JP2005271850A - Cab and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab, enhancing efficiency in at least one of opening and closing motions for a window body. <P>SOLUTION: A stepping pedal cylinder 41 provided with a stepping pedal 55 contractable by stepping is provided. A push up plate cylinder 42 provided with a push up plate 75 expanded by contraction of the stepping pedal cylinder 41 is provided. When the stepping pedal 55 is stepped to contract it, the push up plate 75 is expanded to push up a lower end of a windshield 22. Thereby, load applied at starting of opening of the windshield 22 is reduced and efficiency in opening the windshield 22 can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cab having a window provided so that an opening of a cab body can be opened and closed, and a work machine including the cab.

  2. Description of the Related Art Conventionally, a cab of a working machine such as a hydraulic excavator includes a frame-shaped cab main body and a front window provided on the cab main body so as to be opened and closed in the vertical direction. The cab body is provided with a guide rail from the front side to the ceiling side, and a guide roller provided on the front window is slidably fitted to the guide rail. Furthermore, the front window is provided with a handle portion that is gripped by an operator.

When the operator opens the front window, the operator grasps the handle and lifts the front window, moves the front window to the ceiling side along the guide rail, and stores the front window in the lower part of the ceiling of the cab ( For example, see Patent Document 1.)
Japanese Patent Laid-Open No. 11-22274 (page 3-5, FIG. 7-8)

  However, in the above-described configuration, the load on the front window is applied to the arm of the operator at the beginning of opening the front window, requiring a large force for the lifting operation, and the workability when opening the front window is not good. Have.

  The present invention has been made in view of these points, and an object of the present invention is to provide a cab that improves the workability of at least one of the opening and closing operations of the window body, and a work machine including the cab.

  According to the first aspect of the present invention, there is provided a frame-shaped cab main body having an opening, a window provided so that the opening of the cab main body can be opened and closed, a fluid pressure pump that can be contracted by stepping, and a fluid pressure pump. A cab having a fluid pressure actuator that is expanded and contracted by a working fluid supplied and discharged from the fluid pressure pump as it expands and contracts and is expanded by contraction of the fluid pressure pump and pushes the window body to assist opening and closing of the window body. Yes, when the fluid pressure pump is stepped on and contracted, the fluid pressure actuator is extended by the contraction of the fluid pressure pump and the window body is pushed, so that the load applied at the beginning of opening or closing of the window body And the workability of at least one of the opening and closing operations of the window body is improved.

  According to a second aspect of the present invention, in the cab according to the first aspect, the fluid pressure pump is provided integrally with the cylinder body, the piston slidably fitted in the cylinder body, and the cylinder body. A rod having a tip projecting from the cylinder and a biasing means provided in the cylinder body and biasing the piston in the extending direction of the rod. By providing the urging means for urging the piston in the extending direction of the rod from which the tip projects, the fluid pressure pump contracted by stepping is automatically returned by the urging means, so that the usability is improved.

  According to a third aspect of the present invention, in the cab according to the first or second aspect, the fluid pressure actuator is pivotally supported to rotate following at least part of the opening / closing operation of the window body, It is provided with a rotation return means that urges the rotation in a direction to return the rotation. The fluid pressure actuator rotates following at least a part of the opening / closing operation of the window body, so that the window body becomes smoother. The operability of at least one of the opening and closing operations of the window body is further improved, and the rotated fluid pressure actuator is automatically returned by the rotation return means, so that the usability is further improved.

  The invention according to claim 4 is the cab according to claim 2 or 3, wherein the cab is connected between the fluid pressure pump and the fluid pressure actuator, and the operation from the fluid pressure actuator to the fluid pressure pump when the fluid pressure actuator contracts. It is equipped with a speed adjustment mechanism that adjusts the return flow rate of oil, and when the fluid pressure actuator contracts, the return flow rate of hydraulic oil from the fluid pressure actuator to the fluid pressure pump is adjusted by the speed adjustment mechanism. The rapid contraction operation of the fluid pressure actuator due to the weight of the window body or the like is prevented, and the workability of at least one of the opening / closing operation of the window body is further improved.

