JP5309165B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine, and more particularly to a construction machine such as a dump truck.

Conventionally, in a dump truck as a construction machine, a mounting device that absorbs and attenuates vibration of the cab is interposed between the body frame and the cab, and the cab can be rotated up and down with respect to the mounting device (tilt is possible). It is known to be mounted on (see, for example, Patent Document 1).
The mount device is a liquid-filled configuration including a cup attached to the vehicle body frame side, in which a viscous fluid is sealed, and a cushion rubber and a movable shaft that closes the upper side of the cup. By being connected to the upper bracket of this via a connecting pin, this connecting pin functions as a horizontal rotation shaft.

  In such a dump truck, if the connecting pin moves greatly due to the amplitude of the cab, the movable shaft is also greatly displaced, and this displacement cannot be allowed and the mounting device is damaged. Therefore, on the vehicle body frame side, a pair of stopper pieces are inserted so that both ends of the connection pin are inserted, and the movement of the connection pin is restricted so as not to be displaced beyond the gap between the insertion hole of the stopper piece and the connection pin. This prevents damage to the mounting device.

  For example, when tilting up the cab during maintenance of a hydraulic device or the like, the connecting pin does not tilt when the cylindrical gap filling member is pushed into the gap between the insertion hole of the stopper piece and the connecting pin to eliminate the gap. I am doing so.

JP 2009-61807 A

However, in such a dump truck, it is necessary for a service person who performs maintenance of the dump truck to prepare the gap filling member at the time of tilting the cab, which is complicated.
On the other hand, Patent Document 1 discloses a gap filling member slidably attached to a stopper piece in addition to such a gap filling member. In such a structure, while the gap filling member is slid during the tilting operation and inserted into the connecting pin and finally pushed into the gap with the insertion hole, the structure is complicated.

Further, as the gap filling member is pushed into the gap, the connecting pin protrudes from the stopper piece, so that it becomes difficult to hit the gap filling member with a hammer and to slide it. Alternatively, a dedicated jig for knocking the gap filling member is required.
Furthermore, when the cab is tilted, the gap filling member is inserted into the gap from one end side of the connecting pin, and when the connecting pin is pulled out such as removing the cab, the connecting pin is pulled out from the other end side of the connecting pin. Will do. In other words, work space is required on both sides of the mounting device. However, since various devices such as a fuel tank and piping are arranged around the mount device, it is difficult to secure a sufficient working space.

  The objective of this invention is providing the construction machine which can simplify the support structure of a cab.

  A construction machine according to a first invention includes a vehicle body frame, a mount device mounted on the vehicle body frame, and a cab connected to the mount device so as to be rotatable (tilt up and tilt down) via a connection pin. The body frame is provided with a stopper having an insertion hole through which the connection pin is inserted, and a gap between the insertion hole of the stopper and the connection pin is greater than or equal to a predetermined value in the radial direction of the connection pin. A gap for regulating the amount of displacement is formed, the connecting pin is provided to be movable along the axial direction, and the outer periphery of the connecting pin is inserted into and removed from the gap as the connecting pin moves. The gap filling member is provided integrally.

  In the construction machine according to the second aspect of the present invention, the connection pin is rotatably attached to a mount side bracket provided in the mount device, and the connection pin has a direction orthogonal to the axial direction of the connection pin. A support lever extending to the support lever is fixed, and the mount side bracket is provided with a boss portion positioned between the opposing surfaces of the support lever and fixed to the tip end side of the support lever. Two types having different distances from the bracket are arranged in parallel.

  In the construction machine according to a third aspect of the present invention, the support lever is provided with an extraction tap penetrating in the thickness direction, and the support lever is provided with the extraction lever at one of the two types of boss portions. It is fixed by a fixing bolt that can be screwed into the tap.

