JP2002002561A - Crawler excavating vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler excavating vehicle capable of traveling at a high speed. SOLUTION: This crawler excavating vehicle is formed so that the rear end of a superstructure mounted on a carrier having a crawler traveling device is swung within the longitudinal length and width of the crawler traveling device. An idler 23 and a sprocket 24 are installed on a truck frame 22, apart upward from the ground, at the position on the outside of the turning radius track of the rear end of the upper structure 2 crossing over right and left truck frame gauges N1. Lower rolling rings 25 and 26 positioned close to the idler 23 and sprocket 24 apart upward from the ground are formed in fixed type lower rolling rings, and the fixed type lower rolling rings are installed on the truck frame 22 at the position on the outside of the turning track of the rear end of the upper structure crossing over the right and left truck frame gauges N1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type excavating vehicle capable of running at high speed.

[0002]

2. Description of the Related Art Conventionally, excavating vehicles such as hydraulic shovels often work on uneven terrain such as construction sites and quarries, so that a crawler-type vehicle that travels with a traveling device having crawler tracks is generally used. I have. A traveling device of a general crawler-type hydraulic excavator has, for example, a configuration as shown in a side view of FIG. In the figure, a hydraulic excavator 1 includes a lower traveling body 6.
0 is equipped with a pair of crawler-type traveling devices 61 on the left and right,
A counterweight 5 is disposed at the rear end of the upper revolving unit 2 which is mounted on the upper part of the lower traveling unit 60 so as to be pivotable at a substantially central upper portion thereof. 7
(Having a boom, an arm, a bucket, etc., only the boom is shown here). Traveling device 61
Has a track frame 62 in the longitudinal direction, an idler 63 is attached to the front end of the track frame 62, and a sprocket 64 is attached to the rear end thereof in a freely rotatable manner.
A plurality of lower rollers 65 are rotatably arranged on the lower surface at predetermined intervals in the longitudinal direction, and a crawler belt 69 is wound therearound. In the traveling device 61, the idler 63
The sprocket 64 has a lift-off angle (not shown) which is normally set to a small angle of about 0 to 2 degrees, and is practically substantially in contact with the ground. The distance between the idler 63 and the sprocket 64) is ensured to maximize stability during excavation work and running.

[0003]

2. Description of the Related Art In urban civil engineering work which has been increasing in recent years, there are many opportunities to use a hydraulic shovel for general purposes not only for excavation but also for other accompanying works. For example, when a truck or the like cannot enter a narrow excavation site, the excavated earth and sand or rubble is transported to a predetermined wide place slightly away from the excavation site and temporarily accumulated there, and finally the trucks and the like are collectively collected. Work processes such as loading on a truck must be performed by a hydraulic excavator. Alternatively, in landscaping work, it is also required to carry garden trees from roads to predetermined positions in the garden and plant them. In such a case, it is necessary to run at a high speed in order to increase the transport work efficiency. However, the following problems occur in the hydraulic excavator using the conventional traveling device 61 as described above. (1) Since the separation and elevation angles of the idler 63 and the sprocket 64 are small, the vehicle travels at a high speed, and unevenness or obstacles (rocks, etc.) on the ground.
The impact of the collision when riding over is very large,
It is difficult to drive at high speed, the riding comfort is poor, and the durability of the vehicle is reduced. (2) Further, since the separation angle is small as described above, it is difficult to get over the step. For this reason, many incidental works such as putting sleepers etc. on steps, filling slopes with soil and making slopes and removing the soil at the end of construction and cleaning, etc. occur, resulting in reduced work efficiency and construction cost reduction. Has led to a rise. In view of the above, there is a strong demand for a general-purpose crawler-type excavation vehicle that satisfies not only excavation performance but also traveling performance, particularly high-speed traveling performance, thereby improving work efficiency and reducing construction costs.

[0004] The present invention has been made in view of the above problems, and has as its object to provide a crawler-type excavating vehicle capable of running at high speed.

