JP2942051B2 - Crawler type traveling body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type traveling body of construction equipment such as a crane and a hydraulic shovel, and more particularly to a truck having side frames provided on both sides of a truck frame so as to be movable in the width direction. .

[0002]

2. Description of the Related Art FIG. 6 is an overall structural view showing an example of this type of crawler type traveling body, and FIG. 7 is a sectional view taken along line VII-VII of FIG. In the figure, a swing bearing 2 is fixed to a center portion of a track frame 1, and an upper swing body (not shown) is swingably supported on an upper portion thereof. A pair of connecting portions 1a are formed on both sides of the track frame 1 so as to project outward, and a pair of left and right side frames 3 are connected to the connecting portions 1a. Driving wheels and idler wheels, which are rotationally driven by a hydraulic drive device (not shown), are provided on the front and rear portions of each side frame 3, respectively, and on the lower surface side of the side frame 3, as shown in FIG. A plurality of lower rollers 4 having a flange 4a and an outer flange 4b are rotatably supported between the driving wheels and the idler wheels. In addition, a track shoe 6 is used for driving wheels and idle wheels.
The track shoe 6 is driven by the rotation of the driving wheels while being guided by the lower roller 4 and an upper roller (not shown) provided on the upper surface side of the side frame 3.

The side frame 3 is also formed with a pair of front and rear fitting holes 3a opening in the width direction, and the respective connecting portions 1a of the track frame 1 are slidably inserted into the respective fitting holes 3a. You. Here, the height A of the connecting portion 1a of the track frame 1 and the fitting hole 3a of the side frame 3 are set.
Height dimension B satisfies A <B as shown in FIG. Reference numeral 7 in FIG. 6 denotes a hydraulic cylinder provided between the left and right side frames 3. The rod side of the hydraulic cylinder 7 is connected to the left side frame 3, and the bottom side is connected to the right side frame 3. I have. Therefore, by the expansion and contraction of the hydraulic cylinder 7, each side frame 3 is guided by the connecting portion 1 a and is transported with respect to the truck frame 1 at the working position (vehicle width enlarged position) shown by the solid line in the drawing and the two-dot chain line. It is possible to move between the hour position (vehicle width reduction position).

At the time of work, the side frame 3 is widened to a work position indicated by a solid line so that the vehicle width is set to a work width indicated by W2, thereby stabilizing the vehicle. The vehicle width is reduced to a transportation position indicated by a chain line to be a transportation width represented by W1 (<W2), thereby facilitating transportation. L in FIG. 7 is the distance between the overturning fulcrums, which is generally the distance between the outer flanges 4b of the right and left lower rollers 4. Reference numeral 5 denotes four fixed links disposed between the inside of the side frame 3 and the track frame 1. Each fixed link 5 is guided inside or outside the side frame 3 by guiding its guide hole to a guide pin. To prevent the side frame 3 from coming off when the transport width W1 or the work width W2 is reached.

By the way, in the crawler type traveling body constructed as described above, the fitting hole 3a is loosely fitted to the connecting portion 1a so that the side frame 3 can move smoothly with respect to the track frame 1. Therefore, when the side frame 3 is expanded to the working position, the load applied to the track frame 1 causes the side frame 3 to rotate clockwise around the inner flange 4a of the lower roller 4. Receive strength. Therefore, the outer flange 4b of the lower roller 4 is connected to the track shoe 6 as shown in FIG.
The load applied to the track frame 1 not only causes a large surface pressure to be applied to the inner flange 4a of the lower roller 4 but also causes the distance L between the falling supports to decrease.
There is a problem that the distance between the inner flanges 4a of the rubber 4 is reduced to L '.

