JP6985078B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle including a bonnet covering an engine.

Conventionally, a work vehicle having a structure in which a bonnet or the like covering an engine can be opened and closed has been known in order to improve maintainability of the engine or the like. Patent Documents 1 and 2 disclose this type of work vehicle.

The construction machine disclosed in Patent Document 1 is provided with an engine room in which the upper surface and the rear surface are open. A bonnet covering the upper surface opening and the rear surface opening of the engine room is provided in a state of rotating around a bonnet shaft arranged at the front end portion of the bonnet to open and close the opening. According to the drawing of Patent Document 1, a recess for holding a hand is formed in the lower part of the back surface of the bonnet.

The work vehicle disclosed in Patent Document 2 is provided with a hinge mechanism at the front end of the tilt floor so that the tilt floor can be rotated forward of the vehicle body. Further, this work vehicle is provided with a torsion bar for rotating the tilt floor and a spring cylinder for assisting the rotation.

Japanese Unexamined Patent Publication No. 2010-265582 Japanese Unexamined Patent Publication No. 2005-001645

Patent Document 1 does not particularly describe how to open and close the bonnet, but it is considered that the bonnet is rotated by applying a force to the recess on the back surface of the bonnet with one hand. .. Since the bonnet has a considerable weight, it may not be possible to smoothly open and close the bonnet by simply applying force with one hand.

On the other hand, it is difficult to secure a space for installing a torsion bar or the like disclosed in Patent Document 2 when it is intended to be applied to a work vehicle such as a small mini excavator.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a work vehicle capable of easily opening and closing a bonnet with few restrictions on an installation space.

Means and effects to solve problems

The problem to be solved by the present invention is as described above, and next, the means for solving this problem and its effect will be described.

From the viewpoint of the present invention, a work vehicle having the following configuration is provided. That is, this work vehicle includes a bonnet, a first handle, and a second handle. The bonnet is rotatably supported around a rotation axis located behind the engine, covers the engine, and can be opened and closed. The first handle is arranged in front of the bonnet. The second handle is arranged on the bonnet at a position higher than the first grip portion.

As a result, the bonnet can be opened and closed by grasping the two handles with one hand and using both hands. Therefore, the opening and closing work of the bonnet can be easily and smoothly performed. Therefore, even when it is difficult to install an auxiliary device for urging the bonnet in the opening direction, the maintainability of the engine or the like can be improved.

The above-mentioned work vehicle preferably has the following configuration. That is, this work vehicle includes a driver's seat attached to the upper surface of the bonnet. At least a part of the second handle can be stored in the space formed between the bonnet and the driver's seat.

As a result, when it is not necessary to touch the second handle, it can be stored in a place that does not get in the way.

The work vehicle may have the following configuration. That is, the second handle is an elongated strip having flexibility. Both ends in the longitudinal direction of the second handle are attached to the bonnet, and the intermediate portion can be stored in the space.

This makes it possible to realize a simple and inexpensive configuration in which the second handle can be stored.

In the work vehicle, the second handle is slidable and can be configured to be retractable in the space by moving to one side.

As a result, it can be stored as needed by a simple operation of sliding the second handle.

The above-mentioned work vehicle preferably has the following configuration. That is, this work vehicle is provided with a lock mechanism that can be locked with the bonnet closed and can be unlocked by operating the first handle. The lock mechanism is unlocked by an operating force for operating the first handle in the direction of opening the bonnet.

As a result, the lock can be released by the operating force in the direction of opening the bonnet, so that the bonnet can be released without taking time and effort to release the lock.

The side view which shows the overall structure of the work vehicle which concerns on one Embodiment of this invention. A perspective view of the work vehicle viewed from diagonally above. A perspective view of the unlocked handle and the belt of the first embodiment as viewed from the front side. The side schematic diagram explaining the function of a bonnet stay. The perspective view which shows the retractable handle of 2nd Embodiment.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an overall configuration of a turning work vehicle 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the turning work vehicle 1 as viewed from above.

The turning work vehicle (working vehicle) 1 of the present embodiment shown in FIGS. 1 and 2 includes a lower traveling body 11 and an upper turning body 12.

