JP4806759B2 - Swivel work vehicle - Google Patents

Description

  The present invention relates to a turning work vehicle equipped with a work machine such as a backhoe, and more particularly to a configuration of an engine support portion in the turning work vehicle.

2. Description of the Related Art Conventionally, a turning work vehicle is known in which a turning body is supported so as to be turnable above a traveling device, and a work machine such as a backhoe is mounted on a front end portion of the turning body. At the rear of the revolving structure, an engine is installed on the revolving structure via a vibration isolating member, and the vibration isolating member relieves vibration during start-up and operation. Furthermore, a stopper that restricts the vertical movement of the engine is provided on the support portion of the engine. The radiator fan attached to the engine is mounted on a radiator shroud fixed to the bottom plate of the revolving structure. The radiator fan, the radiator and the shroud are configured to be relatively movable, and the engine When moving up and down with respect to the floor plate of the revolving structure due to vibration or the like, no stress is applied between the engine and the radiator.
JP-A-11-93210

  However, in the turning work vehicle configured as described above, since the stopper is disposed at a position away from the radiator to restrict the vertical movement of the engine, the effect of restricting the vertical movement of the engine is small, and the engine vibrates. When moving up and down due to the above, there is a possibility that the engine-side radiator fan configured to be movable with respect to the radiator and the shroud interferes with the shroud and the engine stops.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
A swiveling body (2) is pivotally supported above the crawler type traveling device (1), and a boom (6) is pivotally supported on the front end of the swiveling body (2), and the boom (6). In a turning work vehicle having a working machine having an arm (5) rotatably supported and a working attachment such as a bucket (4) rotatably supported by the arm (5), an engine ( 21) is supported on the floor plate (50) of the revolving structure (2), and the support portion (B / C) on the radiator (35) side of the engine (21) is a support frame fixed to the engine (21). (45) is supported on the floor plate (50) through the vibration isolating member (46), and the radiator (35) of the engine (21) is fixed to the floor plate (50) on the revolving body (2) side. The shroud (60) is fixed to the engine (21) side of the radiator (35). Vertically, the radiator fan (34) of the engine (21), and covered state to said shroud (60), the radiator fan (34), the vibration of the engine (21) on said vibration isolating member (46) The shroud (60) is configured to be movable relative to the shroud (60), and a stopper is provided on the floor plate (50) below the support frame (45) located at the radiator (35) side end of the engine (21). When the engine (21) is moved downward with respect to the floor plate (50), the stopper (49) comes into contact with the lower surface of the support frame (45) to cause the engine (21). The amount of downward movement is regulated.

Since the present invention is configured as described above, the following effects can be obtained.
A swiveling body (2) is pivotally supported above the crawler type traveling device (1), and a boom (6) is pivotally supported on the front end of the swiveling body (2), and the boom (6). In a turning work vehicle having a working machine having an arm (5) rotatably supported and a working attachment such as a bucket (4) rotatably supported by the arm (5), an engine ( 21) is supported on the floor plate (50) of the revolving structure (2), and the support portion (B / C) on the radiator (35) side of the engine (21) is a support frame fixed to the engine (21). (45) is supported on the floor plate (50) through the vibration isolating member (46), and the radiator (35) of the engine (21) is fixed to the floor plate (50) on the revolving body (2) side. The shroud (60) is fixed to the engine (21) side of the radiator (35). Vertically, the radiator fan (34) of the engine (21), and covered state to said shroud (60), the radiator fan (34), the vibration of the engine (21) on said vibration isolating member (46) The shroud (60) is configured to be movable relative to the shroud (60), and a stopper is provided on the floor plate (50) below the support frame (45) located at the radiator (35) side end of the engine (21). When the engine (21) is moved downward with respect to the floor plate (50), the stopper (49) comes into contact with the lower surface of the support frame (45) to cause the engine (21). Therefore, the radiator fan mounted on the radiator shroud interferes with the shroud 60 to stop the engine or at the radiator side end of the engine. Possible to prevent the muffler is set to or burnt to interfere with the frame of the swing body.
In particular, since the stopper is disposed in the proximity of the radiator fan and the shroud, which are interference parts, the effect of restricting the movement of the engine is high, and the interference between the radiator fan and the shroud, the muffler and the frame of the revolving structure Interference can be reliably prevented.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 is an overall side view showing a turning work vehicle of the present invention, FIG. 2 is a plan view showing the inside of a bonnet, FIG. 3 is a rear view, FIG. 4 is a perspective view showing a frame of a turning body, and FIG. It is a top view which shows the flame | frame of the turning body of the state which attached the counterweight.