[0005]

Means for Solving the Problems, Functions and Effects In order to achieve the above object, a first aspect of the present invention is to provide an upper revolving structure which is rotatably mounted on a lower traveling structure having a crawler type traveling device in a lower part. In a crawler-type excavating vehicle in which the rear end is turned within the longitudinal width of the crawler-type traveling device, the idler and sprocket mounted on the crawler-type excavator are turned at the rear end of the upper revolving structure crossing right and left track frame gauges. It is configured to be mounted at a position outside the locus of the radius and separated from the ground. According to this configuration, since the idler and the sprocket of the crawler-type traveling device are mounted on the truck frame at a predetermined angle or more from the ground, the impact when the vehicle climbs over a step or an obstacle (rock, etc.) is reduced. Therefore, high-speed running is possible, and work efficiency can be improved, and riding comfort and vehicle durability can be improved. In addition, since it is troublesome and unnecessary to perform extra work as in the related art for smoothly overcoming a step or the like, workability and construction cost can be improved. Further, the idler and the sprocket are separated from the ground at four front, rear, right and left positions surrounding the turning projection area of the upper turning body (that is, the turning area in plan view) outside the turning locus of the rear end of the upper turning body. As a result, the upper rotating body can be stably supported even as a traveling device in which the idler and the sprocket are lifted off the ground. Therefore, stability during turning and excavation of the upper-part turning body can be ensured, and high-speed traveling can be achieved.

According to a second aspect of the present invention, a rear end of an upper revolving structure rotatably mounted on a lower traveling body having a crawler-type traveling device at a lower portion pivots within the longitudinal width of the crawler-type traveling device. In the crawler-type excavating vehicle, the idler attached to the track frame of the crawler-type traveling device is lifted off the ground at a position outside the trajectory of the turning radius of the rear end of the upper revolving structure crossing the right and left track frame gauges. The sprocket is attached to the ground substantially at a position outside the locus of the turning radius at the rear end of the upper turning body crossing the right and left track frame gauges and is attached to the ground. According to this configuration, the idler is attached to the truck frame at a predetermined angle or more while being lifted off the ground, so that steps or obstacles (such as rocks) can be removed.
The impact when overcoming is reduced. Therefore, high-speed running is possible, and work efficiency can be improved, and riding comfort and vehicle durability can be improved. This also improves workability and construction costs as described above. Further, the idler and the sprocket are separated from the ground at four positions in front, back, left and right surrounding the turning projection area of the upper turning body, respectively, outside the turning trajectory of the rear end of the upper turning body, and substantially contact with the ground. Therefore, even when the idler is lifted off the ground, the upper revolving superstructure can be stably supported. Therefore, stability during turning and excavation of the upper-part turning body can be ensured, and high-speed traveling can be achieved.

A third invention is based on the first or second invention, wherein the lower rolling wheel adjacent to the idler and the sprocket lifted off the ground is a fixed lower rolling wheel, and the fixed lower rolling wheel is ,
It is configured to be attached to the track frame at a position outside the locus of the turning radius at the rear end of the upper revolving structure crossing the left and right track frame gauges. According to this configuration, since the outermost lower rolling wheels respectively adjacent to the idler and the sprocket lifted off the ground are fixed lower rolling wheels (attached to the bracket fixed to the track frame),
The ground contact length of the crawler belt is ensured, and the fluctuation of the ground contact length is reduced even if the ground is uneven. Therefore, stability during running and excavation of the vehicle body can be secured. Further, since the crawler belt is constantly pressed against the ground by the outermost fixed type lower wheel, the crawler belt can be guided by the lower wheel without fail in the middle. At this time, the fixed lower rolling wheel is attached to the track frame at a position outside the turning locus of the rear end of the upper revolving structure crossing the left and right track frame gauges, so that the upper revolving structure can be turned and excavated at the time of excavation. Stability can be ensured.