The lower traveling body 11 includes a crawler traveling device 21 arranged in a pair on the left and right, and a hydraulic motor (not shown) for driving the crawler traveling device 21. The lower traveling body 11 can individually drive the left and right crawler traveling devices 21 in various directions and speeds to perform various traveling such as straight forward or backward traveling and steering.

The upper swivel body 12 includes a swivel frame 31, an engine 33, a hydraulic pump unit 34, a bonnet 38, a control unit 35, and a working device 13.

The swivel frame 31 is arranged above the lower traveling body 11 and is rotatably supported by the lower traveling body 11 about a vertical axis. The swivel frame 31 can be rotated with respect to the lower traveling body 11 by driving a swivel motor (not shown). The engine 33 is configured as, for example, a diesel engine and is located behind the swivel frame 31. The hydraulic pump unit 34 is driven by the engine 33 to generate the hydraulic pressure required for traveling and working of the turning work platform 1.

The bonnet 38 covers and protects the upper surface of the engine 33 and the like. As shown in FIG. 2, the rear portion of the bonnet 38 is connected to the swivel frame 31 by a pair of left and right hinge portions 45 arranged at the rear portion of the swivel frame 31.

As a result, the bonnet 38 can be rotated with respect to the swivel frame 31 about the rotation shaft 45c arranged in the left-right horizontal direction. Specifically, the bonnet 38 can be rotated backward and upward to be in the open state, and rotated in the opposite direction to be in the closed state.

The control unit 35 includes various operating members. The operation member includes a traveling operation lever 36 and a work operation lever 37 arranged in a pair on the left and right. The operator can give various instructions to the turning work vehicle 1 by operating the above-mentioned operating member.

The working device 13 includes a boom 41, an arm 42, and a bucket 43. A hydraulic cylinder is connected to each of the boom 41, the arm 42, and the bucket 43, and by expanding and contracting the hydraulic cylinder, various operations such as excavation by the bucket 43 can be performed.

As shown in FIG. 2, a driver's seat 39 on which an operator sits is arranged at the center on the left and right of the upper surface of the upper swivel body 12. However, in FIG. 2, the driver's seat 39 is drawn with a chain line in order to show the belt 72 and the like described later in an easy-to-understand manner. The consoles 52 are arranged in pairs on the left and right so as to sandwich the driver's seat 39. The driver's seat 39 and the console 52 are arranged on the upper surface of the bonnet 38 included in the upper swivel body 12.

The left and right consoles 52 are symmetrical to each other, and the configurations are substantially the same. Each console 52 supports the above-mentioned work operation lever 37 and the lock lever 56.

The work operation lever 37 is arranged on the upper part of the console 52 and projects diagonally forward and upward. By operating the work operation lever 37, the operator can give an instruction regarding the operation of the work device 13 or the rotation of the upper swivel body 12.

The lock lever 56 is arranged at the lower part of the front surface of the console 52 and projects diagonally forward and upward. The lock lever 56 is operated to switch the posture of the console 52.

Specifically, the console 52 is rotatably supported around a hinge axis (not shown) arranged at the rear portion. By operating the lock lever 56, the operator switches the console 52 between the normal first posture shown by the solid line in FIG. 1 and the second posture shown by the chain line as shown by the white arrow. Can be done. The first posture is a normal posture when the operator operates the work operation lever 37. The second posture is a posture in which the console 52 is flipped up backward and upward from the first posture, and is used when the operator temporarily retracts the console 52 backward and upward when getting on and off the turning work vehicle 1.

The hydraulic circuit included in the turning work platform 1 is provided with a lock function that invalidates the operation of the work operation lever 37 when the console 52 is in the second posture. As a result, even if the operator's hand or the like accidentally hits the work operation lever 37 of the console 52 in the second posture, it is possible to prevent an unexpected operation corresponding to the accidental operation. This lock function, for example, cuts off the supply of hydraulic oil to the remote control valve (not shown) that opens and closes in response to the operation of the work operation lever 37 when the second posture of the console 52 is detected by a sensor or the like. It can be realized by controlling.