  6 is a side view showing the frame of the swivel body, FIG. 7 is a side cross-sectional view showing the counterweight attached to the rear weight, and FIG. 8 is fixed to the engaging pin fixed to the shaft of the swivel joint and the floor plate of the swivel body. FIG. 9 is a perspective view, and FIG. 10 is a plan view showing the mounting position of the multi-valve.

  11 is a perspective view showing a multi-valve mounting state, FIG. 12 is a plan view showing a frame of a conventional swivel body, and FIG. 13 is a perspective view showing an engagement state between a shaft of a conventional swivel joint and a floor plate of the swivel body. FIG. 14 is a perspective view showing an installed state of a conventional multi-valve.

  In the prior art, as shown in FIG. 12, the swinging body 102 has a pair of left and right members 111 and 112 erected on the bottom plate 110 from the boom support portion 102a at the front end to the rear of the swinging body 102. Constructed a frame. A communication hole 110a is opened in a portion of the floor plate 110 corresponding to the turning center of the revolving structure 102. As shown in FIG. 13, the communication hole 110a is fixed to the traveling device side below the revolving structure 102. The upper end portion of the swivel joint 121 protrudes upward.

  The swivel joint 121 includes a main body 121a fixed to the traveling device side, and a shaft 121b that is rotatably fitted to the main body 121a. An engagement plate 122 is fixed to the shaft 121a. ing. A part of the peripheral edge portion of the communication hole 110a is cut away to form a rotation guide 110b, and the tip end portion 122a of the engagement plate 122 is engaged with the rotation guide 110b so that the shaft of the swivel joint 121 is engaged. 121b and the revolving structure 102 are configured to rotate integrally. In the prior art, as shown in FIG. 14, the multi-valve 113 disposed in the revolving structure 102 has a switching operation lever 133 a at the upper end and is erected on the floor plate 110 via the bracket 110. It had been.

  Next, the configuration of the turning work vehicle of the present invention will be described. In FIG. 1, a turning work vehicle supports a turning body 2 at the upper center of a crawler type traveling device 1 so as to be able to turn left and right. Arranged freely. A bonnet 14 that covers the engine 21 and the like installed on the revolving structure 2 is disposed above the revolving structure 2, and a seat 16 is attached above the bonnet 14. In front of the seat 16, a driving operation unit 15 configured by arranging levers for operating the lever guide 19 and the like is provided. A step 20 is disposed between the lever guide 19 and the bonnet 14 of the driving operation unit 15.

  A counterweight 17 is attached to the rear end portion of the revolving structure 2, and a canopy support member 18 is erected on the counterweight 17. And the canopy 8 which covers the upper part of the driving | operation operation part 15 and the sheet | seat 16 is attached to this canopy support member 18 so that attachment or detachment is possible. The bonnet 14 is configured such that a rear end portion thereof is vertically rotatable around a rotation center 14a at the front portion, and the inside of the bonnet 14 is opened by rotating the rear end portion of the bonnet 14 upward. Like to do.

  In addition, a boom bracket 12 is attached to the boom support portion 2a at the front end portion of the revolving structure 2 so as to be turnable in the left-right direction, and the lower end portion of the boom 6 is supported on the boom bracket 12 so as to be rotatable up and down. The boom 6 is bent forward in the middle and is formed in a substantially “<” shape having a bent portion 6 d in a side view, and an arm 5 is rotatably supported on the upper end of the boom 6. A bucket 4 as a work attachment is rotatably supported at the tip of the arm 5. The boom 7, the arm 5, the bucket 4, and the like constitute a work machine 7.