  According to the first invention, since the gap filling member is integrally provided on the connecting pin that is movable in the axial direction, when the cab is rotated, when the gap around the connecting pin is filled, the connecting pin is moved to its axis. Therefore, it is not necessary to prepare a gap filling member separately or to make the gap filling member slidable by itself, and the structure can be simplified. Further, it is only necessary to hit the connecting pin itself with a hammer, and this work is facilitated. Furthermore, since the work of inserting the gap filling member into the gap and the work of removing the connecting pin can be performed from the same one end side of the connecting pin, the work space only needs to be provided on one end side of the mounting device.

  According to the second invention, the support lever fixed to the connecting pin is fixed to the boss portion, so that the connecting pin is prevented from rotating and coming off. In this case, the boss portion has a different length. By providing the type, the support lever is fixed in a state where the gap filling member is removed from the gap with respect to one boss portion, and the gap filling member is placed in the gap with respect to the other boss portion. The support lever can be fixed in a state where the connecting pin is inserted, and even when the cab is in either the tilt-down state or the tilt-up state, the connecting pin can be reliably prevented from rotating and coming off.

  According to the third invention, in order to return the connecting pin to the position before the movement, the fixing bolt that has fixed the support lever to the other boss portion may be screwed into the extraction tap and screwed in. Therefore, it is possible to eliminate the trouble of separately preparing a bolt for operation to be screwed to the extraction tap separately from the fixing bolt.

The side view showing the dump truck concerning one embodiment of the present invention. The figure which shows a state when rotating a cab. The elements on larger scale which show a rear side support structure. Sectional drawing which shows the structure of a rear side support structure. It is a figure which shows the state of the rear side support structure when rotating a cab, (A) is the figure seen from the arrow A of FIG. 3, (B) is the figure seen from the arrow B of (A).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
A dump truck 1 as a construction machine shown in FIG. 1 includes a front vehicle body 10 positioned forward (leftward in FIG. 1) and a rear vehicle body 20 positioned rearward (rightward in FIG. 1).
The front vehicle body 10 is supported by a front frame 11 as a vehicle body frame, and a hood 12 is attached to the front frame 11 so as to be openable and closable.
The rear vehicle body 20 is supported by a rear frame 21. The rear frame 21 is connected to the front frame 11 so as to be able to bend and swing.

A pair of left and right steering cylinders 13, 13 are bridged between the front frame 11 and the rear frame 21. By extending and retracting each of the steering cylinders 13 and 13, the rear frame 21 can be refracted with respect to the front frame 11, and the steering operation can be performed.
Above the rear frame 21, for example, a vessel 22 for loading a load such as earth and sand is provided. A pair of lift cylinders 23 are provided between the left and right sides of the front portion of the vessel 22 (the front side and the back side in FIG. 1) and the rear frame 21. The vessel 22 is attached to the rear frame 21 so as to be rotatable about the lower side of the rear portion thereof as a rotation center. The vessel 22 rotates as the lift cylinders 23 and 23 expand and contract.

A cab 30 is mounted on the front frame 11. The cab 30 is a ROPS (Roll Over Protective System) cab having a safe structure so as to ensure the safety of the operator when the dump truck 1 falls. The cab 30 is fixedly supported by the front frame 11 via a pair of rear-side support structures 100B and 100B, which will be described later, in the arrow TU (tilt up) direction and the arrow TD (tilt down) direction shown in FIG. It can be turned.
A pair of left and right front wheels 41 are attached to the lower side of the front frame 11, and a pair of left and right middle wheels 42 and a rear wheel 43 are attached to the lower side of the rear frame 21, respectively.

  As shown in FIG. 2, various devices 14 such as an engine, a torque converter, a transmission, and a hydraulic pump are disposed in a space located below the bonnet 12 and the cab 30. Between the cab 30 and the front frame 11, a front side support structure 100A and a rear side support structure 100B are provided.

Although detailed illustration is omitted, the front side support structure 100A has a connection pin in which a gap filling member 200 described later is not provided in the rear side support structure 100B described later, and the connection pin can be inserted and removed. It is. And by extracting such a connection pin, it is possible to cancel | release the support state by the mounting apparatus in the front side of the cab 30. FIG.
The operator opens the bonnet 12, removes the connecting pin from the front support structure 100 </ b> A, releases the support state, and rotates the cab 30 in the direction of the arrow TU by using operating power such as a hydraulic cylinder or a crane. The various devices 14 are inspected and maintained.