Next, with reference mainly to FIG. 3, two handles used for opening and closing the bonnet 38 will be described. FIG. 3 is a perspective view of the unlocking handle 71 and the belt 72 of the first embodiment as viewed from the front side.

The bonnet 38 is provided with a lock mechanism 80 that can hold the bonnet 38 in a closed state. The lock mechanism 80 includes an unlock handle (first handle) 71 arranged at the lower part of the front surface of the bonnet 38.

In addition to the unlocking handle 71 described above, the lock mechanism 80 includes a support boss 85, a hook plate 86, and a torsion coil spring 87. In the description of the lock mechanism 80, left and right mean left and right when viewed from the operator sitting in the driver's seat.

The support boss 85 is a cylindrical member and is fixed to the inner wall of the bonnet 38 via a bracket 88. The shaft hole of the support boss 85 is oriented substantially in the front-rear direction, and the base portion of the lock release handle 71 bent in an L shape is rotatably supported in the shaft hole.

The unlock handle 71 projects forward from the support boss 85, passes through a through hole of the figure formed in the bonnet 38, and then bends approximately 90 ° to the left. A grip portion for operation is fixed to the tip of this bent portion.

The hook plate 86 is a plate-shaped member, and is fixed to the end of the unlock handle 71 inside the bonnet 38. Therefore, the hook plate 86 rotates integrally with the unlock handle 71.

In the hook plate 86, a hook groove 86a is formed at a position below the center of rotation thereof. The hook groove 86a is formed as an elongated groove in the left-right direction, and the right end portion is open. An elongated lock rod 89 is fixed to an appropriate member on the swivel frame 31 side. The lock rod 89 extends substantially upward from the swivel frame 31, and its end is bent like a hook. The tip of the lock rod 89 can be inserted into the hook groove 86a.

Below the hook groove 86a, the hook plate 86 is formed with an inclined guide portion 86b. The inclined guide portion 86b can rotate the hook plate 86 by being pushed by the tip of the lock rod 89.

The torsion coil spring 87 is arranged so as to connect the bracket 88 and the hook plate 86. The torsion coil spring 87 functions as a urging member, and exerts a spring force on the hook plate 86 in the clockwise direction in the front view, in other words, in the direction in which the hook groove 86a meshes with the tip of the lock rod 89.

In this configuration, when the operator closes the bonnet 38, the hook groove 86a of the hook plate 86 meshes with the lock rod 89 due to the urging force of the torsion coil spring 87. As a result, the lock state is set, and even if the operator holds the belt 72, which will be described later, and tries to pull it up, the bonnet 38 does not open.

When the operator holds the unlock handle 71 and pulls it upward and rotates it around the support boss 85, the hook plate 86 rotates counterclockwise against the urging force of the torsion coil spring 87, so that it is pulled. The engagement between the hook groove 86a and the lock rod 89 is released. As a result, the lock is released and the bonnet 38 can be opened.

The rotational stroke of the unlock handle 71 is limited by the appropriate portion of the hook plate 86 hitting the bracket 88. Therefore, after the operator pulls up the unlock handle 71 to the upper limit, the pulling force applied by the operator to the unlock handle 71 acts to rotate the bonnet 38 itself in the opening direction. In other words, the unlock handle 71 also functions as a handle that the operator grips to pull up and rotate the bonnet 38. Therefore, the unlocking and opening operations of the bonnet 38 can be performed with one action.

When closing the bonnet 38 in the open state, just before the bonnet 38 is completely closed, the tip of the lock rod 89 hits the inclined guide portion 86b, and the hook plate 86 rotates against the urging force of the torsion coil spring 87. do. When the bonnet 38 is completely closed, the lock rod 89 enters the hook groove 86a and automatically returns to the above locked state.

Next, the belt (second handle) 72 arranged immediately below the front part of the driver's seat will be described.

As shown in FIG. 3, the driver's seat 39 is attached above the bonnet 38 by using the front support member 61 and the rear support member 62. As a result, a vertical gap is formed between the driver's seat 39 and the upper surface of the bonnet 38.

