JPH1179009A - Crawler type travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress continuous impact noises when a crawler is caught in a sprocket, over a long period with reliability. SOLUTION: A crawler receiver 24 comprises a front guide block 25, a rear guide block 26, a skid block 27 held vertically movable in engagement with these guide blocks 25 and 26, coil springs 28 for forcing the skid block 27 upward, and a skid-block locking mechanism 29 for permitting the upward displacement and checking the downward displacement of the skid block 27. Because of this constitution, even if the crawler sliding surface 27C of the skid block 27 wears out, the springs 28 and locking mechanism 29 press the sliding surface 27C into a constant slide on the crawler to thus suppress continuous impact noises caused while the crawler is caught in the sprocket.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track-type traveling device suitably used for a tracked vehicle such as a hydraulic shovel and a hydraulic crane.

[0002]

2. Description of the Related Art Construction machines such as hydraulic shovels and hydraulic cranes are usually equipped with crawler-type traveling devices for traveling on construction sites such as rough lands and muddy lands.

[0003] Such a crawler-type traveling device generally has side frames on the left and right sides of a center frame, and one side of the side frames in the front-rear direction is a sprocket-side bracket and the other side is an idler-side bracket. It comprises a frame, a sprocket provided on a sprocket-side bracket of a truck frame and an idler provided on an idler-side bracket, and a crawler belt wound between the sprocket and the idler. When the sprocket is driven to rotate, the crawler belt meshing with the sprocket becomes a sprocket,
The lower traveling body travels around the idler and each roller.

[0004] By the way, it is known that noise occurs when the crawler belt orbits between the sprocket and the idler when the undercarriage provided with the crawler-type traveling device travels. It can be roughly divided into continuous blow sounds. Here, the intermittent hitting sound is generated by the crawler hitting the sprocket intermittently due to the waving vibration generated between the upper roller and the sprocket when the crawler goes around, and the continuous hitting sound is When a crawler belt composed of a large number of links is wound around a sprocket so as to draw a polygonal shape, the links are caused to continuously mesh with the sprocket while moving up and down.

On the other hand, in order to reduce continuous striking sound caused by a crawler belt being wound around a sprocket in a polygonal shape, for example, Japanese Utility Model Laid-Open No. 50-133635 discloses a position between an upper roller and a sprocket. A crawler-type traveling device provided with a crawler belt receiving member for supporting the crawler belt from below is disclosed. According to this crawler belt type traveling device, the crawler belt is supported from below by the crawler belt receiving member, and the crawler belt is guided so as to be tangentially wound around the sprocket, so that the crawler belt moves up and down when it meshes with the sprocket. Can be suppressed, and the continuous hitting sound when the crawler belt meshes with the sprocket can be reduced.

[0006]

However, since the above-described crawler belt receiving member according to the prior art is fixed to the track frame via a support member or the like, the vertical mounting position of the crawler belt receiving member with respect to the sprocket is always constant. It has become.

For this reason, if the crawler belt receiving member wears due to constant sliding contact with the lower surface of the orbital driven crawler belt, it becomes difficult to support the crawler belt from below by the crawler belt receiving member. Therefore, there is a problem that the continuous hitting sound when the crawler belt meshes with the sprocket cannot be reduced over a long period of time.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a crawler-type traveling system capable of reliably reducing continuous hitting sound when a crawler belt is wound around a sprocket for a long period of time. It is intended to provide a device.

[0009]

In order to solve the above-mentioned problems, the present invention has side frames on both left and right sides of a center frame, one side of the side frames in the front-rear direction is a sprocket side bracket, and the other side is a sprocket side bracket. Crawler track comprising: a track frame serving as an idler-side bracket; a sprocket provided on a sprocket-side bracket of the track frame; an idler provided on the idler-side bracket; and a crawler track wound between the sprocket and the idler. Applicable to traveling devices.