In order to solve this problem, the present applicant has previously proposed a crawler traveling body as disclosed in Japanese Utility Model Publication No. 1-21909. As shown in FIGS. 8 to 10, the lower surface of the fitting hole 11a of the side frame 11 is shorter than the upper surface, and the upper surface of the connecting portion 1a of the track frame 1 and the taper formed on the upper surface of the fitting hole 11a. A wedge-shaped shim 12 is inserted between the shim 12 and the surface 11b, and the shim 12 is fixed with a bolt 13 as shown in FIGS. According to this, when the side frame 11 is moved to the working position, the peripheral surfaces of both the flanges 4a and 4b of the lower roller 4 abut on the track shoe 6, and
Since a load can be received in a wide range, a phenomenon in which a large load acts only on the inner flange 4a can be prevented, and the distance between overturning fulcrums can be maintained at L. When the side frame 11 is driven to the transport position, the wedge-shaped shim 12 is removed.

[0007]

However, when such a wedge-shaped shim 12 is used, the following problems occur. (1) Each time the side frame 11 is moved, it is necessary to attach and detach the wedge-shaped shim 12 with the bolt 13, which is troublesome. (2) The wedge-shaped shim 12 is removed during transportation. Conventionally, the removed wedge-shaped shim 12 is fixed to another portion of the crawler traveling body with a bolt 13 in order to prevent loss. The work takes time. (3) When the construction machine starts and stops, a large force acts on the wedge-shaped shim 12 so that the bolt 13 is easily loosened. In other words, the track frame 1 and the side frame 3 have a limited production accuracy due to the welded structure.
As shown in (1), gaps d1 and d2 always occur between the fitting hole 3a and the connecting portion 1a. For this reason, at the time of starting, the side frame 3 having the traveling drive device starts before the track frame 1 by the gap, and thereafter, the fitting hole 3a
The track frame 1 starts to move integrally with the side frame 3 only when the wall surface of the track frame 1 contacts the side surface of the connecting portion 1a. Conversely, at the time of stop, even after the side frame 3 stops, the track frame 1 moves by the above gap, and the side surface of the connecting portion 1a comes into contact with the wall surface of the fitting hole 3a and stops. In other words, each time the vehicle starts and stops, the track frame 1 moves back and forth with respect to the side frame 3 by the gap. Since the wedge-shaped shim 12 is provided between the track frame 1 and the side frame 3, for example, when the vehicle starts in the direction D1 in FIG. , A rotational force acts on the wedge-shaped shim 12 in the direction indicated by D2, and when stopped, a rotational force acts in the direction opposite to the B direction. Thus, every time the vehicle starts and stops, the wedge-shaped shim 12
, The bolt 13 is loosened by repetition, and the bolt 13 may come off, causing the wedge-shaped shim 12 to shift or come off. (4) As shown in FIG. 9, the contact surface between the side frame 11 and the wedge-shaped shim 12 is inclined, so that a large contact area cannot be obtained, so that the contact surface is easily set or worn.