The front support member 61 is formed by bending a metal plate, and is formed in a wide substantially U shape when viewed from the front. The central bottom plate portion is fixed to the front portion and the left and right center portions of the upper surface of the bonnet 38 by using a pair of left and right bolts (fixing members) 63. A substantially inverted U-shaped bracket 64 fixed to the lower surface of the driver's seat 39 can be fixed to the left and right side plates via the fulcrum shaft 65.

The rear support member 62 has a columnar anti-vibration rubber, and is fixed to the rear portion of the upper surface of the bonnet 38 in a pair on the left and right. The lower surface of the driver's seat 39 can be attached to the upper end of each rear support member 62.

The belt 72 is configured as an elongated strip, and buckle portions for fixing to the bonnet 38 are fixed to both ends of the belt 72. The buckle portion is made of, for example, metal or synthetic resin, and is fixed to the bonnet 38 together with the front support member 61 by the bolt 63 described above.

The longitudinal intermediate portion of the belt 72 is made of, for example, polyester fiber and has flexibility. Since the length of the belt 72 is longer than the distance between the attachment points (that is, the bolts 63) at both ends thereof, the belt 72 has a slight slack. Therefore, the intermediate portion of the belt 72 can be arranged so as to hang down from the front end of the driver's seat 39 while projecting slightly forward. Since the belt 72 is easily deformed, even if the belt 72 touches the operator getting on and off the turning work vehicle 1, it does not easily get in the way. However, by pushing the belt 72 backward below the driver's seat 39, it can be stored in the space between the bonnet 38 and the driver's seat 39.

Next, a configuration for holding the bonnet 38 in an open state will be described with reference to FIG. FIG. 4 is a schematic side view illustrating the function of the bonnet stay 48.

As shown in FIG. 4, the stay support member 46 is fixed inside the space covered by the bonnet 38 in the upper swing body 12. The stay support member 46 is formed in a plate shape, and is arranged so that the thickness direction thereof is directed to the left-right direction.

On the other hand, the guide member 47 is fixed at an appropriate position on the inner wall of the bonnet 38. The guide member 47 is formed with a guide groove 47a elongated in the front-rear direction. One end of the guide groove 47a is bent short.

One end of the rod-shaped bonnet stay 48 is rotatably supported on the rear upper portion of the stay support member 46. The other end of the bonnet stay 48 is inserted into the guide groove 47a formed in the guide member 47 and can slide along the guide groove 47a.

In this configuration, when the operator tries to open the bonnet 38, as a preliminary preparation, the lock lever 56 is operated for the left and right consoles 52 shown in FIG. 2 and the like, and both of the two consoles 52 are flipped up backward. Two postures. As a result, as described above, the operation of the work operation lever 37 is invalidated.

Subsequently, the operator holds the unlock handle 71 with one hand and pulls up with both hands while holding the belt 72 with the other hand. Since the belt 72 is deformable, not only a person with a large hand but also a person with a small hand can firmly hold and hold it. The lock mechanism 80 is unlocked by applying an upward operating force to the unlock handle 71, and then the bonnet 38 rotates rearward and upward around the rotation shaft 45c. Since the force is applied to the bonnet 38 at two points, the unlock handle 71 and the belt 72, the force of both arms can be applied stably, and the urging device (auxiliary device) such as the torsion bar can be used. The rotation of the bonnet 38 is smooth even without it.

As the bonnet 38 rotates, the bonnet stay 48 rotates and its tip moves along the guide groove 47a. When the bonnet 38 is rotated to a predetermined angle, the tip of the bonnet stay 48 enters the bent portion of the guide groove 47a as shown by the chain line in FIG. 4, and the bonnet stay 48 causes the bonnet 38 to fall backward. Can be pulled and held. In this state, for example, even if a force for rotating the bonnet 38 forward is accidentally applied during maintenance work, the tip of the bonnet stay 48 enters the short groove connected to the bent portion of the guide groove 47a. The bonnet stay 48 is stretched at the end, and the bonnet 38 is prevented from being closed unexpectedly.

