JP7094848B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle comprising an operator cabin forming an operation chamber.

Examples of such work vehicles include hydraulic excavators (excavators) and skid steer loaders. These working vehicles include an engine, a hydraulic pump driven by the engine, and a plurality of hydraulic actuators (hydraulic motors and hydraulic cylinders) that operate by receiving hydraulic oil discharged from the hydraulic pumps. It is configured to operate a crawler mechanism (traveling device), an excavator device, etc. by an actuator to perform traveling, excavation work, and the like. These running operations and excavation operations are performed in the operator cabin provided on the vehicle body frame. In such a work vehicle, the operator cabin is provided so that it can be tilted up and down (tilt up) with respect to the vehicle body frame in order to perform maintenance work on equipment such as hydraulic control valves arranged below the operator cabin. The vehicle is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2017-25668

In a conventional work vehicle, in a support portion that tiltably supports the operator cabin with respect to the vehicle body frame, a plate-shaped rubber is provided between the vehicle body side support portion and the cabin side support portion. The rubber was designed to prevent the vibration of the vehicle body frame from being transmitted to the operator cabin. However, in such a plate-shaped rubber, since the rubber is small or hard, it is not possible to sufficiently block the vibration from the vehicle body frame, and there is a problem that the vibration isolating effect is small.

The present invention has been made in view of such problems, and an object of the present invention is to provide a work vehicle capable of reducing vibration transmitted from a vehicle body frame to an operator cabin.

In order to achieve the above object, the present invention is a work vehicle provided on a vehicle body frame and provided with an operator cabin forming an operation chamber, wherein the operator cabin is pivotally connected to one end side with respect to the vehicle body frame, and the like. It is possible to swing around the pivot portion on one end side so that the end side moves up and down, and on the other end side of the operator cabin, an auxiliary for tilting up the operator cabin around the pivot connection portion is provided. A gas spring unit for applying a force is arranged between the vehicle body frame and the first and second gas springs, and the first and second gas spring units are arranged in parallel. It has a third gas spring connected in series with the gas spring. Further, a pivotal structure in which one end side is pivotally connected to the vehicle body frame is inserted into the cylindrical vibration-proof rubber provided on the support portion on one side of the vehicle body frame and the operator cabin, and the vibration-proof rubber. A cylindrical bearing member provided in a state and a pivot shaft provided on a support portion on the other side of the vehicle body frame and the operator cabin, inserted through the bearing member, and rotatable relative to the bearing member. Be prepared to be configured.

In the work vehicle having the above configuration, the work vehicle has a hole portion larger than the diameter of the pivotal shaft and smaller than the outer diameter of the anti-vibration rubber, and the end portion of the pivotal shaft is inserted into the hole portion. It is preferable to provide a stopper member disposed on the support portion on one side in the state.

According to the work vehicle according to the present invention, the pivot structure for pivoting the operator cabin to the vehicle body frame is a cylindrical anti-vibration rubber provided on one support portion of the vehicle body frame and the operator cabin, and an anti-vibration rubber. A cylindrical bearing member provided in the state of being inserted into the body frame, and a pivot shaft provided on the support portion on the other side of the vehicle body frame and the operator cabin, which is inserted through the bearing member and is rotatable relative to the bearing member. Be prepared for it. Since the cylindrical anti-vibration rubber is arranged around the pivot shaft and the bearing member in this way, the vibration transmitted from the vehicle body frame to the operator cabin can be reliably blocked by the anti-vibration rubber. In addition, since the pivot shaft, bearing member, and anti-vibration rubber can be handled as an integral part, the number of parts can be reduced and the efficiency of assembly work can be improved.
Further, a gas spring unit that provides an auxiliary force for tilting up the operator cabin is connected in series to the first and second gas springs arranged in parallel with the first and second gas springs. It is configured to have a third gas spring. Here, the largest force is required when starting to tilt up the operator cabin, and the force is assisted by two first and second gas springs arranged in parallel to smoothly tilt up the operator cabin. Can be made to. When the first and second gas springs are extended to the maximum, the third gas spring 430 can be configured to be extended.