An object of the present invention is to receive a load on both flanges of the lower roller when the side frame is moved to the working position side without using another member such as the wedge-shaped shim described above. It is to provide a possible crawler-type traveling body.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 showing an embodiment, according to the present invention, a track frame 20 having connecting portions 21 protruding at both ends, a driving wheel and an idle wheel are rotated. And a pair of right and left pairs of sliding members respectively slidably disposed laterally with respect to the track frame 20 through the fitting holes 31. A side frame 30, a driving means 7 (FIG. 6) for driving these side frames 30 in a substantially horizontal direction between a predetermined vehicle width expanding position and a vehicle width reducing position, and an inner flange 4a and an outer flange 4b. A plurality of lower rollers 4 rotatably supported on the lower surface of the side frame 30 between the drive wheels and the idler wheels, and being hung between the drive wheels and the idler wheels to rotate the drive wheels. To at least a plurality of lower rollers 4 It is a track shoe 6, which is driven while
And is applied to a crawler type traveling body having: According to the first aspect of the present invention, a first contact portion 41 having a substantially horizontal surface is protruded at a predetermined location on the upper surface of the connecting portion 21, and a predetermined upper surface of the fitting hole 31 facing the upper surface of the connecting portion 21 is provided. A second contact portion 31a having a substantially horizontal surface capable of making surface contact with the first contact portion 41 is protruded at a location, and when the side frame 30 is at the vehicle width reduction position, the first contact portion 41a is formed. When the side frame 30 is driven to the vehicle width expanding position, the first and second contact portions 41, 3 are kept in a non-contact state with the second contact portion 31a.
1a, the substantially horizontal surfaces of the side frames 30
Is held so that the peripheral surfaces of both flanges 4a and 4b of the lower roller 4 are both in surface contact with the inner surface of the track shoe 6, thereby solving the above problem. According to the second aspect of the present invention, a bottomed hole HL that is immersed from the upper surface of the connecting portion 21 is provided at a predetermined position of the connecting portion 21, and at least a part of the upper surface has a first contact portion having a substantially horizontal surface. Block 41
Is accommodated in the hole HL so that the first contact portion protrudes from the upper surface of the connecting portion 21, and the first contact portion is provided at a predetermined position on the upper surface of the fitting hole 31 facing the upper surface of the connecting portion 21. A second contact portion 31a having a substantially horizontal surface capable of making surface contact with the first contact portion and projecting from the first contact portion and the second contact portion when the side frame 30 is at the vehicle width reduction position. When the side frame is driven to the vehicle width enlarged position, the substantially horizontal surfaces of the first and second contact portions come into surface contact with each other, and the side frame 30
Is held in such a posture that the peripheral surfaces of both flanges 4 a and 4 b of the lower roller 4 are both in surface contact with the inner surface of the track shoe 6.

[0010]

When the side frame 30 is driven to the above-described vehicle width enlarged position, the lower surface of the second contact portion 31a is brought into contact with the first contact portion 41.
Abuts the top surface of the Thereby, the connecting portion 21 and the fitting hole 3
The first and second contact portions 4 are part of the vertical gap with the first contact portion 4.
Since the side frame 30 is filled with 1, 31a, the side frame 30 does not rotate even if a clockwise rotation force acts on the side frame 30 due to the load applied to the track frame 20. Therefore, the peripheral surfaces of both flanges 4a, 4b of the lower roller 4 are both in surface contact with the inner surface of the track shoe 6, so that the load can be received by both flanges 4a, 4b.

In the means and means for solving the above problems which explain the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 is a sectional view corresponding to FIG. 7 showing a main part of a crawler type traveling body according to the present invention, FIG. 2 is a partially enlarged view thereof, and FIG. 3 is a view along a line III-III in FIG. It is an arrow view. In each of the drawings, the same parts as those in FIGS. 6 and 7 are denoted by the same reference numerals. As described above, the track frame denoted by reference numeral 20 is provided with the swivel bearing 2 (FIG. 6) at the center thereof, and a pair of connecting portions 21 project outward on both sides of the track frame 20. In the upper plate 21a of the connecting portion 21, a substantially rectangular through hole HL is formed at the distal end side. 21b
Is a support plate 21d fixed to the bottom plate 21c of the connecting portion 21.
3 is a block mounting table fixed directly below the through hole HL in the connecting portion 21 through the connecting portion 21. On this mounting table 21b, an octagonal block 41 as shown in FIG. It is placed so as to protrude upward from the hole HL.

The diameter of the block 41 in the front-rear and left-right directions is substantially the same as the diameter of the through-hole HL in the same direction, so that the movement of the block 41 in the front-rear and left-right directions is restricted by the wall surface of the through-hole HL. The block 41 is formed with a slope 41a at one end (specifically, at the base end of the connecting portion 21). The shim 42 is formed by laminating a plurality of sheet-like members, and the number of the members is adjusted by adjusting the number of sheets.
The amount of protrusion from the through hole HL on one upper surface is adjustable.
One end of the shim 42 is bent downward along the one end surface of the mounting table 21b as shown in FIG. 43
Is a stopper for preventing the shim 42 from coming off. The stopper 43 is attached to the lower surface of the upper plate 21a of the connecting portion 21 by bolts 44 with the bent portion 43a in contact with the bent portion of the shim 42. Here, since it is necessary to change the position of the bent portion 43a according to the number of shims 42 to be used, the stopper 4
The third bolt through hole 43b is a long hole.