Next, the rear side support structure 100B will be described. In addition, about the code | symbol of the detailed structure of the rear side support structure 100B, a code | symbol is attached | subjected only about one rear side support structure 100B in FIG.
The rear side support structure 100B includes a mount device 110, a mount side bracket 120, a cab side bracket 130, a stopper 140, a connecting pin 150, and a support lever 160.

As shown in FIGS. 3 to 5, the mount device 110 is a device that supports the cab 30, and is mounted on the front frame 11 using bolts 51. The mount device 110 is a liquid-filled mount device in which silicone oil that is a viscous fluid is sealed, and includes a movable shaft 111, a cup 112, and a cushion rubber 113.
The movable shaft 111 has a columnar shape and is erected vertically. A cushion rubber 113 is integrally formed on the outer periphery of the movable shaft 111. The cup 112 is closed in a liquid-tight state by the movable shaft 111 and the cushion rubber 113.
When vibration occurs in the cab 30, the silicon oil is stirred by the displacement of the movable shaft 111, and the vibration is attenuated by the viscous resistance at this time.

The mount side bracket 120 is formed in a substantially J shape by the bottom part 121 and the side part 122.
The bottom 121 is fixed to the movable shaft 111 of the mounting device 110 by a bolt 114.
The side portions 122 are integrally formed to protrude upward from both left and right (left and right directions in FIG. 4) ends of the bottom portion 121, and one side portion 122A is formed to protrude longer than the other side portion 122B. . A mounting hole 123 to which the connecting pin 150 is attached is provided at a position where the side portions 122 face each other, and a boss portion 124 protruding inward is provided on the outer periphery of the mounting hole 123.

The cab-side bracket 130 includes a base portion 131 fixed to the frame on the rear side of the cab 30 using a fixing means such as welding, and a cylindrical attachment portion 132 attached to the lower end of the base portion 131. Yes.
A connection pin 150 is attached to the attachment hole 133 of the attachment portion 132 via a metal bush 134 inserted from both ends thereof, and the cab 30 is rotated by rotating the cab side bracket 130 around the bush 134. It is possible to tilt up and down. In FIG. 5B, the base portion 131 and the attachment portion 132 are not shown.
Further, a grease supply nipple 300 for supplying lubricating oil such as grease is provided at a predetermined position of the mounting portion 132 (see FIG. 3). As shown in FIG. 4, a shim 170 is inserted between the bush 134 and the boss portion 124.

  According to the brackets 120 and 130 described above, the mounting holes 123 and 133 are provided so that their centers are located on the coaxial line. The inner diameter of the mounting hole 123 and the inner diameter of the bush 134 are substantially equal to the outer diameter of the large-diameter portion 150A of the connecting pin 150, and the outer diameter of the bush 134 is substantially equal to the inner diameter of the mounting hole 133. Thus, the cab 30 is supported by the mounting device 110 through the cab side bracket 130, the connecting pin 150, and the mount side bracket 120 with almost no gap.

  The stopper 140 includes a base portion 141 that is fixed to the front frame 11 with a bolt 52 and a pair of side portions 142 that are erected with a space from the base portion 141, and between these side portions 142, The mount device 110 is disposed using an opening provided in the center of the base portion 141. An insertion hole 143 is provided at a position where each side portion 142 faces each other. The insertion hole 143 is also centered on the same axis as the mounting holes 123 and 133, and both end sides of the connecting pin 150 are located in each insertion hole 143. The inner diameter dimension of the insertion hole 143 is larger by a predetermined value (2 × t) than the outer diameter dimension of the large diameter portion 150A.