  The boom 6 is rotated by a boom cylinder 11, the arm 5 is rotated by an arm cylinder 10, and the bucket 4 is rotated by a bucket cylinder 9. The boom cylinder 11, arm cylinder 10, and bucket cylinder 9 are configured as hydraulic cylinders, and each cylinder 9, 10, 11 supplies pressure oil from a hydraulic pump disposed in the bonnet 4 of the swivel base 2 through a hydraulic hose. By doing so, it is driven to extend and contract. Further, the boom cylinder 11 is interposed between the cylinder support portion 12b of the boom bracket 12 and the boom cylinder bracket 36 provided on the middle front surface of the boom 6, and the arm cylinder 10 is provided on the middle rear surface of the boom 6. An arm cylinder bottom bracket 31 is interposed between the bucket cylinder bracket 30 provided at the base end portion of the arm 5, and the bucket cylinder 9 is interposed between the bucket cylinder bracket 30 and the bucket bracket 29 connected to the bucket 4. Has been.

  Next, the structure inside the revolving structure 2 will be described. As shown in FIGS. 2 to 4, in the swing body 2, a pair of left and right left members 51 and a right member 52 are erected from the front end portion to the rear end portion of the floor plate 50, and the boom at the front end portion of the swing body 2 is provided. A reinforcing plate 55 is fixed to the upper end of the support portion 2a and the left and right members 51 and 52, and the floor plate 50, left and right members 51 and 52, the reinforcing plate 55, and the like constitute a frame. The right member 52 is fixedly provided with a multi-valve 61 that can change the operation pattern of turning, boom, bucket, and the like. The multi-valve 61 is disposed below the step 20. In addition, an engine 21 is installed at the rear part of the revolving structure 2, and a flywheel attached to the engine 21 is horizontally installed so as to be arranged on the left and right sides. A hydraulic pump 22 is attached to the end of the flywheel case 21 a that houses the flywheel of the engine 21, and the hydraulic pump 22 is driven by the crankshaft (output shaft) of the engine 21. On the other left and right sides of the engine 21, a radiator fan 34 that is driven to rotate by a crankshaft (output shaft) of the engine 21 via a belt is provided, and a radiator 35 is disposed in the vicinity of the radiator fan 34. Yes.

  The engine 21 is supported and fixed to the floor plate 50 of the revolving structure 2 at three points of the support portions A, B, and C. The support portion A is disposed below the hydraulic pump 22 on the left and right sides of the engine 21, and the support portions B and C is disposed at the front and rear portions on the left and right other sides of the engine 21. In the support portion A, the engine 21 is supported by a support member 44 composed of a vibration isolation member or the like, and in the support portions B and C, the engine 21 is fixed to the engine 21 by a support member 46 also composed of a vibration isolation member or the like. The engine 21 is supported through a support frame 45 provided, and the support frame 45 is configured in a plan view.

  The radiator 35 is fixed to the floor plate 50 of the revolving structure 2, a shroud 60 is fixed to the radiator 35 on the engine 21 side, and the radiator fan 34 of the engine 21 is mounted on the shroud 60. The radiator fan 34 and the engine 21 and the shroud 60 are configured to be relatively movable, and the engine 21 supported by the support members 44 and 46 formed of a vibration isolating member or the like causes the floor plate of the swing body 2 by vibration or the like. When moving up and down with respect to 50, no stress is applied between the engine 21 and the radiator fan 34 and the shroud 60. A muffler 37 fixed to the rear end portion of the support frame 45 is disposed below the radiator 35.

  Upper stoppers 48 and 48 are disposed above the support frame 45 in the support portions B and C. When the engine 21 moves upward with respect to the floor plate 50, the upper stoppers 48 and 48 are placed on the upper surface of the support frame 45. The amount of upward movement of the engine 21 is restricted. Further, a lower stopper 49 erected on the floor plate 50 is arranged below the front and rear central portions of the end portion of the support frame 45 located on the radiator 35 side of the engine 21, so that the engine 21 is connected to the floor plate 50. The lower stopper 49 abuts against the lower surface of the support frame 45 when moving downward, thereby restricting the downward movement amount of the engine 21.