The working vehicle according to the present invention preferably has a hole larger than the diameter of the pivot shaft and smaller than the outer diameter of the anti-vibration rubber, and the end portion of the pivot shaft is inserted into the hole. It is configured to include a stopper member disposed on a support portion on one side of the vehicle body frame and the operator cabin in the state of being in the state. With such a configuration, when the operator cabin swings and the anti-vibration rubber is deformed, the pivot shaft comes into contact with the inner surface of the hole of the stopper member, so that the anti-vibration rubber is deformed by a predetermined amount or more. You can prevent that.

It is a perspective view seen from the left side of the hydraulic excavator which is an example of the work vehicle which concerns on this invention. It is a left side view of the said hydraulic excavator. It is a perspective view seen from the right side of the said hydraulic excavator. It is a right side view of the said hydraulic excavator. It is a rear view of the said hydraulic excavator. It is a block diagram which shows the structure of the hydraulic drive device of the said hydraulic excavator. It is a left side view of the operator cabin provided in the said hydraulic excavator. It is a perspective view seen from the right side of the said operator cabin. It is an enlarged view of the main part in FIG. It is sectional drawing of the part shown by the arrow AA in FIG. 7. It is an enlarged view of the main part in FIG. It is sectional drawing of the part shown by the arrow BB in FIG. 7. It is a perspective view which showed the gas spring unit provided in the said operator cabin, and was seen from the left rear of the operator cabin and a swing body frame. It is a perspective view seen from the front of the said gas spring unit. It is a perspective view seen from the rear of the said gas spring unit. It is a perspective view seen from substantially right behind the operator cabin and the swing body frame which shows the said gas spring unit. It is a perspective view from the left rear side of the operator cabin and the swivel body frame which shows the state which the said operator cabin is tilted up substantially to the maximum. It is a perspective view which showed the state which the said operator cabin was tilted up substantially to the maximum, and was seen from substantially right behind the operator cabin and the swing body frame. It is a perspective view from the rear lower side of the operator cabin and the swivel body frame which shows the state which the said operator cabin is tilted down. It is a perspective view which showed the lock mechanism provided in the said operator cabin, and was seen from the left rear of the operator cabin and a swing body frame. It is a perspective view of the said lock mechanism. It is a perspective view from the left rear of the operator cabin and the swivel body frame which shows the state of releasing the lock by the lock mechanism. It is a perspective view from the left rear side of the operator cabin and the swing body frame which shows the state which the lock by the lock mechanism was released and the operator cabin started to tilt up. It is a perspective view from the left rear of the operator cabin and the swing body frame which shows the state which the lock by the lock mechanism is released and the operator cabin is tilted up.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a crawler type hydraulic excavator (excavator) will be described as an example of the work vehicle according to the present invention. First, the overall configuration of the hydraulic excavator 1 will be described with reference to FIGS. 1 to 6.

As shown in FIGS. 1 to 5, the hydraulic excavator 1 includes a traveling body 10 configured to be able to travel, a swivel body 20 provided on the upper part of the traveling body 10 so as to be horizontally swiveled, and a front portion of the swivel body 20. It is configured to have an excavator device 30 provided in the above.

The traveling body 10 is configured to include a pair of left and right crawler mechanisms 15 having a driving wheel, a plurality of driven wheels, and a crawler band 14 hung around these wheels on both the left and right sides of the traveling body frame 11. The left and right crawler mechanisms 15 have left and right traveling motors 16 for rotationally driving the drive wheels. The traveling body 10 is configured to be able to travel in an arbitrary direction and speed by controlling the rotation direction and the rotation speed of the left and right traveling motors 16, respectively. A blade 18 is provided on the front portion of the traveling body frame 11 so as to be swingable up and down. The blade 18 is configured to be able to swing up and down by expanding and contracting the blade cylinder 19 straddling the traveling body frame 11.

A turning mechanism 5 is provided at the center of the upper part of the traveling body frame 11. The swivel mechanism 5 is provided on the inner ring fixed to the traveling body frame 11, the outer ring fixed to the swivel body 20, the swivel motor 8 provided on the swivel body 20 (see FIG. 6), and the swivel body 20. It has a rotary center joint for supplying hydraulic oil to the left and right traveling motors 16 and blade cylinders 19 and the like provided on the traveling body 10 from the hydraulic pump 64 (see FIG. 6). The swivel body 20 is provided on the traveling body frame 11 so as to be horizontally swiveled via a swivel mechanism 5, and can be swiveled horizontally with respect to the traveling body 10 by operating the swivel motor 8 in the forward or reverse direction. Has been done.