As shown in FIG. 4, the connecting pin 150 is formed in a substantially cylindrical shape, and has a large-diameter portion 150A having a horizontal length (W1 in the left-right direction in FIG. 4) of W1, and a horizontal length of W2. And a small-diameter portion 150B.
The left and right ends of the large diameter portion 150A protrude outside the side portion 142 of the stopper 140, respectively. An annular gap 144 having a radial dimension t is formed between the outer peripheral surface of the large diameter portion 150A and the inner peripheral surface of the insertion hole 143. Due to the presence of the gap 144, the connecting pin 150 can be displaced by a dimension t in the radial direction (vertical direction in FIG. 4). In other words, the stopper 140 has a predetermined displacement amount t or more. The amount of displacement is regulated.

On the other hand, a support lever 160 extending in a direction orthogonal to the axial direction of the connection pin 150 is inserted into the small diameter portion 150B of the connection pin 150 through a support hole 161 on the base end side, and the support lever 160 is connected. The pin 150 is integrally fixed to the small diameter portion 150B of the pin 150 by welding or the like.
In the connecting pin 150, a substantially cylindrical gap filling member 200 is fixed to the small diameter portion 150 </ b> B and the support lever 160 at the end of the large diameter portion 150 </ b> A on the small diameter portion 150 </ b> B side by welding or the like. Therefore, the connecting pin 150, the support lever 160, and the gap filling member 200 are integrated to form one component. The outer diameter dimension of the gap filling member 200 is substantially equal to the inner diameter dimension of the insertion hole 143 provided in the side portion 142 of the stopper 140. Such a gap filling member 200 is located outside the side portion 142.
On the other hand, a boss portion 162 that protrudes horizontally toward the support lever 160 side is provided on a surface of the side portion 122A of the mount-side bracket 120 that faces the front end side of the support lever 160. As the boss part 162, there are two types of boss part 162A having a long length and a boss part 162B having a short length, which are arranged in parallel (see FIG. 5).

  In FIG. 4, the tip of the support lever 160 is fixed to a long boss portion 162 </ b> A with a fixing bolt 163. In FIG. 5, the connecting pin 150 is moved in the axial direction together with the support lever 160 and is rotated toward the short boss portion 162 </ b> B, and the support lever 160 is fixed to the boss portion 162 </ b> B by the fixing bolt 163 at the moved position. It is fixed to. While the support lever 160 is fixed to the boss portions 162A and 162B, the connecting pin 150 does not rotate or move in the axial direction, and the connecting pin 150 is prevented from coming off. In particular, when the support lever 160 is fixed to the short boss portion 162 </ b> B, the gap filling member 200 is pushed into the insertion hole 143 provided in the side portion 142 of the stopper 140.

  The support lever 160 is provided with a pull-out tap 165 having the same screw diameter as that of the fixing bolt 163. The fixing bolt 163 is screwed into the pull-out tap 165 so that its tip abuts against the side portion 142 and further screwed. By performing the insertion operation, the connection pin 150 together with the support lever 160 can be returned to the original position, and the gap filling member 200 can be removed from the insertion hole 143.

Next, an operation when the cab 30 is rotated in the tilt up direction from the tilted down state will be described.
As shown in FIG. 1, when the cab 30 is tilted down, the support lever 160 is in the position shown in FIG. 4, and the gap filling member 200 attached to the connecting pin 150 is separated from the insertion hole 143 by a predetermined distance. Yes.

  When the cab 30 is rotated in the tilt-up direction, in the state shown in FIG. 4, the fixing bolt 163 is removed from the long boss portion 162A, and the support lever 160 is rotated together with the connecting pin 150 so that the tip thereof becomes the short boss portion 162B. Position. From this state, the hammer strikes the end (the right end in FIG. 4) of the small diameter portion 150B of the connecting pin 150, which is the base end side of the support lever 160. By doing so, the connecting pin 150 is moved together with the support lever 160 and the gap filling member 200 in the left direction in FIG. 4 (the vehicle body outer side direction), the gap filling member 200 is pushed into the insertion hole 143, and the gap 144 is filled. With this operation, the connecting pin 150, the support lever 160, and the gap filling member 200 are moved from the position indicated by the two-dot chain line to the position indicated by the solid line in FIG. Then, the support lever 160 is fixed to the boss 162B with the fixing bolt 163. Similarly to the rear side support structure 100B arranged on the right side of the vehicle body in FIG. 3, the rear side support structure 100B arranged on the left side of the vehicle body in FIG. The movement axis centers coincide with each other on the left and right sides, and the rotation axis of the cab 30 is not shaken.