A feature of the first aspect of the present invention is that a crawler belt receiving device is provided on the upper surface of the sprocket-side bracket near the sprocket, and the crawler belt receiving device is disposed on the upper surface of the sprocket-side bracket. A pair of guide blocks provided in the direction, a skid block provided between the respective guide blocks so as to be vertically displaceable and having an upper surface serving as a crawler belt sliding contact surface, and the sprocket-side bracket and the skid block. A sprung member provided between the sprocket-side bracket and the skid block, the spring member being provided between the sprocket-side bracket and the skid block, and allowing the skid block to be displaced upward by the spring member. And a skid block locking mechanism for inhibiting displacement.

With this configuration, the crawler belt that is driven to rotate between the sprocket and the idler is tangentially wound around the sprocket by sliding on the crawler belt sliding contact surface of the skid block. Thereby, the vertical movement when the crawler belt is wound around the sprocket in a polygonal shape is suppressed, and the continuous striking sound when the crawler belt and the sprocket mesh with each other can be reduced.

At this time, even if the crawler belt sliding contact surface of the skid block is worn, the skid block is displaced upward along each guide block by the spring member so as to follow this wear. By prohibiting the skid block from being displaced downward by the skid block locking mechanism, the crawler belt sliding contact surface of the skid block can always be kept in sliding contact with the crawler belt. Instead, the crawler belt can be guided to be tangentially wound around the sprocket.

According to a second aspect of the present invention, the skid block locking mechanism is provided on a claw member provided on an upper surface of the sprocket side bracket and on a side surface of the skid block.
A latch member which is disengaged from the pawl member when the skid block is displaced upward, and which engages with the pawl member when the skid block is about to be displaced downward to prohibit the skid block from being displaced downward. It is in.

With this configuration, when the skid block is displaced upward in accordance with wear of the crawler belt sliding contact surface, the claw member is disengaged from the latch member of the skid block. When the skid block is going to be displaced downward, the claw member is engaged with the latch member of the skid block, whereby the downward displacement of the skid block is prohibited, and the crawler belt sliding contact surface is brought into sliding contact with the crawler belt. The skid block can be held in position.

Further, according to a third aspect of the present invention, the pawl member is rotatably provided on the upper surface of the sprocket-side bracket via a bracket and a pin, and the latch member is provided continuously on the side surface of the skid block in the vertical direction. And a plurality of latches.

With this configuration, when the skid block is displaced upward due to abrasion of the crawler belt sliding contact surface, each latch provided on the skid block pivotally displaces the claw member and separates from the claw member. Then, after the skid block is displaced upward in accordance with the wear of the crawler belt sliding contact surface, one of the latches is engaged with the claw member to prohibit the displacement of the skid block downward,
The skid block can be held at an appropriate position according to the wear amount of the crawler belt sliding contact surface.

Further, the invention according to claim 4 is characterized in that the guide block and the skid block are provided with a concave and convex engaging portion located in the front-rear direction.

With this configuration, the skid block can be positioned in the front-rear direction by the guide block. When the crawler belt is driven forward or backward, the skid block is positioned by the skid block. Tracks can be guided.

Further, the invention of claim 5 is that the crawler belt sliding contact surface of the skid block is formed substantially parallel to the tangent line so that the crawler belt is wound tangentially to the sprocket.

With this configuration, the crawler belt wound around the sprocket can be brought into sliding contact with the crawler belt sliding contact surface of the skid block, and the crawler belt can be guided so as to be tangentially wound around the sprocket.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a crawler-type traveling device according to the present invention will be described below in detail with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a lower traveling body of a hydraulic shovel, and 2 denotes a track frame constituting the lower traveling body 1. The track frames 2 are disposed on a center frame 3 and on both left and right sides of the center frame 3. And a pair of side frames 4 (only one is shown) extending in the front-rear direction.

A sprocket-side bracket 5 is provided on one side of the side frame 4 in the front-rear direction, and an idler-side bracket 6 is provided on the other side.