  Invention of Claim 5 is a working machine provided with the machine main body, the cab as described in any one of Claims 1 thru | or 4 provided in the machine main body, and the operation | work apparatus provided in the machine main body so that operation | movement was possible. When the fluid pressure pump of the cab is stepped on and contracted, the fluid pressure actuator is extended by the contraction of the fluid pressure pump and pushes the window body, so that it is added at the beginning of opening or closing the window body The load is reduced, and the workability of at least one of the opening / closing operations of the window body is improved.

  According to the first aspect of the present invention, when the fluid pressure pump is stepped on and contracted, the fluid pressure actuator is extended by the contraction of the fluid pressure pump and pushes the window body. Alternatively, it is possible to reduce the load applied at the beginning of closing and improve the workability of at least one of the opening and closing operations of the window body.

  According to the second aspect of the present invention, the urging means for urging the piston in the extending direction of the rod protruding from the cylinder main body is provided in the cylinder main body of the fluid pressure pump so that it contracts by stepping. Since the fluid pressure pump is automatically returned by the biasing means, the usability can be improved.

  According to the invention of claim 3, the fluid pressure actuator rotates following at least a part of the opening / closing operation of the window body, whereby the window body is pushed more smoothly, and at least any of the opening / closing operation of the window body is performed. The workability can be further improved, and since the rotated fluid pressure actuator is automatically returned by the rotation return means, the usability can be further improved.

  According to the fourth aspect of the present invention, when the fluid pressure actuator contracts, the flow rate of the hydraulic oil from the fluid pressure actuator to the fluid pressure pump is adjusted by the speed adjustment mechanism, so that the fluid due to the weight of the window body or the like A rapid contraction operation of the pressure actuator can be prevented, and the workability of at least one of the opening / closing operation of the window body can be further improved.

  According to the fifth aspect of the present invention, when the fluid pressure pump of the cab is stepped on and contracted, the fluid pressure actuator is extended by the contraction of the fluid pressure pump and pushes the window body, so that the opening of the window body is started. The load applied at the time of closing or at the beginning of closing can be reduced, and the workability of at least one of the opening and closing operations of the window can be improved.

  Hereinafter, the present invention will be described in detail with reference to the embodiment shown in FIGS.

  FIG. 8 shows a hydraulic excavator as a work machine. The hydraulic excavator has a lower traveling body 1 that can travel, and a machine main body 3 that has an upper revolving body 2 that is pivotably provided on the lower traveling body. The upper swing body 2 of the machine body 3 is provided with a work device 4 projecting forward so that the work device 4 can be operated. A cab 6 defining a cab 5 is formed on the upper swing body 2. 4 and a rear portion of the cab 6 of the upper swing body 2 is provided with a housing portion 7 for housing an engine, a hydraulic oil tank, a fuel tank or the like (not shown).

  The working device 4 includes a boom 11 whose base end is pivotally supported by the upper swing body 2 so as to be pivotable in the vertical direction, and a base end pivotally supported by the tip of the boom 11 so as to be pivotable in the front-rear direction. Arm 12 and a bucket 14 pivotally supported via a linkage 13 at the tip of the arm 12. The working device 4 can be operated with respect to the upper swing body 2 by a boom cylinder 15, an arm cylinder 16 and a bucket cylinder 17 as hydraulic actuators for rotating the boom 11, the arm 12 and the bucket 14, respectively. Yes.

  The driver's cab 5 is provided with a driver's seat (not shown) where an operator sits, various operating levers (not shown) operated by the operator, and the like.

  As shown in FIGS. 1 to 3 and 7, the cab 6 includes a cab body 21 as a frame body, a front window 22 as a window body attached to the front side of the cab body 21 so as to be openable and closable, A cab door 24 is provided on the left side of the cab body 21 so that the cab 5 can be opened and closed.

  The cab body 21 is formed in a frame shape so as to surround the cab 5 with, for example, a hard metal steel pipe. The cab body 21 is provided with a pair of guide rails 25 and 25 for guiding the front window 22 from the left and right front pillar portions 21a located on the front side to the ceiling side portion 21b.