The swivel body 20 has a swivel body frame 21 provided on the traveling body frame 11 so as to be horizontally swivelable via the swivel mechanism 5, and an operator cabin 25 provided on the swivel body frame 21. A swivel body side bracket 22 projecting forward is provided on the front portion of the swivel body frame 21.

The excavator device 30 is vertically swingable by a shovel side bracket 31 provided on the swivel body side bracket 22 so as to be swingable in the left-right direction around the vertical axis, and a first pivot pin P1 at the upper end of the shovel side bracket 31. A boom 32 provided (freely undulating), an arm 33 provided at the tip of the boom 32 so as to be vertically swingable (flexible and stretchable) by a second pivot pin P2, and a second arm 33 at the tip of the arm 33. It has a bucket 34 provided so as to be vertically rockable by the three pivot pin P3. Further, the excavator device 30 includes a swing cylinder 35 straddled between the swivel frame 21 and the excavator side bracket 31, a boom cylinder 36 straddled between the excavator side bracket 31 and the boom 32, and a boom 32. An arm cylinder 37 straddled between the arms 33, a bucket cylinder 38 straddled between the arm 33 and the bucket 34, and a link mechanism 39 provided between the rod tip of the bucket cylinder 38 and the bucket 34. And have.

The excavator side bracket 31 is configured to be swingable in the left-right direction with respect to the swivel body side bracket 22 (swivel body frame 21) by expanding and contracting the swing cylinder 35. The boom 32 is configured to be able to swing (up and down) in the vertical direction with respect to the excavator side bracket 31 by expanding and contracting the boom cylinder 36. The arm 33 is configured to be able to swing (bend and stretch) in the vertical direction with respect to the boom 32 by expanding and contracting the arm cylinder 37. The bucket 34 is configured to be swingable in the vertical direction with respect to the arm 33 via the link mechanism 39 by expanding and contracting the bucket cylinder 38.

Instead of the bucket 34, various attachments such as a breaker, a crusher, a cutter, and an auger device can be swingably attached to the tips of the arm 33 and the link mechanism 39 in the vertical direction. When these attachments are attached, a plurality of connection port PTs to which a hydraulic hose for supplying hydraulic oil to supply hydraulic oil to the hydraulic actuator of the attachment can be connected are arranged on both left and right sides of the arm 33.

The operator cabin 25 is formed in a substantially rectangular box shape to form an operation room on which an operator can board, and a cabin door 26 that can be opened and closed sideways is provided on the left side portion. Inside the operator cabin 25, there are an operator seat on which an operator can sit facing forward, left and right traveling operation levers 41 and 42 (see FIG. 6) for operating the traveling body 10, and a swivel body 20. Left and right work operation levers 43 and 44 (see FIG. 6) for turning and operating the excavator device 30, and a swing operation pedal 45 (see FIG. 6) for swinging the excavator device 30. 6), a blade operating lever 46 (see FIG. 6) that operates the blade 18, a display device that displays various vehicle information on the hydraulic excavator 1, and various operation switches operated by the operator. And are provided. A pedal portion is provided at the lower end portions of the traveling operation levers 41 and 42, and the operator can also perform the traveling operation of the traveling body 10 with his / her foot using this pedal portion.

The swivel body 20 is provided with mounting chambers for mounting the hydraulic drive device 60 at positions on the rear side and the right side of the operator cabin 25. A curved counterweight 27 and an engine cover 28 that can be opened and closed vertically are provided on the rear side wall portion forming the mounting chamber. A side cover 29 and a refueling hose cover 105 that can be opened and closed vertically are provided on the right wall portion forming the mounting chamber. As shown in FIG. 6, the hydraulic drive device 60 includes an engine 61, a fuel tank (not shown) for storing fuel for driving the engine 61, a hydraulic oil tank 63 for storing hydraulic oil, and the engine 61. To drive the driven hydraulic pump 64 and pilot pump 65, the control valve unit 66 that controls the supply direction and supply amount of the hydraulic oil discharged from the hydraulic pump 64 and supplied to each hydraulic actuator, and the control valve unit 66. It has a pilot valve unit 67 that generates the pilot pressure of the above. Inside the refueling hose cover 105, a refueling device (refueling hose or the like) for refueling the fuel tank is provided.