  The upper stopper 48 and the lower stopper 49 regulate the amount of vertical movement of the radiator fan 34 due to vibrations of the engine 21 and the like so that the radiator fan 34 does not interfere with the upper and lower surfaces of the shroud 60. In this way, by restricting the vertical movement amount of the engine 21 by the upper stopper 48 and the lower stopper 49, the radiator fan 34 and the shroud 60 interfere with each other, the engine 21 stops or the radiator side end portion of the engine 21. It is possible to prevent the muffler 37 fixed to the frame from interfering with the frame of the revolving unit 2 and burning out. In particular, the lower stopper 49 disposed in the proximity of the radiator fan 34 and the shroud 60, which are interference portions, has a high effect of restricting the amount of movement of the engine 21, and the interference between the radiator fan 34 and the shroud 60, and the muffler 37 and swivel. Interference with the frame of the body 2 can be reliably prevented.

  As shown in FIGS. 4 to 6, a rear weight 53 is disposed at the rear end portion of the floor plate 50 of the revolving structure 2, and the counterweight 17 can be attached to the rear weight 53. Further, a communication hole 50a is opened at a substantially central portion of the floor plate 50, and an upper end portion of a swivel joint 62 fixed to the traveling device 1 side below the revolving structure 2 is connected to the floor plate 50 from the communication hole 2a. It protrudes upward. The rear weight 53 and the boom support portion 2a at the front end of the floor board 50 are connected by the left and right members 51 and 52, and the rear weight 53, the boom support portion 2a, and the left and right members 51 and 52 constitute a box-type structure. Thus, the frame strength of the revolving structure 2 is increased. In addition, a reinforcing plate 55 is fixed to the upper surfaces of the front portions of the left and right members 51 and 52 and the boom support portion 2a, and the reinforcing plate 55 also increases the strength.

  The left member 51 has a two-layer structure in which a reinforcing member 51b, which is also a plate member, is attached to the left main member 51a, which is a plate member, and the right member 52 is connected to the right main member 52a, which is a plate member. Similarly, a reinforcing member 52b, which is a plate-like member, is attached to form a two-layer structure. The left and right members 51 and 52 are perpendicular to the floor plate 50 and have respective rear portions bent outwardly so as to have a substantially “C” shape in plan view. 52b is further bent outward with respect to the right main member 52a. As described above, the left and right members 51 and 52 have a two-layer structure, and the rear portions of the left and right members 51 and 52 are bent outward to form a substantially “C” shape, thereby further forming the frame of the revolving body 2. Strength can be increased. Further, the strength from the front end portion to the rear end portion of the frame can be increased as a whole, and the strength balance can be improved. In addition, by combining with the above-described box-type structure, the strength of the turning body 2 as an important base material of the turning work vehicle can be sufficiently secured, and the reliability of the turning work vehicle can be improved. It is possible to meet the demands for the strength and reliability of cars.

  Further, guide pins 53a are erected at the substantially right and left central portions of the rear weight 53, and weight fixing holes 53b, 53b... Yes. As shown in FIGS. 5 and 7, when the counterweight 17 is attached to the rear weight 53, the guide pin 53 a of the rear weight 53 is inserted into the counterweight 17 to fix the attachment position of the counterweight 17. Then, bolts are fastened to the weight fixing holes 53b, 53b... Of the rear weight 53, and the counterweight 17 is fixedly mounted.