  Here, as shown in FIG. 1 and FIG. 2, a curved portion 25 a that is slightly curved forward and downward is continuously formed at the lower ends of the guide rails 25 and 25.

  Further, as shown in FIGS. 1 to 3, a cab floor 26 that serves as a floor surface of the cab 5 is provided at the bottom of the cab body 21. The cab body 21 is mounted on the frame of the upper swing body 2 via a buffer member (not shown). Further, as shown in FIG. 7, a lower glass 27 is provided below the front window 22 of the cab body 21, and a ceiling glass 28 is provided on the ceiling portion of the cab body 21.

  As shown in FIG. 6, the front window 22 is provided in a substantially rectangular frame-shaped window frame body 31, a front window glass 32 fitted to the window frame body 31, and a peripheral portion of the window frame body 31. A sealing member 33 and a handle 34 attached to the window frame 31.

  The window frame body 31 is formed of, for example, a metal member, and the guide rollers 35 protrude from the four corners of the window frame body 31 in the left-right direction that intersects with the opening / closing direction of the front window 22 and rotates. It is pivotally supported. These guide rollers 35 are slidably fitted to the guide rails 25 and 25, respectively, so that the front window 22 can be moved in the vertical direction.

  The front window glass 32 is, for example, a laminated glass having a multiple structure for preventing scattering.

  The seal member 33 seals the window frame body 31 against the cab body 21, and is provided on the entire peripheral edge of the window frame body 31. The seal member 33 is in contact with the upper portion of the lower glass 27 with the front window 22 closed, and is elastically crushed by the weight of the front window 22, thereby sealing the cab 5 in an airtight manner.

  The handle body 34 is gripped when the operator opens and closes the front window 22, and is provided on the lower side of the window frame body 31 and on the rear side of both upper side portions.

  In the present embodiment, the window operation assisting device 23 assists the opening operation of the front window 22, and as shown in FIGS. 1, 2, 3 and 5, the cab floor 26 and the upper swivel are turned on. A foot pedal cylinder 41 (hereinafter referred to as a pedal cylinder 41), which is a hydraulic pump as a fluid pressure pump provided over the frame of the body 2, and a hydraulic actuator as a fluid pressure actuator provided in the lower portion of the front window 22. A push-up plate cylinder 42 (hereinafter referred to as a plate cylinder 42), the pedal cylinder 41 and the plate cylinder 42 are connected to each other, and supply / discharge passages 43, 44 through which hydraulic oil as a working fluid passes, and supply / discharge passage 43 And a speed adjusting mechanism 45 provided in

  The pedal cylinder 41 includes a cylindrical cylinder body 51 embedded in the frame of the upper swing body 2, cylinder caps 52 and 53 fitted to both ends of the cylinder body 51, and the cylinder body 51. A piston 54, a foot pedal 55 as a rod provided integrally with the piston 54, and a spring 56 as an urging means for urging the piston 54 upward.

  The cylinder body 51 is disposed in the vertical direction, and is embedded so that the upper end portion does not protrude from the frame of the upper swing body 2.

  The cylinder cap 52 is provided in a substantially bottomed cylindrical shape, and is liquid-tightly fitted to the lower end opening of the cylinder body 51 via a seal ring 57. A supply / discharge port 58 that communicates with the head chamber H1 in the cylinder body 51 and is connected to the supply / discharge path 43 is provided at the lower portion of the cylinder cap 52. Further, a cylindrical protrusion 59 into which the piston 54 can be fitted protrudes from an upper portion of the cylinder cap 52 inside the cylinder body 51.

  The cylinder cap 53 is provided in a cylindrical shape, and is fitted into the upper end opening of the cylinder body 51 via a seal ring 61 in a liquid-tight manner. In addition, a supply / discharge port 62 that communicates with the rod chamber R1 in the cylinder body 51 and is connected to the supply / discharge path 44 is provided at the front portion of the cylinder cap 53.

  The piston 54 is provided in a substantially cylindrical shape, is fluid-tightly fitted in the cylinder body 51 via a plurality of seal rings 63 attached to the outer peripheral surface, and is slidable in the vertical direction. .