On the other hand, reference numeral 30 denotes the track frame 20.
And a pair of left and right side frames (only one is shown in the figure) connected to the connecting portion 21 of the inner frame 4a.
A plurality of lower rollers 4 having an outer flange 4b and a plurality of lower rollers 4 are mounted, and drive wheels and idle wheels which are rotationally driven by a hydraulic drive device (not shown) are provided before and after the side frame 30. Also, a track shoe 6 is hung around the driving wheel and the idler wheel.
The rotation of the drive wheels causes the lower roller 4 and the side frame 30 to rotate.
It is driven while being guided by an upper roller (not shown) provided on the upper surface side.

The side frame 30 is also formed with a pair of front and rear fitting holes 31 (only one is shown in the figure) that opens in the width direction. The connecting portion 21 is slidably inserted into the hydraulic cylinder 7 provided between the left and right side frames 30.
6 (FIG. 6), each side frame 30 can be moved between the work position and the transport position so that each side frame 30 is guided by the connecting portion 21.

Further, a projection 31a is provided at one end of the upper surface of the fitting hole 31 at a location corresponding to the block 41, and the length in the vehicle front-rear direction is as shown in FIG. Is approximately equal to the length of This projection 31
a is located away from the block 41 when the side frame 30 is in the transport position as shown in FIG.
The distance d3 between the upper surface of the connecting portion 21 and the upper surface of the block 41 is substantially equal to the amount of protrusion of the upper surface of the block 41 from the through hole HL, that is, the distance d4 between the upper surface of the connecting portion 21 and the upper surface of the block 41.

Next, the operation of the embodiment will be described. FIG. 4 shows a state at the time of transportation, and the vehicle width at this time is a transportation width indicated by W2 in FIG. In starting the operation in this state, first, the hydraulic cylinder 7 is extended to move the pair of left and right side frames 30 outward. At this time,
Since there is a gap between the upper surface of the connecting portion 21 of the track frame 20 and the upper surface of the fitting hole 31 of the side frame 30, and the extending direction of the hydraulic cylinder 7 and the moving direction of the side frame 30 are the same, The sliding resistance between the fitting 21 and the fitting hole 31 is small, and the side frame 30 can be driven smoothly. Therefore, the driving force of the hydraulic cylinder can be relatively small.

When the side frame 30 reaches just before the working position, a clockwise rotational force starts to be generated in the side frame, and at this time, the protrusion 31a of the fitting hole 31
The protrusion 31a presses the block 41 leftward and downward in the figure via the slope 41a. Here, the left side surface of the block 41 is a through hole HL.
The movement of the block 41 to the left is prohibited, and the downward movement of the block 41 is also prohibited by the shim 42. Therefore, the block 41 does not move, and the protrusion 31a is When the side frame 30 moves to the left while sliding on the upper side and reaches the work position, the lower surface of the projection 31a comes into surface contact with the upper surface of the block 41 as shown in FIGS. .

The work is performed in this state. At this time, even if a downward load acts on the track frame 30 and a clockwise rotating force is applied to the side frame 30, the force is applied to the protrusion 31 a and the block 41. The side frame 30 does not rotate in the clockwise direction, and the side frame 30 is held parallel to the track frame 20. Therefore, the lower row
The peripheral surfaces of both flanges 4a and 4b of the roller 4 come into surface contact with the inner surface of the track shoe 6, and the loads can be received by the two flanges 4a and 4b, so that a large load acts only on the inner flange 4a. The distance between the overhanging fulcrums can be increased while preventing the falling. As shown in FIG. 3, since the block 41 and the protrusion 31a are slidable in the front-rear direction of the vehicle, even if the track frame 20 slightly moves in the front-rear direction with respect to the side frame 30 at the time of starting or stopping, no problem occurs. No problem.