According to a fourth aspect based on the third aspect, the lower rolling wheels other than the fixed lower rolling wheels are bogie type lower rolling wheels which are swingably attached to the track frame. I have. According to this configuration, since the inner lower rolling wheel is of a bogie type, it is possible to alleviate the shaking of the vehicle body due to the unevenness of the ground surface even at high speed traveling, so that it is possible to improve the riding comfort and to reduce the rubble and other conveyed objects from the bucket. Load spillage can be prevented. This facilitates the transfer operation and allows efficient transfer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, taking a crawler type excavator as a crawler type excavator.

First, a first embodiment will be described with reference to FIGS. 1 and 2 are a plan view and a side view, respectively, of the crawler-type hydraulic excavator of the present embodiment.

Referring to FIGS. 1 and 2, an upper revolving unit 2 is rotatably mounted substantially at the center of the upper portion of a lower traveling unit 20.
A counterweight 5 is attached to the rear end of the upper revolving unit 2 and a work machine 7 having a bucket 14 at the front end is swingably attached to substantially the left and right centers of the front part. On the left and right sides of the lower traveling body 20, a pair of traveling devices 21 and 21 having a contact length M1 and separated from each other by a distance of a gauge (a so-called gauge distance) N1.
Are arranged. When the upper revolving unit 2 is oriented in the front-rear direction of the vehicle, the rear end of the counterweight 5 is
1 are located inside the front and rear ends. Also, the contact length M
1 is equal to or larger than the gauge N1.

The traveling device 21 has a boat shape in a side view. That is, a track frame 22 is disposed in the traveling device 21 in a longitudinal direction, and an idler 23 is provided at a front end of the track frame 22 and a sprocket 24 is provided at a rear end of the track frame 22 so as to be rotatable from the ground. Is being worn.
At this time, the lift angles α and β of the idler 23 and the sprocket 24 are such that the hydraulic excavator can smoothly move over the undulation of the predetermined size without receiving a shock in the front-rear direction when traveling on the undulation portion at the predetermined high speed. The angle is set to an angle (10 to 40 degrees, preferably 20 to 30 degrees) that is equal to or greater than a predetermined angle.

The lower rolling wheels 25 and 26 which are closest to the idler 23 and the sprocket 24 respectively have brackets 2 fixedly provided on the lower surface of the track frame 22.
8, 29 are rotatably attached. The lower rollers 25 and 26 are connected to a gauge N1 as shown in FIG.
And a turning locus C at the rear end of the upper rotating body. As a result, the idler 23 and the sprocket 24 are lifted off the ground at the mounting positions of the lower rolling wheels 25 and 26, that is, at positions outside the turning trajectory C at the rear end of the upper turning body. In addition, a predetermined number (here, 2) is provided on the lower surface of the track frame 22 between the lower rollers 25, 26.
) Swing brackets 31 are provided so as to be able to swing back and forth, and two lower rolling wheels 27 and 27 are attached to the front and rear ends of each swing bracket 31 so as to be swingable in tandem. A crawler belt 39 is wound around the idler 23, the sprocket 24, the lower rollers 25, 26, and the lower rollers 27, 27.

According to this embodiment, the following operations and effects can be obtained. (1) The separation and elevation angle α of the idler 23 and the sprocket 24,
Since β is set within an appropriate range equal to or larger than the predetermined angle, the impact in the front-rear direction is reduced when the vehicle travels over high-speed traveling over rough terrain, rocks, steps, and the like, so that the vehicle can smoothly travel over.
Therefore, high-speed running (for example, about 10 km / h) is possible, so that work efficiency can be improved, and riding comfort and vehicle durability can be improved. In addition, as described in the description of the related art, it is troublesome to form a gentle slope by filling soil and the like into the undulations and steps, so that no extra work is required, so that workability and construction cost can be improved. (2) Because the lower rolling wheels 25 and 26 closest to the idler 23 and the sprocket 24 are arranged outside the intersection of the turning trajectory C of the rear end of the counterweight 5 and the width line of the gauge N1 in the front-rear direction. , The idler 23 and the sprocket 24 are lifted from the ground at four positions, that is, front, rear, left and right so as to surround the swivel projection area (swirl area in plan view) of the upper swing body 2. Therefore, even when the idler 23 and the sprocket 24 are lifted and lowered, the traveling device can stably support the upper revolving superstructure 2, thereby enabling high-speed traveling and securing the stability of the upper revolving superstructure 2 during turning and excavation. it can. Also,
By setting the contact length M1 to be equal to or greater than the gauge (gauge distance) N1, the excavation stability in the front-rear direction of the hydraulic shovel can be further secured.