The control valve unit 66 includes control valves CV1 to CV9 corresponding to the left and right traveling motors 16, blade cylinders 19, swivel motors 8, swing cylinders 35, boom cylinders 36, arm cylinders 37, bucket cylinders 38, and connection port PTs, respectively. Have. In each of these control valves CV1 to CV9, the spool built in is moved by the pilot pressure supplied from the pilot valve unit 67, and the movement of the spool controls the supply direction and supply amount of the hydraulic oil supplied to each hydraulic actuator. It is designed to do.

The pilot valve unit 67 includes a left travel pilot valve unit PV1 disposed at the root of the left travel operation lever 41, a right travel pilot valve unit PV2 disposed at the root of the right travel operation lever 42, and left work. The left working pilot valve unit PV3 arranged at the root of the operating lever 43, the right working pilot valve unit PV4 disposed at the root of the right working operating lever 44, and the swing operating pedal 45 at the root. It has a swing pilot valve unit PV5 and a blade pilot valve unit PV6 arranged at a root portion of a blade operating lever 46. Each of these pilot valve units PV1 to PV6 is configured to include a plurality of pilot valves, and based on the pressure oil supplied from the pilot pump 65, the pilots according to the tilting operation direction and the operation amount of each operating lever or the like. It is designed to generate pressure and supply it to the corresponding control valve.

In the hydraulic excavator 1 configured in this way, when the left and right traveling operation levers 41 and 42 arranged in front of the operator seat in the operator cabin 25 are tilted back and forth, the operation direction and the operation amount are increased. Pilot pressure is generated by the left and right traveling pilot valve units PV1 and PV2. Then, the control valves CV1 and CV2 corresponding to the left and right traveling motors 16 are driven by the pilot pressure, and hydraulic oil is supplied to the left and right traveling motors 16. In this way, the left and right crawler mechanisms 15 can be operated in the traveling direction and traveling speed according to the operating directions and operating amounts of the left and right traveling operation levers 41 and 42 to allow the hydraulic excavator 1 to travel. ing.

When the left and right work operation levers 43 and 44 arranged on the left and right of the operator seat are tilted back and forth and left and right, pilot pressure is generated by the left and right work pilot valve units PV3 and PV4 according to the operation direction and operation amount. To. Then, the control valves CV4, CV6 to CV9 corresponding to the swivel motor 8, the boom cylinder 36, the arm cylinder 37, the bucket cylinder 38, and the connection port PT are driven by the pilot pressure, and the operation directions of the left and right work operation levers 43 and 44 are driven. Hydraulic oil is supplied to the hydraulic actuator corresponding to. When the swing operation pedal 45 is depressed to the left or right, a pilot pressure is generated by the swing pilot valve unit PV5 according to the operation direction and the operation amount, and the control valve CV5 is driven by the pilot pressure to drive the hydraulic oil to the swing cylinder 35. Is supplied.

When the blade operating lever 46 is tilted back and forth, a pilot pressure is generated by the blade pilot valve unit PV6 according to the operation direction and operation amount, and the control valve CV3 is driven by the pilot pressure to drive the hydraulic oil to the blade cylinder 19. Is supplied. In this way, the swivel body 20, the excavator device 30, and the blade 18 are operated in the operating direction and operating speed according to the operating direction and operating amount of the left and right work operating levers 43, 44, the swing operating pedal 45, and the blade operating lever 46. It is configured so that excavation work can be performed.

Next, the tilt-up structure of the operator cabin 25 will be described with reference to FIGS. 7 to 24. A swivel motor 8 and a control valve unit 66 and the like are arranged below the operator cabin 25 in the swivel frame 21, and the operator cabin 25 is located on the front end side of the operator cabin 25 in order to perform maintenance work and the like. It is configured to be swingable (tilt up) so that the rear end side moves upward around the pivotal connection portion (see FIG. 13).

As shown in FIGS. 7 to 9, the pivot structure 300 includes a pair of left and right frame-side support members 310 and 310 provided on the swivel frame 21, and a pair of left and right support members 310 and 310 provided on the front end side of the bottom of the operator cabin 25. The cabin side support members 320 and 320 are provided. The left and right frame-side support members 310 and 310 each have a plate-shaped base portion 311 fixed to the swivel frame 21 by bolts and a plate-shaped frame-side support portion 312 extending upward on the base portion 311. ing. The left and right cabin side support members 320 and 320 are a pair of left and right plate-shaped cabin side support portions 321, 3 extending forward from the bottom front end side of the operator cabin 25, respectively.
Has 21. The frame side support portion 312 is arranged between the left and right cabin side support portions 321 and 321.