  Further, a hydraulic device such as a traveling motor disposed on the traveling device 1 side and a hydraulic cylinder for rotating the blade 3 up and down is provided from a hydraulic pump 22 on the revolving body 2 side configured to be able to swivel with respect to the traveling device 1. The hydraulic oil is supplied through the swivel joint 62. The swivel joint 62 includes a main body portion 62a fixed to the traveling device 1 side, and a shaft 62b that is rotatably fitted to the main body portion 62a. It consists of As shown in FIGS. 8 and 9, an engagement pin 63 protruding outward in the radial direction is fixed to the upper end portion of the shaft 62b, and an engagement stay is provided in the vicinity of the peripheral edge portion of the communication hole 50a in the floor board 50. 64 is fixed. The engagement stay 64 includes an attachment portion 64a that is attached and fixed to the floor plate 50 by bolts 65, welding, and the like, and an engagement portion 64b that protrudes obliquely upward in the center direction of the communication hole 50a from the peripheral portion of the communication hole 50a. It is configured. A long hole 64c is formed in the engagement portion 64b in the vertical direction. The long hole 64c is engaged with the engagement pin 63 at the upper end of the shaft 62b to engage with the shaft 62b of the swivel joint 62. The revolving unit 2 to which the stay 64 is attached is configured to rotate integrally.

  Thus, a mechanism for integrally rotating the shaft 62b of the swivel joint 62 and the swivel body 2 includes an engagement pin 63 fixed on the shaft 62b side, and an engagement stay 64 attached on the swivel body 2 side. And the mechanism can be configured in a space-saving and compact manner, and the shaft 62b and the swing body 2 can be reliably rotated integrally. Further, by configuring the mechanism in a space-saving and compact manner, a wide opening space between the peripheral portion of the communication hole 50a of the floor board 50 and the swivel joint 62 can be secured. Accordingly, when an abnormality such as oil leakage occurs in the main body portion 62a of the swivel joint 62 positioned below the bottom plate 50, the maintainability of the joint portion and the like in the main body portion 62a from above the bottom plate 50 is improved. It becomes possible. Further, since the notch for engagement can be eliminated, the strength can be prevented from being lowered, and alignment during assembly can be facilitated.

  Further, as shown in FIGS. 10 and 11, the multi-valve 61 is attached to the right member 52 via a bracket 66. The multi-valve 61 is installed so as to be substantially parallel to the floor plate 50, and is attached with the operation lever 61a facing outward in a so-called sideways state. The multi-valve 61 is disposed below the right end portion of the step 20, and the step 20 is configured to be openable and closable. Of course, the multi-valve 61 can be attached to the left member 51 and disposed below the left end of the step 20.

  As described above, when the multi-valve 61 is placed horizontally and below the left and right ends of the step 20, when operating the operation lever 61a of the multi-valve 61, the step 20 can be opened only from the outside. It can be easily operated. In addition, the turning body 2 can be made thin, the center of gravity of the turning work vehicle can be lowered, and the stability can be improved. Furthermore, all the hydraulic piping from the multi-valve 61 can be laid out collectively, for example, downward, so that the piping layout can be made compact. Then, by making the pipe compact as described above, it is possible to prevent the hydraulic pipe from being bent suddenly and to shorten the pipe length to the control valve and the pilot valve. Thereby, the pressure loss of piping etc. are reduced, the responsiveness with respect to a pilot signal improves, and the operativity can be aimed at.

  That is, a pair of left and right members constituting the frame is arranged on the revolving structure, and the boom support portion at the front end of the revolving structure and the weight member at the rear end of the revolving structure are connected by the pair of left and right members. The frame strength can be increased in a balanced manner from the front end portion to the rear end portion of the frame. In addition, the strength of the turning work vehicle as an important base material for the turning work vehicle can be secured, and the reliability of the turning work vehicle can be improved, and the recent demand for strength and reliability of the turning work vehicle can be met. It becomes possible.

  Further, each of the left and right members is constituted by a plurality of plate-like members so as to be multilayered, and the rear portions of the left and right members are bent outwardly to form a substantially “C” shape in plan view. Therefore, the frame strength of the revolving structure can be further increased, and the strength balance from the front end portion to the rear end portion of the frame can be further improved. And by combining with the above-mentioned box structure, the strength of the turning body as an important base material of the turning work vehicle can be sufficiently secured, and the reliability of the turning work vehicle can be further improved. It is possible to meet the demands for the strength and reliability of the car.