(3) The lower rolling wheel 27 at the center of the traveling device 21
Is provided so as to be swingable, so that the lower rolling wheel 27 can be
Absorbs the difference in height of the undulations on the ground surface, so that the shovel of the hydraulic shovel due to the undulations can be reduced even at high speeds. Therefore, the riding comfort can be improved, and the load can be prevented from being spilled when the rubble or the like is put into the bucket 14 and transported. (4) Since the outermost lower rolling wheels 25 and 26 closest to the idler 23 and the sprocket 24, respectively, are attached to the fixed brackets 28 and 29, the ground contact length M1 of the crawler belt 39 is ensured, and the ground track M1 is secured. Contact length M even if there is undulation
1 is reduced, and the stability of the vehicle body during running and excavation can be secured. Further, since the crawler belt 39 is constantly pressed against the ground by the front and rear lower wheels 25, 26, the crawler belt 39 is intermediately provided.
The crawler belt 39 can be reliably guided by the lower rolling wheels 25, 26, 27 without slackening. (5) Since the diameters of the idler 23 and the sprocket 24 are reduced and the horizontal distance between the lower rollers 25 and 26 adjacent to the idler 23 and the sprocket 24 are shortened, the overall length L3 of the traveling device 21 is suppressed and the device is compact. it can. As a result, a crawler-type hydraulic shovel that can maintain the compactness and excavation stability of the traveling device and can easily perform the transfer operation can be realized.

Next, a second embodiment will be described with reference to FIGS. 3 and 4 are a plan view and a side view, respectively, of the crawler belt type hydraulic shovel according to the present embodiment. In addition,
The same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.

In FIGS. 3 and 4, the upper swing body 2 is swingably mounted substantially at the center of the upper part of the lower running body 40, and the right and left sides of the lower running body 40 are separated from each other by a distance of a gauge N1. A pair of traveling devices 41, 41 having M1 are provided. When the upper revolving unit 2 is oriented in the vehicle longitudinal direction, the rear end of the counterweight 5 is
Are located inside the front and rear ends. Also, the contact length M1
Is equal to or larger than the gauge N1.

The difference between the traveling device 41 of the present embodiment and the preceding embodiment is that the sprocket 64 at the rear end of the track frame 22 has a small elevation angle so that the sprocket 64 is substantially in contact with the ground. It is the same as the previous embodiment except that it is located outside the intersection of the trajectory C and the width line of the gauge N1 in the front-rear direction and does not have the fixed lower rolling wheel 26 close to the sprocket 64.

According to the present embodiment, the following operations and effects can be obtained. (1) By providing a relatively large elevation angle α that is equal to or more than a predetermined value only on the idler 23 side, it is possible to alleviate the impact when traveling at high speed to the idler 23 side and over obstacles on the ground. Therefore, as in the previous embodiment, the transport operation can be performed at a high speed and the work efficiency can be improved, and the riding comfort and vehicle durability can be improved. In addition, since troublesome and unnecessary work as in the related art is not required, workability and construction cost can be improved. (2) The lower wheels 25 and 26 closest to the idler 23 and the ground contact position of the sprocket 24 are disposed outside in the front-rear direction of the intersection of the turning locus C of the rear end of the counterweight 5 and the width line of the gauge N1. Therefore, the position where the idler 23 is lifted off the ground and the position where the sprocket 24 touches the ground are four positions in front, rear, left and right surrounding the swivel projection area of the upper swing body 2. Therefore, even if the idler 23 is lifted and removed, the traveling device can stably support the upper revolving unit 2, so that high-speed traveling is possible, and the stability of the upper revolving unit 2 during turning and excavation can be secured. . (3) Since the lower rolling wheel at the center of the crawler belt can swing freely,
It is possible to prevent the vehicle from shaking during high-speed running in the ups and downs, and to improve riding comfort. In the present embodiment, only the idler-side lift-off angle is set relatively large, but if only the sprocket-side lift-off angle is set relatively large (not shown), the operation and effect are the same. It is.