Further, as shown in FIGS. 10 to 12, the pivot structure 300 further includes a cylindrical vibration-proof rubber 330 provided in the frame-side support portion 312 and a cylinder provided in a state of being inserted in the vibration-proof rubber 330. It has a bearing member 340 having a shape, and a pivot shaft 350 provided in the cabin side support portion 321 and inserted through the bearing member 340 and rotatable relative to the bearing member 340. A rubber mounting hole penetrating in the left-right direction is formed in the frame-side support portion 312, and the anti-vibration rubber 330 is inserted into the rubber mounting hole. An annular recess is formed on each of the left and right side surfaces of the anti-vibration rubber 330. The shape, material (hardness), etc. of the anti-vibration rubber 330 are set so as to have a spring constant that does not transmit the vibration corresponding to the vibration transmitted from the engine 61 to the operator cabin 25 via the swivel frame 21. Has been done. The anti-vibration rubber 330 is provided with a bearing mounting hole penetrating in the left-right direction, and the bearing member 340 is inserted into the bearing mounting hole.

Shaft insertion holes penetrating in the left-right direction are formed in the left and right cabin-side support portions 321 and 321, respectively, and the pivot shaft 350 is inserted through the shaft insertion holes and the bearing member 340. The pivot shaft 350 is rotatable relative to the bearing member 340. The pivot shaft 350 is fixed to the left cabin side support portion 321 by a bolt via a fixing plate 351 provided on the left end side.

A plate-shaped stopper member 360 extending upward is fixed on the base portion 311 of the frame-side support member 310 by bolts. The stopper member 360 is formed with a stopper hole 361 penetrating in the left-right direction. The stopper hole 361 is a hole having a size larger than the diameter of the pivot shaft 350 and smaller than the outer diameter of the anti-vibration rubber 330. The stopper member 360 is arranged so that the right end side of the pivot shaft 350 is inserted into the stopper hole 361. The stopper member 360 is configured such that when the operator cabin 25 swings and the anti-vibration rubber 330 is deformed beyond an allowable amount, the right end side of the pivot shaft 350 comes into contact with the inner surface of the stopper hole 361. In such a pivot structure 300, the pivot shaft 350 rotates relative to the bearing member 340 provided in the vibration-proof rubber 330 in the inserted state, so that the operator cabin 25 is centered on the pivot shaft 350. The operator cabin 25 can be tilted up so that the rear side moves upward.

As described above, in the pivot structure 300, the bearing member 340 is provided in a state of being inserted into the cylindrical anti-vibration rubber 330, and the pivot connection shaft 350 is provided in a state of being inserted into the bearing member 340. It has a structure. Therefore, the vibration transmitted from the swivel frame 21 to the operator cabin 25 by the engine 61 or the like can be reliably blocked by the vibration-proof rubber 330. Further, since the pivot shaft 350, the bearing member 340, and the vibration-proof rubber 330 can be handled as an integral part, the number of parts can be reduced and the assembly work can be made more efficient. Further, the pivot structure 300 includes a stopper member 360 arranged so that the right end portion of the pivot shaft 350 is inserted into the stopper hole 361. Therefore, when the operator cabin 25 swings and the anti-vibration rubber 330 is deformed, the pivot shaft 350 comes into contact with the inner surface of the stopper hole 361, so that the anti-vibration rubber 330 is deformed beyond the allowable amount. Can be prevented.

As shown in FIG. 13, a gas spring unit 400 for providing an auxiliary force for tilting up the operator cabin 25 is arranged on the rear side of the operator cabin 25. As shown in FIGS. 14 and 15, the gas spring unit 400 includes a connecting plate 405, two first and second gas springs 410 and 420 arranged in parallel with the connecting plate 405, and first and first gas spring units. It has a third gas spring 430 arranged on the connecting plate 405 so as to be connected in series with the two gas springs 410 and 420.