When the operation is completed and the hydraulic cylinder 7 is contracted for transportation, the side frame 30 is driven rightward in the figure. At this time, the protrusion 31 of the fitting hole 31
a slides on the block 41, but when the projection 31a reaches the position of the slope 41a, the projection 31a and the block 41a move.
Is in a non-contact state, and thereafter the side frame 30 can be smoothly driven to the transport position.

In the construction of the above embodiment, the hydraulic cylinder 7 constitutes the driving means, the block 41 constitutes the first contact part, and the projection 31a constitutes the second contact part.

In the above description, the through hole HL is provided on the upper surface of the connecting portion 21 of the track frame 20 and the block 41 is projected upward from the through hole HL. For example, as shown in FIG. Even if a step is formed in the connecting portion 21 'and the block 41 is placed between the step and the stopper 21A, the same operation and effect as described above can be obtained. Contrary to the above, while a block is provided via a shim so as to project downward from the upper surface of the fitting hole of the side frame, a projection is provided on the upper surface of the connecting portion of the track frame, and the side frame 30 reaches the working position. When doing so, the block may contact the projection. Further, in the above description, the block is placed via the shim formed by laminating the sheet-like members. However, if the protrusion can be brought into close contact with the block when the side frame 30 reaches the working position. The configuration of the shim does not matter.

[0023]

As described above, according to the present invention, when the side frame is driven to the vehicle width expanding position, the second contact portion provided in the fitting hole of the side frame connects the track frame. The position of the side frame is fixed by contacting the first contact portion provided on the portion so that both flange peripheral surfaces of the lower roller are in surface contact with the inner surface of the track shoe. Even without using a separate wedge-shaped shim, a phenomenon in which a large load acts only on the inner flange of the lower roller can be prevented, and the distance between the overturning fulcrums can be maintained long. Therefore, the work of attaching and detaching and storing the wedge-shaped shim can be omitted, and even if the side frame and the track frame move relatively to each other at the time of starting or stopping, the first and second contact portions maintain the contact state. No problem. Also, unlike the case of the wedge-shaped shim described above,
Since the contact surface of the contact portion can be made large, fatigue and wear of the contact surface can be minimized. Also, the first
And the contact surface of the second contact portion is substantially a horizontal plane, in other words, a surface substantially parallel to the moving direction of the side frame (vehicle width expanding / contracting direction). Even if a force in the horizontal plane is generated on the side frame at the time of stop, excessive force due to the wedge effect is not generated and acts on the contact surface, so that the contact portion of the track frame and the side frame can be prevented from being damaged, Wear of the contact surface can be suppressed to a minimum. Further, if one of the contact portions, for example, the second contact portion is slightly longer in the vehicle width expanding / contracting direction, and if it becomes necessary to change the vehicle width expanding position of the side frame, the first and the second positions are changed at the time of the change. There is no need to change the position of the second contact portion, and the change operation can be easily performed. In particular, if the block is accommodated in a bottomed hole movably in the up and down direction, and a block projection amount can be adjusted by interposing a shim between the bottom of the hole and the block, the distance between the side frame and the connecting portion is reduced. The vertical position of the substantially horizontal plane of the block can be easily adjusted according to the gap.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main part of a crawler traveling body according to an embodiment of the present invention, showing a state where a side frame is at a working position.

FIG. 2 is an enlarged view showing a part of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a cross-sectional view showing a state where the side frame is at a transportation position.

FIG. 5 is a view corresponding to FIG. 1 showing another embodiment.

FIG. 6 is a plan view showing an entire configuration of a conventional crawler type traveling body.