Here, as shown in FIGS. 2 and 3, the sprocket-side bracket 5 is fixed to the connection end plate 7 fixed to one end of the side frame 4 by welding or the like.

The sprocket-side bracket 5 is
A thick mounting plate 8 having a large-diameter hole 8A for mounting a traveling motor 13 described later, a plurality of screw holes 8B provided around the large-diameter hole 8A, and an upper outer periphery of the mounting plate 8 An upper reinforcing plate 9 for covering, a lower reinforcing plate 10 for covering a lower outer periphery,
Semicircular rear reinforcing plate 11 fixed to the side surface of mounting plate 8
And the upper reinforcing plate 9 forms the upper surface of the sprocket-side bracket 5.

Here, as shown in FIG. 2, the upper edge of the mounting plate 8 to which the upper reinforcing plate 9 is fixed is inclined upward by an angle θ with respect to the horizontal direction. The reinforcing plate 9 is also configured to be inclined upward by the angle θ.

Reference numeral 12 denotes a driving device mounted on the sprocket-side bracket 5. The driving device 12 includes a traveling motor 13 and a speed reducer 1 for reducing the rotation of the traveling motor 13.
4 and a sprocket 15 mounted on the output side of the speed reducer 14. Then, the output of the traveling motor 13 is reduced by the speed reducer 14 and the sprocket 15 is rotationally driven, whereby the crawler belt 19 wound between the sprocket 15 and the idler 16 described later is driven to rotate.

Reference numeral 16 denotes an idler attached to the idler-side bracket 6. The idler 16 is constantly urged in a direction away from the sprocket 15 by a crawler belt tension adjusting device (not shown) provided in the side frame 4. ,
The crawler belt 19 wound between the sprocket 15 and the sprocket 15 is given an appropriate tension.

Reference numerals 17 and 17 denote two upper rollers rotatably provided on the upper surface side of the side frame 4.
7 prevents the crawler belt 19 from contacting the side frame 4 while supporting the crawler belt 19 from below. 18, 18,
Are lower rollers arranged in a row on the lower surface side of the side frame 4. Each lower roller 18 supports the side frame 4 on a crawler belt 19 together with a sprocket 15 and an idler 16.

Reference numeral 19 denotes a sprocket 15, an idler 16,
A crawler belt wound around each upper roller 17 and each lower roller 18 is shown. As shown in FIG. 4 and FIG.
A plurality of links 20 facing each other in the left-right direction are connected endlessly by pins 21, and a cylindrical bush 22 meshing with the sprocket 15 is fitted on the outer peripheral side of the pins 21. A plate-like shoe 23 is fixed to the left and right links 20, and the shoe 23 extends in the width direction of the crawler belt 19.

Then, the sprocket 15 is driven to rotate,
A bush 22 fitted to a pin 21 connecting each link 20
Are sequentially engaged with each other so that the crawler belt 19 is
5, the idler 16, the upper roller 17, and the lower roller 18 are driven to rotate, and the lower traveling body 1 travels.

Reference numeral 24 denotes a crawler belt receiving device which is provided near the sprocket 15 and is provided on the upper reinforcing plate 9 of the sprocket side bracket 5, and as shown in FIG. Blocks 25 and 26
, A skid block 27, each coil spring 28, and a skid block locking mechanism 29.

25 and 26 are sprocket side brackets 5
A pair of front guide blocks and a rear guide block are respectively provided on the upper surface of the upper reinforcing plate 9 constituting the front and rear directions, and the front guide block 25 and the rear guide block 26 are provided on surfaces facing each other. Engagement grooves 25A and 26A are formed as concave engagement portions extending in the vertical direction, and are formed as a steel block body having a U-shaped cross section as a whole.