The first to third gas springs 410 to 430 each have a tube having a closed structure, a piston and a rod sliding in the tube, and compressed gas and oil enclosed in the tube, and are opposite to the compressed gas. It is configured so that the force can be obtained as a spring force. The first to third gas springs 410 to 430 are provided with ball joints 450 at the tube side end and the rod side end, respectively. The ball joint 450 has a ball stud and a socket that comes into spherical contact with the ball stud, and is configured to be rotatable in any direction.

The first and second gas springs 410 and 420 have tube side ends attached to the upper front surface of the connecting plate 405 via a ball joint 450, respectively, and the rod can slide downward with respect to the tube. The side end is attached to the swivel frame 21 via a ball joint 450. The third gas spring 430 has a rod side end attached to the lower part of the front surface of the connecting plate 405 via a ball joint 450, the tube can slide upward with respect to the rod, and the tube side end is a ball joint. It is attached to the operator cabin 25 via the 450.

In such a gas spring unit 400, when the operator cabin 25 is tilted up with respect to the swivel frame 21 about the pivot structure 300 (the pivot shaft 350), as shown in FIGS. 13 and 16, the beginning is started. The first and second gas springs 410 and 420 are configured to extend and operate. When tilting up the operator cabin 25, a large force is required at the beginning of raising, so two first and second gas springs 410 and 420 are arranged in parallel so that a large auxiliary force to assist the force can be applied. It is set up. Then, when the first and second gas springs 410 and 420 are extended to the maximum, the third gas spring 430 is configured to be extended and operated as shown in FIGS. 17 and 18.

When the operator cabin 25 is tilted up to a predetermined position shown in FIG. 17 (for example, a position where the tilt-up angle is 35 degrees), the operator cabin 25 is pivotally connected to the front side of the bottom of the operator cabin 25 (near the cabin side support member 320 on the left side). A tilt lock pin 385 provided on the swivel frame 21 is inserted into the lock groove of the tilt lock member 380, whereby the operator cabin 25 is locked in a tilted-up state.

When the tilt lock member 380 is swung to release the locked state by the lock groove and the tilt lock pin 385, the operator cabin 25 is in a state where it can be tilted down. When the operator cabin 25 is tilted down, as shown in FIG. 19, the third gas spring 430 is initially reduced. As the third gas spring 430 shrinks, the upper end of the connecting plate 405 comes into contact with the spring stopper member 460 provided at the rear of the operator cabin 25, and then the first and second gas springs 410 and 420 shrink. Operate. An inclined portion that descends rearward is provided on the lower surface side of the spring stopper member 460. When the upper end of the connecting plate 405 comes into contact with the inclined portion, the posture of the gas spring unit 400 in the rotational direction is adjusted to a normal state. The operator cabin 25 is fixed to the swivel body frame 21 by using the cabin fixing bolt in the tilted down state. The cabin fixing bolts are arranged at two locations on the left and right sides of the gas spring stopper member 460.

As described above, the gas spring unit 400 is configured by connecting three first to third gas springs 410 to 430 in series. Therefore, the stroke at the time of extension can be made longer than that of one gas spring, and the tilt-up angle of the operator cabin 25 can be made larger than the conventional one. Therefore, when performing maintenance work on equipment such as the swivel motor 8 and the control valve unit 66 arranged below the operator cabin 25, a large work space can be taken and the efficiency of the maintenance work can be improved. ..

In the gas spring unit 400, two first and second gas springs 410 and 420 arranged in parallel and one third gas connected in series with the two gas springs 410 and 420. It is configured to have a spring 430. Therefore, the largest force is required when starting to tilt up the operator cabin 25, but the force is assisted by the two parallel first and second gas springs 410 and 420 to smoothly tilt up the operator cabin 25. Can be made to. Further, the first to third gas springs 410 to 430 are connected to the swivel body frame 21 and the operator cabin 25 via ball joints 450, respectively. Therefore, even when an eccentric load is applied while the first to third gas springs 410 to 430 are extended, the eccentric load can be released by the ball joint 450, and the connection portion between the swivel frame 21 and the operator cabin 25 can be released. Can be prevented from being damaged.

Further, the gas spring unit 400 is arranged on the rear side of the operator cabin 25. Therefore, when the maintenance work is performed from the side of the swivel body frame 21, the gas spring unit 400 can perform the work without interfering with the maintenance work. Further, since the gas spring unit 400 is arranged on the rear side of the operator cabin 25, the gas spring unit 400 does not enter the operator cabin 25 and narrow the living space, and the living space in the operator cabin 25 is kept wide. be able to. Further, the gas spring unit 400 and other devices can be arranged without the gas spring unit 400 interfering with other devices in the swivel frame 21.