FIG. 7 is a sectional view taken along the line VII-VII.

FIG. 8 is a sectional view showing a conventional example using a wedge-shaped shim.

FIG. 9 is an enlarged view showing a part of FIG. 8;

FIG. 10 is a plan view of FIG. 8;

[Explanation of symbols]

 2 Slewing bearing 4 Lower roller 4a Inner flange 4b Outer flange 6 Track shoe 7 Hydraulic cylinder 20 Track frame 21 Connecting portion 21b Block mounting table 30 Side frame 31 Fitting hole 31a Projection 41 Block 41a Slope 42 Shim 43 Stopper

Claims (3)

(57) [Claims] A track frame having connecting portions projecting from both side ends; a driving wheel and an idle wheel rotatably supported; and a fitting hole into which the connecting portion is loosely fitted. A pair of left and right side frames respectively slidably disposed laterally with respect to the track frame via holes, and these side frames are substantially horizontally moved between a predetermined vehicle width expanding position and a vehicle width reducing position. Drive means for driving in the direction, a plurality of lower rollers having an inner flange and an outer flange, rotatably supported on the lower surface of the side frame between the drive wheel and the idler wheel, wound around the idler wheel, the crawler type traveling body that includes a track shoe which is driven while being guided by the at least the plurality of lower rollers by the rotation of the drive wheels, a predetermined portion of the upper surface of the connecting portion, Ryakusui The first contact portion is protruded having a face, a predetermined箇of the upper surface of the fitting hole that faces the upper surface of the connecting portion
The place, have a first contact portion and the surface-contactable substantially horizontal
The second contact portion is protruded, and holds a non-contact state and the second contact portion and the first contact portion when the side frame is in said vehicle width retracted position, the side of When the frame is driven to the vehicle width enlarged position, the substantially horizontal plane of the first and second contact portions
A crawler-type traveling body, wherein the side frames are brought into surface contact with each other to hold the side frame in such a position that both flange peripheral surfaces of the lower roller are in surface contact with the inner surface of the track shoe. 2. Track tracks having connecting portions projecting from both side ends
Laem and The drive and idle wheels are rotatably supported and
The connecting portion has a fitting hole in which the connecting portion is loosely fitted.
Can slide to the side of the track frame
A pair of left and right side frames arranged Set these side frames at the specified vehicle width enlargement position and vehicle width reduction
Driving means for driving in a substantially horizontal direction between the position, It has an inner flange and an outer flange, and has a play with the drive wheel.
Said size between the driving wheel Rotatably supported on the underside of the frame
A plurality of lower rollers held, It is hung around the driving wheel and the idler wheel, and is rotated by the rotation of the driving wheel.
At least while being guided by the plurality of lower rollers.
Crawler-type traveling body equipped with a track shoe
hand, Immerse in a predetermined part of the connecting part from the upper surface of the connecting part
A bottomed hole is provided, A first abutment part in which at least a part of the upper surface is substantially horizontal
Wherein the first contact portion is above the connecting portion.
Housed in the hole so as to protrude from the surface, A predetermined part of the upper surface of the fitting hole facing the upper surface of the connecting portion
Has a substantially horizontal surface capable of surface contact with the first contact portion.
A second abutment portion that protrudes, When the side frame is at the vehicle width reduction position
The first contact portion and the second contact portion are in a non-contact state.
Holds and the side frame drives to the vehicle width enlarged position
The first and second contact portions are substantially the same in the horizontal plane.
The side frame is brought into surface contact with the lower roller.
Both flanges are in contact with the inner surface of the track shoe
Characterized in that it is configured to be held in a touching posture.
Roller type traveling body. 3. The block is allowed to move vertically.
And housed in the bottomed hole, the bottom of the hole and the
Insert a shim between the block and the upper surface of the connecting part.
Characterized in that the block protrusion amount can be adjusted.
The crawler-type traveling body according to claim 2.