To close the bonnet 38 from the open state as shown by the chain line in FIG. 4, pull the bonnet stay 48 slightly upward by hand so that the tip of the bonnet stay 48 comes out of the short groove in the guide groove 47a, and then unlock. The bonnet 38 may be rotated in the opposite direction to the above by holding the handle 71 and the belt 72.

As described above, in the present embodiment, since the bonnet 38 is provided with two places to be touched, it is easy to open and close the bonnet 38 with both hands. Therefore, for example, in a small turning work vehicle, even if it is difficult to provide a torsion bar or the like inside the bonnet 38 due to space limitations, it is possible to improve maintainability by configuring it as in the present embodiment. ..

As described above, the turning work vehicle 1 of the present embodiment includes a bonnet 38, an unlocking handle 71, and a belt 72. The bonnet 38 is rotatably supported around a rotation shaft 45c located behind the engine 33, covers the engine 33, and can be opened and closed. The unlock handle 71 is arranged in front of the bonnet 38. The belt 72 is arranged on the bonnet 38 at a position higher than the unlock handle 71.

As a result, the unlock handle 71 and the belt 72 can be grasped with one hand each, and the bonnet 38 can be opened and closed with both hands. Therefore, the opening and closing work of the bonnet 38 can be easily and smoothly performed. Therefore, for example, even when the torsion bar or the like that urges the bonnet 38 in the opening direction is omitted, the maintainability of the engine 33 or the like can be improved.

Further, the turning work vehicle 1 of the present embodiment includes a driver's seat 39 attached to the upper surface of the bonnet 38. At least a part of the belt 72 can be stored in the space formed between the bonnet 38 and the driver's seat 39.

As a result, the belt 72 can be stored in a place that does not get in the way when it is not necessary to touch the belt 72.

Further, in the turning work vehicle 1 of the present embodiment, the belt 72 is an elongated strip-shaped body having flexibility. Both ends of the belt 72 in the longitudinal direction are attached to the bonnet 38, and the intermediate portion can be stored in the space formed between the bonnet 38 and the driver's seat 39.

This makes it possible to realize a simple and inexpensive configuration in which the belt 72 can be stored.

Next, the second embodiment will be described. FIG. 5 is a perspective view showing the retractable handle 72x of the second embodiment in detail. In the description of the present embodiment, the same reference numerals may be given to the drawings for the same or similar members as those in the above-described embodiment, and the description may be omitted.

The second embodiment differs from the first embodiment in that the bonnet 38 is provided with a retractable handle 72x instead of the belt 72 described above. In addition, in FIG. 5, in order to show the retractable steering wheel 72x and the like in an easy-to-understand manner, a state in which an appropriate member such as the console 52 around the driver's seat 39 is removed from the bonnet 38 is drawn.

The retractable handle 72x is attached to the upper surface of the bonnet 38 via the slide mechanism 90. The slide mechanism 90 includes a guide bracket 95, a pair of sliders 96, and two guide pins 97.

The guide bracket 95 is formed as an elongated member having an inverted U-shaped cross section, and is fixed to the front portion and the left and right center portions of the upper surface of the bonnet 38 with its longitudinal direction facing the front-rear direction. Penetrating guide grooves 95a having the same shape on the left and right are formed on the side walls on both the left and right sides of the guide bracket 95. Each guide groove 95a is formed in a laterally E-shaped shape, and the guide groove 95a is formed with three short holding grooves extending downward at equal intervals. The holding grooves are arranged at the front end, the rear end, and the center of the guide groove 95a.

The sliders 96 are provided as a pair so as to sandwich the guide bracket 95 in the left-right direction. Each slider 96 is formed elongated in the front-rear direction, and its front end portions are fixed to both ends of a retractable handle 72x formed in a substantially C shape in a plan view.

The two guide pins 97 are both thin round bar-shaped members. Each guide pin 97 is arranged so that the pair of sliders 96 are connected to each other with their longitudinal directions facing left and right. The guide pin 97 is inserted into a guide groove 95a formed on both side walls of the guide bracket 95, and can move along the guide groove 95a.

The guide pins 97 are arranged at intervals in the front-rear direction and are oriented parallel to each other. The distance between the guide pins 97 is equal to the distance between the three holding grooves formed in the guide groove 95a.