As shown in FIG. 20, a lock mechanism 500 that regulates the tilt-up of the operator cabin 25 is arranged on the left side of the rear portion of the operator cabin 25. As shown in FIGS. 20 and 21, the lock mechanism 500 is pivotally connected to a lock pin 510 provided in the operator cabin 25 extending in the front-rear direction and a swivel frame 21, and is a lock plate capable of engaging with the lock pin 510. It has a 520 and a spring member 530 that urges the lock plate 520 in the engagement direction with the lock pin 510.

The lock plate 520 is provided on the swivel frame 21 so as to be swingable in the left-right direction around the rotary shaft 521 provided at the lower portion, and is swinging to the left by the spring member 530 provided in the vicinity of the rotary shaft 521. The power of is given. A substantially circular lock recess 525 opened to the left is formed substantially in the center of the upper and lower sides of the lock plate 520. An inclined surface 526 that descends to the left is formed on the upper end side of the lock plate 520.

On the rear side of the operator cabin 25, a cylindrical rod insertion member 540 extending in the left-right direction is provided below the lock pin 510, and the unlock rod 550 can be inserted into the rod insertion member 540 from the left. ing. A flange portion 551 is formed on the unlocking rod 550, and the flange portion 551 abuts on the rod insertion member 540 so that the unlocking rod 550 cannot be further inserted.

In such a lock mechanism 500, when the operator cabin 25 is fixed to the swivel frame 21 by using the cabin fixing bolt, the lock pin 510 is inserted into the lock recess 525 of the lock plate 520. .. However, at this time, there is a predetermined gap between the lock pin 510 and the inner surface of the lock recess 525, and the lock pin 510 and the inner surface of the lock recess 525 are in a non-contact state. Therefore, when the operator cabin 25 is fixed to the swivel body frame 21 by the cabin fixing bolt, the tilt-up restriction of the operator cabin 25 by the lock mechanism 500 (lock pin 510 and lock plate 520) is not performed. There is.

On the other hand, when the operator cabin 25 is not fixed by the cabin fixing bolts and the rear side of the operator cabin 25 moves upward, the lock pin 510 provided in the operator cabin 25 comes into contact with the upper part of the inner surface of the lock recess 525 of the lock plate 520. The upward movement of the lock pin 510 is restricted, thereby restricting the tilt-up of the operator cabin 25.

In order to release the tilt-up restriction by the lock mechanism 500 and tilt up the operator cabin 25, first, the cabin fixing bolt fixing the operator cabin 25 to the swivel body frame 21 is removed. Then, as shown in FIG. 22, the lock release rod 550 is inserted into the rod insertion member 540 provided in the operator cabin 25 from the left side. The tip of the unlocking rod 550 inserted into the rod insertion member 540 abuts on the lock plate 520, and the lock plate 520 is swung to the right around the rotation shaft 521. When the lock plate 520 is swung to the right in this way, the lock pin 510 arranged in the lock recess 525 of the lock plate 520 changes to the arrangement relationship located outside the lock recess 525.

Then, by lifting the lock release rod 550 inserted into the rod insertion member 540, a force for tilting up the operator cabin 25 can be applied as shown in FIGS. 23 and 24. When the lock release rod 550 is lifted, the tips of the lock pin 510 and the lock release rod 550 move upward together with the operator cabin 25 while sliding on the left side surface and the inclined surface 526 of the lock plate 520, and tilt the operator cabin 25. Can be up. At this time, the gas spring unit 400 provides an auxiliary force for tilting up.

When tilting down the operator cabin 25, the unlocking rod 550 is inserted into the rod insertion member 540, and the unlocking rod 550 is pushed down to exert a force for tilting down the operator cabin 25. When the unlocking rod 550 is pushed down, as shown in FIG. 24, the tip of the unlocking rod 550 first comes into contact with the inclined surface 526 of the lock plate 520 and slides downward on the inclined surface 526. Due to this sliding, the lock plate 520 is swung to the right around the rotation shaft 521. When the unlocking rod 550 is further pushed down, as shown in FIG. 23, the tip of the unlocking rod 550 and the lock pin 510 slide down together with the operator cabin 25 while sliding on the inclined surface 526 and the left side surface of the lock plate 520. Move. Then, as shown in FIG. 22, the operator cabin 25 can be tilted down to a position where the lock pin 510 is inserted into the lock recess 525 of the lock plate 520. The operator cabin 25 tilted down in this way is fixed to the swivel body frame 21 by using the cabin fixing bolts as described above.