  The foot pedal 55 is provided integrally with the piston 54, and is fluid-tightly inserted into the cylinder cap 53 by a seal ring 64 provided on the inner periphery of the cylinder cap 53, and protrudes upward, which is outside the cylinder body 51. ing. The foot pedal 55 projects from the cab floor 26 to the vicinity of the operator's feet in the cab 5 and can be contracted by stepping.

  The springs 56 are respectively connected to the upper part of the cylinder cap 52 and the lower part of the piston 54, and urge the foot pedal 55 upward through the piston 54.

  On the other hand, the plate cylinder 42 includes a cylindrical plate cylinder body 71 pivotally supported by the front pillar portion 21a of the cab body 21 and plate cylinder caps fitted to both ends of the plate cylinder body 71, respectively. 72, 73, a plate piston 74 disposed in the plate cylinder body 71, and a push-up plate 75 provided integrally with the plate piston 74.

  The plate cylinder body 71 is disposed in the vertical direction along the front pillar portion 21a.

  The plate cylinder cap 72 is provided in a substantially bottomed cylindrical shape, and is fitted into the lower end opening of the plate cylinder main body 71 through a seal ring 81 in a liquid-tight manner. In addition, a plate supply / discharge port 82 that communicates with the head chamber H2 in the plate cylinder main body 71 and is connected to the supply / discharge path 43 is provided at the rear portion of the plate cylinder cap 72.

  Further, a cylindrical plate protruding portion 83 into which the plate piston 74 can be fitted protrudes from an upper portion of the plate cylinder cap 72 inside the cylinder body 51. A shaft support portion 84 is provided at the lower portion of the plate cylinder cap 72 so as to pivotally support the plate cylinder 42 with respect to the cab body 21 so as to be able to rotate in the front-rear direction. A shaft support pin 85 is inserted.

  The plate cylinder cap 73 is provided in a cylindrical shape, and is fitted into the upper end opening of the plate cylinder body 71 through a seal ring 86 in a liquid-tight manner. In addition, a plate supply / discharge port 87 that communicates with the rod chamber R2 in the plate cylinder body 71 and is connected to the supply / discharge passage 44 is provided at the rear portion of the plate cylinder cap 73.

  Further, the plate cylinder cap 73 is provided with a rotation spring 88 as a rotation return means for returning the rotation of the plate cylinder 42 backward to the front, between the front pillar portion 21a. Both ends of the rotating spring 88 are engaged with a main body engaging pin 88a provided on the cab main body 21 and a cap engaging pin 88b provided on the outer side of the plate cylinder cap 73.

  The plate piston 74 is provided in a substantially cylindrical shape, is liquid-tightly fitted in the plate cylinder body 71 via a seal ring (not shown) attached to the outer peripheral surface, and is slidably arranged in the vertical direction. Yes.

  The push-up plate 75 is provided integrally with the plate piston 74, and is provided in a liquid-tight manner with respect to the plate piston 74 via a seal ring 89. Further, the push-up plate 75 is liquid-tightly inserted into the plate cylinder cap 73 by a seal ring 91 provided on the inner periphery of the plate cylinder cap 73 and protrudes upward, which is outside the plate cylinder main body 71.

  Further, as shown in FIGS. 1, 2, and 4, a push-up portion 92 as a substantially prismatic window receiving portion is projected from the upper end portion of the push-up plate 75. The push-up portion 92 is formed with a V-shaped fitting recess 93 cut out in a side view, and the fitting recess 93 has a fitting provided on the rear side of the lower end portion of the window frame 31 of the front window 22. A lower end portion of the front window support plate 94 as a frame body can be fitted. Here, the front window support plate 94 is formed in a substantially L shape bent downward in a side view, and a columnar fitting portion 95 is provided in the left and right direction of the window frame 31 at the lower end portion. The mating portion 95 can be fitted into the fitting recess 93.

  The pedal cylinder 41 is set so that the product of the stroke of the foot pedal 55 and the area of the piston 54 is equal to the product of the desired stroke of the push-up plate 75 of the plate cylinder 42 and the area of the plate piston 74.