The guide blocks 25, 26
Is fixed to the upper surface of the upper reinforcing plate 9 by welding or the like so as to be opposed in the front-rear direction. When the crawler belt 19 is driven in the forward direction or in the backward direction, the guide blocks 25 and 26 are moved between the guide blocks 25 and 26. The skid block 27 is guided vertically.

Reference numeral 27 denotes a skid block provided between the front guide block 25 and the rear guide block 26 so as to be vertically displaceable.
Is formed as a substantially trapezoidal steel block body.

The engagement groove 25 of the front guide block 25 is formed on the front surface of the skid block 27 in the length direction.
A as an engagement protrusion which slidably engages with the engagement portion 27
A is protruded, and an engagement projection 27B as a projection engagement portion that is slidably engaged with the engagement concave groove 26A of the rear guide block 26 is provided on the rear surface in the longitudinal direction. . Therefore,
The skid block 27 is positioned in the front-rear direction between the front guide block 25 and the rear guide block 26, and is configured to be vertically displaceable while being guided by the engagement grooves 25A and 26A. A latch member 33 described later is provided on the left side surface of the skid block 27 in the width direction.

Further, the upper surface of the skid block 27
Since the crawler belt 19 is guided in a tangential direction with respect to the sprocket 15, the crawler belt sliding contact surface 27C which slides on the lower surface of each link 20 constituting the crawler belt 19 is formed.
As shown in FIG. 4, when the crawler belt 19 is wound tangentially to the sprocket 15, it is formed so as to be substantially parallel to a tangent L to the pitch circle P of the sprocket 15.

The upper ends of the engagement projections 27A and 27B are chamfered in a curved shape so as to prevent the joint between the links 20 from being caught when the links 20 of the crawler belt 19 come into sliding contact with the skid block 27. I have.

Are three coil springs as spring members provided between the upper surface of the upper reinforcing plate 9 and the skid block 27. Each coil spring 28 is provided between the guide blocks 25 and 26. And are arranged at equal intervals on the upper reinforcing plate 9. Here, each coil spring 28
For example, the lower end is fixed to the upper reinforcing plate 9 by welding or the like, and the free upper end is in contact with the lower surface of the skid block 27 to constantly bias the skid block 27 upward. The spring force acting on the skid block 27 from each coil spring 28 is generated when the crawler belt 19 slides on the crawler belt sliding contact surface 27C of the skid block 27 during traveling or the like.
7 is set to be larger than the downward load acting on.

Reference numeral 29 denotes a skid block locking mechanism provided between the upper reinforcing plate 9 of the sprocket side bracket 5 and the skid block 27. The skid block locking mechanism 29 is provided on the upper reinforcing plate 9. And a latch member 33 provided on the left side surface of the skid block 27.

Numeral 30 denotes a claw member provided on the upper surface of the upper reinforcing plate 9, and this claw member 30
A pair of support brackets 31, 31, which are located near 26 and fixed to the upper surface of the upper reinforcing plate 9, are rotatably supported via pins 32. Here, the claw member 30 protrudes toward the skid block 27, and engages with an engagement claw portion 30 </ b> A that engages with and disengages with later-described latches 33 </ b> A to 33 </ b> D constituting the latch member 33, and contacts the upper surface of the upper reinforcing plate 9. The stopper portion 30B is in contact with a flat surface.

Reference numeral 33 denotes a latch member provided on the left side surface of the skid block 27. The latch member 33 has a plurality of (four in the present embodiment) latches which are saw-toothed at a constant pitch in the vertical direction. 33A, 33B, 33
C, 33D, each latch 33A-
33D extends in the length direction of the skid block 27.

When the crawler belt sliding contact surface 27C of the skid block 27 is not worn, the latch member 33 is provided with the latch 33A on the engaging claw portion 30A of the claw member 30 as shown by a solid line in FIG. And at this time, the claw member 3
When the zero stopper portion 30B abuts on the upper surface of the upper reinforcing plate 9, the skid block 27 is prohibited from being displaced downward.

