device (62) for restricting the left-right swinging operation is provided.   The pedal (26, 27) is provided with a hole (61), and the support member (62) is provided with a protrusion (63) that fits into the hole (61) in a non-use posture. The pedal device for a work machine according to claim 1.   The pedal device for a working machine according to claim 2, wherein the protrusion (63) is provided so as to protrude upward from the hole (61) when the pedal (26, 27) is not in use. . A mat (66) is laid on the upper surface of the step (28) constituting the floor surface of the airframe (7), and pedals (26, 27) are arranged above the mat (66). 66) is divided into a part (67) in which the pedal (26, 27) is arranged and another main part (68). Machine pedal device.

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