As described above, according to the crawler-type excavating vehicle of the present invention, at least one of the separation and elevation angles of the crawler on the idler side and the sprocket side is set within an appropriate range of a predetermined value or more, so that the crawler can get over the undulating portion. The impact at the time is reduced, high-speed running is possible, and the durability of the vehicle can be improved. In addition, since the lifting position on the idler side and sprocket side is outside the rotation projection area of the upper rotating body, even if the idler or sprocket is lifted up and down, the contact length of the traveling device is secured and the upper rotating body is stably supported. can do. Further, since the lower rolling wheel is provided so as to be swingable, the swing of the vehicle can be reduced, and the collapse of the load during the transfer operation can be reduced. This makes it possible to add a transport function to crawler-type excavators, such as crawler-type hydraulic excavators, which are widely used in urban-type small-scale construction due to their compactness. it can.

[Brief description of the drawings]

FIG. 1 is a plan view of a crawler-type hydraulic excavator according to a first embodiment.

FIG. 2 is a side view of the crawler belt type excavator according to the first embodiment.

FIG. 3 is a plan view of a crawler-type hydraulic excavator according to a second embodiment.

FIG. 4 is a side view of a crawler-type hydraulic excavator according to a second embodiment.

FIG. 5 is a side view of a crawler type hydraulic excavator according to the related art.

[Explanation of symbols]

2 ... upper revolving structure, 5 ... counterweight, 7 ... work machine,
Reference numeral 20: lower traveling body, 21: traveling device, 22: truck frame, 23: idler, 24: sprocket, 28,
29: Bracket, 25, 26, 27 ... Lower wheel, 31 ...
Rocking bracket, 39: track, 40: undercarriage, 41
... travel device, 60 ... lower traveling body, 61 ... travel device, 63
... idler, 64 ... sprocket, 65 ... lower wheel, M,
M1: contact length, N1: gauge (distance between gauges), α, β: lift-off angle, C: turning trajectory of the rear end of the upper turning body.

Claims (4)

[Claims] 1. A crawler type in which a rear end of an upper revolving structure rotatably mounted on a lower traveling body having a crawler type traveling device at a lower portion pivots within a longitudinal width of the crawler type traveling device. In an excavator, the idler (23) and sprocket (24) attached to the track frame (22) of the track-type traveling device are connected to the upper revolving superstructure (2) that crosses the right and left track frame gauges (N1). A crawler-type excavating vehicle, which is mounted at a position outside of the locus of the ground and separated from the ground. 2. A crawler type in which a rear end of an upper revolving structure rotatably mounted on a lower traveling body having a crawler type traveling device at a lower portion pivots within a longitudinal width of the crawler type traveling device. In the excavation vehicle, the idler (23) attached to the track frame (22) of the crawler-type traveling device is located outside the trajectory of the turning radius at the rear end of the upper revolving superstructure (2) that crosses the left and right track frame gauges (N1). At the position shown above, lift it off the ground and attach it.
A crawler type excavating vehicle characterized in that it is mounted substantially on the ground at a position outside the locus of the turning radius at the rear end of the upper revolving superstructure (2) crossing over the left and right track frame gauges (N1). 3. The crawler-type excavating vehicle according to claim 1, wherein the lower rollers (25, 26) approaching the idler (23) and the sprocket (24) lifted off the ground are fixed lower rollers. The fixed lower wheel is attached to the track frame (22) at a position outside the trajectory of the turning radius at the rear end of the upper revolving structure (2) crossing the left and right track frame gauges (N1). Crawler type excavation vehicle that features. 4. The track-type excavating vehicle according to claim 3, wherein a bogie type lower wheel is swingably attached to the track frame (22) except for the fixed type lower wheel. A crawler-type excavation vehicle characterized by the following.