On the other hand, when the skid block 27 is displaced upward by the respective coil springs 28 in response to the wear of the crawler belt sliding contact surface 27C, the latch 33B of the latch member 33 presses the claw member 30 upward, thereby causing the claw member 30 to move upward. 30 is displaced about the pin 32 as indicated by a two-dot chain line. As a result, the engaging claw portion 30A of the claw member 30 is disengaged from the latch 33A, and the skid block 27 is displaced upward by each coil spring 28 by an amount corresponding to the wear of the crawler belt sliding contact surface 27C.

When the skid block 27 is going to be displaced downward, the latch 33
Any of A to 33D is a claw member 30 (an engagement claw portion 30A)
, The downward displacement of the skid block 27 is prohibited, and the skid block 27
The track 9 is held at a position where the crawler belt sliding contact surface 27 </ b> C is always in sliding contact with the lower surface of each of the links 20 forming the link 9.

In this embodiment, the crawler belt 19 is wound around a sprocket 15, an idler 16, an upper roller 17 and a lower roller 18, and the idler 1
An appropriate tension is applied by a crawler belt tension adjusting device (not shown) provided between the side frame 4 and the side frame 4. When the sprocket 15 is rotationally driven in this state, the sprocket 15 sequentially meshes with the bush 22 of the crawler belt 19, so that the crawler belt 19 is driven to rotate and the lower traveling body 1 travels.

At this time, as shown by the solid line in FIG. 5, the latch 33A of the latch member 33 engages with the engaging claw 30A of the claw member 30 to prevent the skid block 27 from being displaced downward. Ban. Thus, the skid block 27 is held at a position where the crawler belt sliding contact surface 27C is slid on the lower surface of the link 20 constituting the crawler belt 19, and supports the crawler belt 19 from below at this position.

Since the skid block 27 is provided between the guide blocks 25 and 26 which are disposed on the upper surface of the upper reinforcing plate 9 in the front-rear direction, the crawler belt 19 is driven forward or backward. When driven in the direction, the skid block 27 is connected to each guide block 25,
The guide 26 can guide in the up-down direction while positioning in the front-rear direction.

As a result, as shown in FIG.
When the bush 2 is wound around the sprocket 15, each bush 2
The line connecting the centers of the upper roller 17 and the sprocket 15
Is maintained substantially coincident with the tangent line L connecting the pitch circle P of FIG.

[0050] Thus, the skid block 27 is
9 is guided so as to be wound substantially tangentially to the sprocket 15 so that the crawler belt 19 is
Up and down movement when rolled into a polygonal shape can be suppressed, and continuous hitting sound when the crawler belt 19 meshes with the sprocket 15 can be reduced.

When the crawler belt sliding contact surface 27C of the skid block 27 is worn by constantly sliding each link 20 of the crawler belt 19, the skid block 27
Means that each of the coil springs 2 corresponds to the wear of the crawler belt sliding contact surface 27C.
8 displaces upward.

At this time, as the skid block 27 is displaced upward following the wear of the crawler belt sliding contact surface 27C, the latch member 3 provided on the side surface of the skid block 27 is moved.
When the third member 3 is displaced upward, the claw member 30 is pivotally displaced from the position indicated by the solid line in FIG. 5 to the position indicated by the two-dot chain line, and the latch 33A is disengaged from the engagement claw portion 30A of the claw member 30.

When the wear amount of the crawler belt sliding contact surface 27C exceeds the pitch between the latches 33A and 33B of the latch member 33, as shown in FIG.
Engages with the engaging claw portion 30A of the claw member 30 to prohibit the skid block 27 from being displaced downward. As a result, the skid block 27 is brought into contact with the worn crawler belt sliding contact surface 27.
C is held at a position where it slides on the lower surface of the link 20 constituting the crawler belt 19, and the crawler belt 19 is supported from below at this position so that the crawler belt 19 is wound substantially tangentially to the sprocket 15. invite.