  The speed adjustment mechanism 45 adjusts the return flow rate of the hydraulic oil from the head chamber H2 of the plate cylinder 42 to the head chamber H1 of the pedal cylinder 41. As shown in FIG. The throttle valve 96 and the check valve 97 are connected in parallel.

  The throttle valve 96 throttles the return flow of the hydraulic oil from the head chamber H2 of the plate cylinder 42 to the head chamber H1 of the pedal cylinder 41, and the check valve 97 is a plate from the head chamber H1 of the pedal cylinder 41. The hydraulic oil is passed to the head chamber H2 of the cylinder 42 and the return of the hydraulic oil from the head chamber H2 to the head chamber H1 is stopped.

  Next, the operation of the embodiment shown in FIGS. 1 to 8 will be described.

  When the front window 22 is opened, the operator steps on the foot pedal 55 of the pedal cylinder 41 protruding into the cab 5 so that the foot pedal 55 and the piston 54 act against the biasing force of the spring 56. Shrinking into the main body 51, the hydraulic oil in the head chamber H 1 of the pedal cylinder 41 is discharged from the supply / discharge port 58 to the supply / discharge path 43.

  The discharged hydraulic oil passes through the check valve 97 and flows into the head chamber H2 of the plate cylinder 42 from the plate supply / discharge port 82. At the same time, the hydraulic oil in the rod chamber R2 of the plate cylinder 42 is discharged from the plate supply / discharge port 87 to the supply / discharge passage 44 and flows from the supply / discharge port 62 into the rod chamber R1 of the pedal cylinder 41.

  As a result, as shown by an imaginary line in FIG. 2, the push-up plate 75 is extended, the push-up portion 92 pushes up the front window 22 together with the front window support plate 94, and the guide roller 35 of the front window 22 is curved in the guide rail 25. It slides rearward and upward along the part 25a.

  At this time, the plate cylinder 42 rotates rearward about the pivot pin 85 and tilts following the opening operation of the front window 22.

  Further, when the push-up plate 75 is pushed downward by its own weight of the front window 22, the return flow rate of the hydraulic oil from the head chamber H2 of the plate cylinder 42 to the head chamber H1 of the pedal cylinder 41 is adjusted by the throttle valve 96. The fall speed due to the dead weight of the front window 22 is reduced.

  Then, the operator grasps the handle 34 and lifts the front window 22 to the ceiling side part 21b, slides the guide roller 35 of the front window 22 along the guide rail 25, and moves it to the lower part of the ceiling of the cab body 21. And the front window 22 is stored.

  When the operator removes his or her foot from the foot pedal 55, the push-up plate 75 contracts due to its own weight and returns to the lowest position, and the plate cylinder 42 rotates forward by the rotating spring 88 and returns to the original position. At the same time, the foot pedal 55 is extended by the spring 56, and the pedal cylinder 41 returns to the initial opening / closing state of the front window 22.

  Next, effects of the embodiment shown in FIGS. 1 to 8 will be listed.

  When the foot pedal 55 of the pedal cylinder 41 is stepped on and contracted, the push-up plate 75 of the plate cylinder 42 is expanded by the contraction of the pedal cylinder 41 and the lower end of the front window 22 is pushed up, so that the opening of the front window 22 begins. It is possible to reduce the load applied during the operation and improve the workability when opening the front window 22.

  Moreover, since the pedal cylinder 41 and the plate cylinder 42 can be operated by stepping, the operator can use both hands to support the front window 22 when opening the front window 22. The sex can be further improved.

  In the cylinder body 51 of the pedal cylinder 41, a spring 56 that urges the piston 54 in the extending direction of the foot pedal 55 protruding from the cylinder body 51 is provided, so that the foot pedal of the pedal cylinder 41 contracted by stepping Since 55 automatically returns from the spring 56, usability can be improved.

  During the opening operation of the front window 22, when the front window 22 moves rearward along the curved portion 25a of the guide rail 25, the plate cylinder 42 follows the front window 22 and rotates rearward. The window 22 can be pushed up more smoothly, the workability when opening the front window 22 can be further improved, and the rotated plate cylinder 42 is automatically returned to the front by the rotating spring 88. It is possible to prevent the plate cylinder 42 from rotating backward when the valve is closed, and the usability can be further improved.