With the gap filling member 200 inserted into the gap 144, a force in the direction of the arrow TU in FIG. 2 is applied to the cab 30, and the cab 30 is tilted up with the connecting pin 150 as a rotation axis.
Note that when the cab 30 is rotated from the tilt-up state to the tilt-down state, the gap filling member 200 is inserted into the gap 144 as in the case of tilting up.
When the connecting pin 150 is returned to the original position, the fixing bolt 163 is pulled out and screwed into the tap 165 and returned together with the support lever 160 and the gap filling member 200, and the gap filling member 200 is removed from the gap 144. The support lever 160 returned to the original position is fixed to the boss portion 162A with the fixing bolt 163.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the above-described embodiment, the articulated dump truck 1 in which the body frame is configured by the front frame 11 and the rear frame 21 has been described as a construction machine, but a rigid dump truck having a single body frame, Other construction machines such as a hydraulic excavator and a bulldozer may be used.

In the above-described embodiment, the liquid-sealed mounting device has been described as the mounting device 110. However, other types of mounting devices using rubber, springs, or the like may be used.
Further, even in the liquid-sealed mounting device, a disc-shaped damping plate is provided at the lower end of the movable shaft, and a coil spring that biases the movable shaft upward is provided between the damping plate and the bottom surface of the cup. A mounting device having a structure may be adopted. In this mounting device, a flange portion is formed on the outer periphery of the damping plate, and when a vibration is generated, the viscous fluid moves in a gap space between the flange portion and the inner wall of the cup facing the flange portion. Vibration can be damped efficiently by resistance. In the mounting device, the cushion rubber also employs a structure in which rubber cylinders and metal cylinders are alternately laminated around the movable shaft in the radial direction, so that the vibration in the direction in which the movable shaft tilts is ensured. Absorption and attenuation are possible.

  The present invention can be used for other construction machines having a tiltable cab in addition to a dump truck.

  DESCRIPTION OF SYMBOLS 1 ... Dump truck which is a construction machine, 11 ... Front frame which is a vehicle body frame, 30 ... Cab, 110 ... Mounting device, 120 ... Mount side bracket, 140 ... Stopper, 143 ... Insertion hole, 144 ... Gap, 150 ... Connection pin , 160: support lever, 162, 162A, 162B ... boss, 163 ... fixing bolt, 165 ... extraction tap, 200 ... gap filling member.

Claims (3)

Body frame,
A mounting device mounted on the body frame;
A cab rotatably connected via a connecting pin on the mounting device;
The vehicle body frame is provided with a stopper having an insertion hole through which the connecting pin is inserted,
Between the insertion hole of the stopper and the connecting pin, a gap is formed that regulates a displacement amount not less than a predetermined amount in the radial direction of the connecting pin,
The connecting pin is provided movably along the axial direction,
A construction machine characterized in that a gap filling member that is inserted into and removed from the gap as the connection pin moves is provided integrally on the outer periphery of the connection pin. The construction machine according to claim 1,
The connecting pin is rotatably attached to a mount side bracket provided in the mount device,
A support lever extending in a direction perpendicular to the axial direction of the connection pin is fixed to the connection pin,
The mount-side bracket is provided between a surface facing the support lever, and provided with a boss portion to which a front end side of the support lever is fixed,
As the boss portion, two types having different distances from the mount-side bracket are arranged in parallel. The construction machine according to claim 2,
The support lever is provided with an extraction tap penetrating in the thickness direction,
The construction machine, wherein the support lever is fixed to one of the two types of boss portions by a fixing bolt that can be screwed into the extraction tap.

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