Thus, even if the crawler belt sliding contact surface 27C is worn, the skid block 27 has the crawler belt sliding contact surface 2C.
7C is lifted by each coil spring 28 by the amount of wear, and the crawler belt sliding contact surface 27C can be always in sliding contact with the lower surface of the crawler belt 19.

When the latch member 33 is displaced upward with the skid block 27, the latch member 33
Are engaged with the claw member 30 in a stepwise manner according to the wear amount of the crawler belt sliding contact surface 27C.
The skid block 27 can be held at a position where the crawler belt sliding contact surface 27C is always in sliding contact with the lower surface of the crawler belt 19.

As a result, the crawler belt 19 can be kept substantially tangentially wound around the sprocket 15 by the skid block 27 regardless of the wear of the crawler belt sliding contact surface 27C, and the crawler belt 19 meshes with the sprocket 15. The continuous striking sound can be reliably reduced over a long period of time.

In the above embodiment, the case where the coil spring 28 is used as the spring member has been described as an example, but the present invention is not limited to this, and for example, a disc spring, a leaf spring, or the like may be applied. .

In the above embodiment, the front guide block 25 and the rear guide block 26 are provided with engaging grooves 25A, 26A as concave engaging portions,
Although the case where the engagement projections 27A and 27B as the projection engagement portions are provided on the example has been described as an example, the present invention is not limited to this. Alternatively, the skid block 27 may be provided with a concave engaging portion.

Further, in the above-described embodiment, the crawler type traveling apparatus applied to the lower traveling body of the hydraulic shovel has been described as an example. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention can be applied to a lower traveling body.

[0060]

As described above in detail, according to the first aspect of the present invention, the crawler belt receiving device provided on the upper surface of the sprocket side bracket is provided with a guide block having an engaging groove extending vertically and the guide block. A skid block displaceably provided in the engagement groove of the present invention, a skid block having an upper surface serving as a crawler belt sliding contact surface, a spring member for constantly urging the skid block upward, and allowing the skid block to be displaced upward and displaced downward And a skid block locking mechanism that prohibits the wear of the crawler belt, so that even if the crawler belt sliding contact surface of the skid block is worn, the skid block is displaced upward by the spring member to thereby adjust the crawler belt sliding contact surface. Can always be kept in sliding contact. At this time, by prohibiting the skid block from being displaced downward by the skid block locking mechanism, the skid block can be held at a position where the crawler belt sliding contact surface is in sliding contact with the crawler belt.

As a result, the skid block can always guide the crawler belt to be wound tangentially to the sprocket irrespective of the wear of the crawler belt sliding contact surface, and the continuous hit when the crawler belt meshes with the sprocket. Sound can be reliably reduced over a long period of time.

According to the second aspect of the present invention, the skid block locking mechanism is provided on the claw member provided on the upper surface of the sprocket side bracket and on the side surface of the skid block, and when the skid block is displaced upward. When the skid block is disengaged from the claw member and is to be displaced downward, the latch member is engaged with the claw member. Is engaged with the latch member, thereby prohibiting the skid block from being displaced downward. Thereby, the skid block can be always held at the position where the crawler belt sliding contact surface is in sliding contact with the crawler belt.

Further, according to the third aspect of the present invention, the pawl member is rotatably provided on the upper surface of the sprocket side bracket via the bracket and the pin, and the latch member is continuously provided on the side surface of the skid block in the vertical direction. When the skid block is displaced upward according to the wear of the crawler belt sliding contact surface, the pawl member can be gradually engaged with each latch provided on the side surface of the skid block. . For this reason, the skid block can be held at an appropriate position according to the wear amount of the crawler belt sliding contact surface, and the skid block can always guide the crawler belt so that the crawler belt is tangentially wound around the sprocket. it can.