  When the push-up plate 75 of the plate cylinder 42 is contracted, the return flow rate of the hydraulic oil from the head chamber H2 of the plate cylinder 42 to the head chamber H1 of the pedal cylinder 41 is adjusted by the speed adjustment mechanism 45, so that the front window 22 Abrupt contraction of the push-up plate 75 of the plate cylinder 42 due to weight or the like can be prevented, and workability when opening the front window 22 can be further improved.

  A fitting concave portion 93 having a V-shape when viewed from the side is cut out in the pushing-up portion 92 of the push-up plate 75, and the fitting portion 95 of the front window support plate 94 is fitted into the fitting concave portion 93, so that the front window 22 can be securely supported from below by the push-up plate 75, and the workability when opening the front window 22 can be further improved.

  In the above-described embodiment, the window body is not limited to the one that opens and closes in the vertical direction. For example, the window body can be opened and closed in the left-right direction or can be opened and closed by rotation. Also in this case, by applying the window operation assisting device 23, it becomes possible to assist the opening operation or closing operation of the window body, and workability when opening the window body or closing the window body is improved. It can be improved.

  For example, in the case of a window body that opens downward and closes upward, the window operation assisting device 23 can be applied to the window closing operation to improve workability when closing the window body.

  In the case of a window body that can be opened and closed in the left-right direction, the window operation assisting device 23 is applied in a direction that makes it difficult to open or close the window body, thereby assisting in opening or closing the window body. It becomes possible to do.

  Furthermore, the speed adjustment mechanism 45 is not limited to the above configuration.

  The cab 6 can be mounted not only on a hydraulic excavator but also on various other work machines.

It is a side view which expands and shows a part of one embodiment of the cab concerning the present invention. It is a side view which expands and shows operation | movement of a cab same as the above. It is a front view which shows a part of cab same as the above. It is a perspective view which expands and shows a part of rod of a cab same as the above. It is a hydraulic circuit diagram which shows a cab same as the above. It is a front view which shows the window body of a cab same as the above. It is a perspective view which shows a cab same as the above. It is a side view which shows the working machine provided with the cab same as the above.

Explanation of symbols

3 Machine body 4 Working device 6 Cab
21 Cab body
22 Front window as window
41 Foot pedal cylinder as a fluid pressure pump
42 Push-up plate cylinder as a fluid pressure actuator
45 Speed adjustment mechanism
51 Cylinder body
54 Piston
55 Foot pedal as a rod
56 Spring as a biasing means
88 Rotating spring as rotating return means

Claims (5)

A frame-shaped cab body with an opening,
A window provided so that the opening of the cab body can be opened and closed;
A fluid pressure pump that can be retracted by stepping,
A fluid pressure actuator that is expanded and contracted by the working fluid supplied and discharged from the fluid pressure pump as the fluid pressure pump expands and contracts, is extended by contraction of the fluid pressure pump and pushes the window body to assist at least one of opening and closing of the window body A cab characterized by comprising. Fluid pressure pump
A cylinder body,
A piston slidably fitted in the cylinder body;
A rod provided integrally with the piston and having a tip protruding from the cylinder body;
The cab according to claim 1, further comprising: an urging unit that is provided in the cylinder main body and urges the piston in an extending direction of the rod. The fluid pressure actuator is pivotally supported to rotate following at least a part of the opening / closing operation of the window body,
The cab according to claim 1 or 2, further comprising a rotation return means for urging the fluid pressure actuator in a direction for returning the rotation. A speed adjustment mechanism is provided between the fluid pressure pump and the fluid pressure actuator, and adjusts the return flow rate of hydraulic oil from the fluid pressure actuator to the fluid pressure pump when the fluid pressure actuator contracts. The cab according to claim 2 or 3. The machine body,
A cab according to any one of claims 1 to 4 provided in the machine body;
A work machine comprising: a work device operably provided on the machine body.

Images