As described above, the lock mechanism 500 that regulates the tilt-up of the operator cabin 25 is provided in parallel with the cabin fixing bolt that fixes the operator cabin 25 to the swivel body frame 21. When the operator cabin 25 is fixed by the cabin fixing bolt, the lock mechanism 500 is not regulated, and when the cabin fixing bolt is released, the lock mechanism 500 is regulated. Therefore, even if the cabin fixing bolt is loosely tightened or damaged, the lock mechanism 500 can prevent the operator cabin 25 from swinging and floating, thereby ensuring the safety inside the operator cabin 25. Can be secured. Further, by providing the lock mechanism 500, the size and number of the cabin fixing bolts can be reduced, and the bolt attachment / detachment work can be made more efficient.

In the lock mechanism 500, the lock release rod 550 is inserted into the rod insertion member 540 provided in the operator cabin 25, the lock plate 520 is swung to release the engagement state with the lock pin 510, and the lock in the inserted state is released. By lifting the release rod 550, a force for tilting up the operator cabin 25 can be applied. Therefore, the restriction can be easily released by the lock mechanism 500 and the operator cabin 25 can be tilted up easily. Further, the lock mechanism 500 is configured so that the lock pin 510 and the lock plate 520 are in a non-contact state when the operator cabin 25 is fixed to the swivel body frame 21 by the cabin fixing bolt. Therefore, it is possible to prevent the vibration of the swivel frame 21 from being transmitted to the operator cabin 25 via the lock plate 520 and the lock pin 510.

Although the embodiments of the present invention have been described so far, the scope of the present invention is not limited to the above-described embodiments. For example, in the above-described embodiment, the anti-vibration rubber 330 is provided on the support portion 312 on the swivel body frame 21 side, and the pivot shaft 350 is provided on the support portion 321 on the operator cabin 25 side. However, the support portion on the operator cabin 25 side is arranged between the left and right support portions on the swivel body frame 21 side, the anti-vibration rubber 330 is provided on the support portion on the operator cabin 25 side, and the swivel body frame 21 side. A pivotal shaft 350 may be provided on the support portion of the rubber. Further, in the above-described embodiment, the case where the present invention is applied to the hydraulic excavator 1 has been described, but the present invention is also applied to a work vehicle other than the hydraulic excavator, for example, another work vehicle such as a crawler loader. You can also.

1 Hydraulic excavator 20 Swing body 21 Swing body frame (body frame)
25 Operator Cabin 300 Pivot connection structure 330 Anti-vibration rubber 340 Bearing member 350 Pivot connection shaft 360 Stopper member

Claims (2)

In a work vehicle provided on a vehicle body frame and equipped with an operator cabin that forms an operation room.
The operator cabin can swing around the pivot portion on the one end side so that one end side is pivotally connected to the vehicle body frame and the other end side moves up and down.
On the other end side of the operator cabin, a gas spring unit that applies an auxiliary force for tilting up the operator cabin around the pivot portion is arranged between the operator cabin and the vehicle body frame.
The gas spring unit has first and second gas springs arranged in parallel and a third gas spring connected in series with the first and second gas springs.
The pivotal structure that pivotally connects the one end side to the vehicle body frame
Cylindrical anti-vibration rubber provided on the support portion on one side of the vehicle body frame and the operator cabin, and
A cylindrical bearing member provided in a state of being inserted into the vibration-proof rubber, and
A work vehicle provided on a support portion on the other side of the vehicle body frame and the operator cabin, and provided with a pivot shaft that is inserted through the bearing member and can rotate relative to the bearing member. The support portion on one side has a hole portion larger than the diameter of the pivotal shaft and smaller than the outer diameter of the vibration-proof rubber, and the end portion of the pivotal shaft is inserted into the hole portion. The work vehicle according to claim 1, further comprising a stopper member arranged in the above.

Images