According to the fourth aspect of the present invention, since the guide block and the skid block are provided with the concave and convex engaging portions located in the front-rear direction, the crawler belt driven in the forward or backward direction is provided. The sliding block that slides in
The guide block can guide in the vertical direction while positioning in the front and rear direction.

According to the fifth aspect of the present invention, the crawler belt sliding contact surface of the skid block is formed substantially parallel to the tangent line so that the crawler belt is tangentially wound around the sprocket. By sliding the lower surface of the crawler belt on the sliding surface of the crawler belt, the crawler belt can always be guided so as to be tangentially wound around the sprocket, and the continuous impact sound when the crawler belt meshes with the sprocket is ensured. Can be reduced.

[Brief description of the drawings]

FIG. 1 is an external view showing a lower traveling body to which a crawler-type traveling device according to an embodiment of the present invention is applied.

FIG. 2 is a partially enlarged view showing the sprocket-side bracket, the crawler belt receiving device, and the like in FIG.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a partially enlarged view showing a state where the skid block is in sliding contact with the lower surface of the crawler belt.

FIG. 5 is a cross-sectional view as seen from a direction indicated by arrows VV in FIG. 4;

FIG. 6 is an exploded perspective view showing the crawler belt receiving device.

FIG. 7 is a sectional view similar to FIG. 5, showing a state in which the skid block is displaced upward following wear of the crawler belt sliding contact surface.

[Explanation of symbols]

 2 Track frame 3 Center frame 4 Side frame 5 Sprocket side bracket 15 Sprocket 19 Crawler belt 20 Link 24 Crawler belt receiver 25 Front guide block 26 Rear guide block 25A, 26A Engagement groove (concave engagement part) 27 Skid block 27A, 27B Engagement projection (convex engagement portion) 27C Crawler belt sliding contact surface 28 Coil spring (spring member) 29 Skid block locking mechanism 30 Claw member 31 Support bracket 32 Pin 33 Latch member 33A, 33B, 33C, 33D Latch

Claims (5)

[Claims] 1. A track frame having side frames on both left and right sides of a center frame, one side of the side frame in the front-rear direction serving as a sprocket side bracket and the other side serving as an idler side bracket, and a sprocket side bracket of the track frame. An idler provided on the sprocket and idler side bracket provided on the
In a crawler-type traveling device including a crawler belt wound between the sprocket and an idler, a crawler belt receiving device is provided on an upper surface of the sprocket-side bracket near the sprocket, and the crawler belt receiving device includes: A pair of guide blocks provided in the front-rear direction on the upper surface of the sprocket-side bracket, and a skid block provided between the respective guide blocks so as to be vertically displaceable and the upper surface serving as a crawler belt sliding contact surface,
A spring member provided between the sprocket-side bracket and the skid block and constantly biasing the skid block upward; and a spring member provided between the sprocket-side bracket and the skid block, wherein the skid block is And a skid block locking mechanism for prohibiting downward displacement of the crawler type traveling apparatus. 2. The skid block locking mechanism includes a claw member provided on an upper surface of the sprocket-side bracket and a claw member provided on a side surface of the skid block, and detaches from the claw member when the skid block is displaced upward. 2. The crawler-type traveling device according to claim 1, further comprising: a latch member that engages with the claw member to prevent the skid block from being displaced downward when the skid block is displaced downward. 3. A plurality of claw members provided rotatably on an upper surface of the sprocket-side bracket via a bracket and a pin, and a plurality of latch members provided continuously on a side surface of the skid block in a vertical direction. 3. The crawler-type traveling device according to claim 2, wherein the crawler-type traveling device is constituted by a latch. 4. The crawler-type traveling device according to claim 1, wherein the guide block and the skid block are provided with a concave and convex engaging portion located in a front-rear direction. 5. The crawler belt sliding contact surface of the skid block,
The crawler-type traveling device according to claim 1, 2, 3, or 4, wherein the crawler belt is formed substantially parallel to the tangent so as to be wound tangentially to the sprocket.