  In addition, a multi-valve configured to change the operation pattern of the hydraulic device is horizontally provided on a member of a frame disposed from the front end portion to the rear end portion of the revolving structure, and the multi-valve is disposed on one side of the step. Since the multi-valve is switched below, it can be easily operated from the outside simply by opening a step. In addition, the thickness of the turning body can be reduced, the center of gravity of the turning work vehicle can be lowered, and the stability can be improved. Further, all the hydraulic piping from the multi-valve can be laid out collectively in one place such as the lower side, and the piping layout can be made compact. Then, by making the pipe compact as described above, it is possible to prevent the hydraulic pipe from being bent suddenly and to shorten the pipe length to the control valve and the pilot valve. Thereby, the pressure loss of piping etc. are reduced, the responsiveness with respect to a pilot signal improves, and the operativity can be aimed at.

  Further, an engagement pin that protrudes radially outward is provided at the upper end of the shaft of the swivel joint, and an engagement member that can be engaged with the engagement pin is fixed on the revolving structure side, and the engagement pin and the engagement member are engaged. Since the swivel body and the swivel joint shaft can be rotated together by combining the swivel joint shaft and swivel body, the mechanism for rotating the swivel joint shaft and the swivel body can be configured compactly in a space-saving manner. In addition, the shaft and the revolving body can be reliably rotated integrally. Further, by configuring the mechanism in a space-saving and compact manner, it is possible to secure a wide opening space between the communication hole peripheral portion formed on the floor plate of the swivel body and the swivel joint. Thereby, when an abnormality such as oil leakage occurs in the main body portion of the swivel joint located below the bottom plate of the swivel body, the maintainability of the joint portion and the like in the main body portion from above the bottom plate can be improved. It becomes possible.

1 is an overall side view showing a turning work vehicle of the present invention. It is a top view which shows the inside of a bonnet. Similarly it is a rear view. It is a perspective view which shows the flame | frame of a turning body. It is a top view which shows the flame | frame of the turning body of the state which attached the counterweight to the rear weight. It is a side view which shows the flame | frame of a turning body. It is side surface sectional drawing which shows the counterweight attached to the rear weight. It is a top view which shows the engagement state of the engagement pin fixed to the shaft of the swivel joint, and the engagement stay fixed to the floor board of the revolving structure. It is a perspective view similarly. It is a top view which shows the attachment position of a multivalve. It is a perspective view which shows the attachment state of a multivalve. It is a top view which shows the flame | frame of the conventional turning body. It is a perspective view which shows the engagement state of the shaft of the conventional swivel joint, and the floor board of a turning body. It is a perspective view which shows the installation state of the conventional multi valve | bulb.

2 Revolving body 2a Boom support portion 20 Step 21 Engine 45 Support frame 49 Lower stopper 50 Floor plate 50a Communication hole 51 Left member 51a Left main member 51b Auxiliary member 52a Right main member 52b Auxiliary member 53 Rear weight 61 Multi valve 62 Swivel joint 62b Shaft 63 engaging pin 64 engaging stay A / B / C support

Claims (1)

A swiveling body (2) is pivotally supported above the crawler type traveling device (1), and a boom (6) is pivotally supported on the front end of the swiveling body (2), and the boom (6). In a turning work vehicle having a working machine having an arm (5) rotatably supported and a working attachment such as a bucket (4) rotatably supported by the arm (5), an engine ( 21) is supported on the floor plate (50) of the revolving structure (2), and the support portion (B / C) on the radiator (35) side of the engine (21) is a support frame fixed to the engine (21). (45) is supported on the floor plate (50) through the vibration isolating member (46), and the radiator (35) of the engine (21) is fixed to the floor plate (50) on the revolving body (2) side. The shroud (60) is fixed to the engine (21) side of the radiator (35). Vertically, the radiator fan (34) of the engine (21), and covered state to said shroud (60), the radiator fan (34), the vibration of the engine (21) on said vibration isolating member (46) The shroud (60) is configured to be movable relative to the shroud (60), and a stopper is provided on the floor plate (50) below the support frame (45) located at the radiator (35) side end of the engine (21). When the engine (21) is moved downward with respect to the floor plate (50), the stopper (49) comes into contact with the lower surface of the support frame (45) to cause the engine (21). A turning work vehicle characterized by restricting a downward movement amount of the vehicle.

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