The width of the retractable handle 72x is formed to be smaller than the distance between the side plates of the front support member 61 described above. Further, the retractable handle 72x is arranged so that its front end portion protrudes toward the front side of the guide bracket 95.

In this configuration, when the retractable handle 72x is slightly lifted, the guide pin 97 attached to the slider 96 comes out of the holding groove of the guide groove 95a, so that the retractable handle 72x can be slid and moved in the front-rear direction. Therefore, it is possible to gradually switch between a usage position in which the front end of the retractable handle 72x protrudes slightly forward from the front end of the driver's seat 39 and a storage position in which almost all of the retractable handle 72x is stored below the driver's seat 39. can. FIG. 5 shows a state in which the two guide pins 97 are inserted into the holding grooves at the front end and the center of the guide groove 95a, and the retractable handle 72x is in the used position. By pushing the retractable handle 72x rearward from this use position, the retractable handle 72x can be set as the above-mentioned retractable position so as not to interfere with the operator getting on and off the turning work vehicle 1.

As described above, in the present embodiment, the retractable handle 72x is slidable and can be stored in the space formed between the bonnet 38 and the driver's seat 39 by moving to one side. It is possible.

As a result, the retractable handle 72x can be stored as needed by a simple operation of sliding the retractable handle 72x.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

In the above embodiment, the belt 72 and the retractable handle 72x are configured to project forward so that the hand can be hung from the front of the bonnet 38. However, instead of this, the belt 72 or the retractable handle 72x may be attached so as to project from the bonnet 38 to at least one of the left and right sides. However, it is preferable that both of the two handles are arranged on the front side of the bonnet 38 (far from the rotating shaft 45c) because the bonnet 38 can be opened with a light force.

In the above embodiment, as the unlock handle 71, a rod-shaped lever that rotates about an axis in the front-rear direction is used. However, as the unlocking handle, for example, a flap-shaped handle that rotates about an axis in the left-right horizontal direction may be used. Also in this case, it is preferable that the bonnet 38 is unlocked by pulling up the handle.

In the first embodiment, the buckle portion of the belt 72 may be provided with an adjusting mechanism capable of adjusting the length of the belt 72 according to, for example, the size of the operator's hand. Further, for example, a rope may be used instead of the belt 72.

In the first embodiment, a recess portion capable of accommodating the belt 72 pushed backward may be formed on the upper surface of the bonnet 38.

In the second embodiment, the slide mechanism 90 can be changed to a configuration in which the rod is slidably supported by, for example, a cylinder.

The operating member for unlocking the bonnet 38 and the handle for rotating the bonnet 38 may be separate members.

The present invention can be applied not only to turning work vehicles but also to work vehicles having various other configurations and uses.

1 Work vehicle 33 Engine 38 Bonnet 39 Driver's seat 71 Unlock handle (1st handle)
72 belt (second handle)
80 lock mechanism

Claims (5)

An openable bonnet that is rotatably supported around the axis of rotation located behind the engine and covers the engine,
The first handle placed on the front of the bonnet and
A second handle arranged on the bonnet at a position higher than the first handle,
Equipped with
A work vehicle characterized in that the first handle and the second handle are arranged side by side in a direction intersecting the axial direction of the rotation axis of the bonnet. The work vehicle according to claim 1.
With a driver's seat attached to the top of the bonnet
A work vehicle characterized in that at least a part of the second handle can be stored in a space formed between the bonnet and the driver's seat. The work vehicle according to claim 2.
The second handle is an elongated strip having flexibility.
A work vehicle characterized in that both ends in the longitudinal direction of the second handle are attached to the bonnet, and the intermediate portion can be stored in the space. The work vehicle according to claim 2.
The second handle is a work vehicle that can be slidably moved and can be stored in the space by moving to one side. The work vehicle according to any one of claims 1 to 4.
It is equipped with a lock mechanism that can be locked with the bonnet closed and can be unlocked by operating the first handle.
The lock mechanism is a work vehicle characterized in that the lock is released by an operating force for operating the first handle in a direction of opening the bonnet.

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