JPH11129948A - Crawler belt type travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise in the case where a crawler belt is rolled in a sprocket both at the time of advancing and at the time of retreating. SOLUTION: A curved bracket 32 engaged with the outer circumferential face of a small-diametric cylindrical part 21A of a housing 21, and a crawler belt guide member 31 comprising an upper side guide roller 33 and a lower side guide roller 35 provided in the bracket 32 are provided between the housing 21 constituting a drive unit 18 and a crawler belt 26 to allow the upper side guide roller 33 to abut to the crawler belt 26 when a sprocket 22 is rotated to its retreating side, and to allow the lower side guide roller 35 to abut to the crawler belt 26 when the sprocket 22 is rotated to its advancing side. By this constitution, the crawler belt 26 is guided to be rolled in to a tangent direction relating to the sprocket 22 both at the time of advancing and at the time of retreating to restrain up-and-down motion when the crawler belt 26 is rolled in the sprocket 22, and thereby noise is reduced.

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 A crawler-type traveling device is usually mounted on a lower traveling body of a construction machine such as a hydraulic excavator or a hydraulic crane for traveling on a construction site such as a wasteland or a muddy land.

[0003] Such a crawler-type traveling device is generally provided with a track frame having side frames on the left and right sides of a center frame, and one side of the track frame in the front-rear direction of the side frame. A drive having a power transmission mechanism for transmitting rotation to the housing, a sprocket provided in the housing of the drive and rotating integrally with the housing, an idler provided on the other side of the track frame in the front-rear direction of the side frame, and a sprocket And a crawler belt wound between the idler.

Here, the crawler belt is formed endless by sequentially connecting a plurality of links with pins, and a cylindrical bush that meshes with a sprocket is fitted on the outer peripheral side of the pins. The bushing sequentially meshes with a sprocket that is rotationally driven by the driving device, and the crawler belt circulates between the sprocket and the idler so that the lower traveling body travels.

By the way, when the undercarriage provided with the above-mentioned crawler-type traveling device travels, when the crawler orbits between the sprocket and the idler, the sprocket is formed so that a number of links constituting the crawler form a polygonal shape. In this case, there is a problem that the bush of the crawler belt and the sprocket continuously collide with each other to generate noise (hitting sound) or vibration.

Here, the reason why a continuous striking sound is generated when the crawler belt is wound around the sprocket will be described below with reference to FIGS. 9 and 10. FIG.

First, in the figure, 1 is a sprocket, 2
Indicates a crawler belt wound between a sprocket 1 and an idler (not shown). The crawler belt 2 is formed by sequentially connecting a plurality of links 3 via pins 4 so as to be rotatable. A bush 5 is fitted on the outer peripheral side of 4.

FIG. 9 shows that when the undercarriage retreats,
When the sprocket 1 rotates in the direction of the arrow Ar (retreating side), the bush 5 of the crawler belt 2 meshes with the sprocket 1 so that the link 3 is gradually wound on the sprocket 1 during the time points T1 to T5. Is shown.

In this case, the link 3 is wound around the sprocket 1 so as to draw a polygonal shape from an upper roller (neither is shown) provided on the upper surface side of the side frame, so that the bush 5 is bent along the curved line Br. It moves in the direction of the arrow with a trajectory as shown. At this time, a straight line connecting the center of the bush 5 at the time points T2 and T4 is a tangent line Cr to the pitch circle P of the sprocket 1. In contrast, at time T
Line C connecting the center of bush 5 at 1, T3 and T5
r 'is located at a position displaced downward by the amount of displacement Dr from the tangent line Cr.

As a result, when the bush 5 meshes with the sprocket 1 at the time T3, the bush 5
Between the time point 2 and the time point T3, the sprocket 1 moves up and down by the displacement amount Dr and violently collides with the sprocket 1. Thus, when the link 3 is wound around the sprocket 1, by repeating this phenomenon, it is considered that a continuous impact sound is generated.

On the other hand, FIG. 10 shows that the undercarriage is moving forward.
When the sprocket 1 rotates in the direction of the arrow Af (forward side), the bush 5 of the crawler belt 2 meshes with the sprocket 1 so that the link 3 is gradually wound on the sprocket 1 between time points t1 and t5. Is shown.

In this case, a gap is usually formed between the crawler belt 2 wound on the sprocket 1 from a lower roller (both not shown) provided on the lower surface side of the side frame and the ground. When the link 3 is wound around the sprocket 1 so as to draw a polygonal shape, the bush 5 moves in a direction indicated by an arrow along a trajectory indicated by a curved line Bf. At this time, the straight line connecting the center of the bush 5 at the time points t2 and t4 is a tangent line Cf to the pitch circle P of the sprocket 1. On the other hand, at times t1, t3, t5
Is a straight line Cf 'connecting the center of the bush 5 in FIG.
It is at a position displaced upward by a displacement amount Df from f.

As a result, when the bush 5 meshes with the sprocket 1 at time t3, the bush 5
Between the time point 2 and the time point t3, the sprocket 1 moves up and down by the displacement amount Df and violently collides with the sprocket 1. Thus, when the link 3 is wound around the sprocket 1, by repeating this phenomenon, it is considered that a continuous impact sound is generated.

On the other hand, for example, Japanese Utility Model Laid-Open No. 4-10097
No. 3, Japanese Utility Model Application Laid-Open No. Sho 52-61817 and the like, a rolling element is provided on a track frame between an upper roller and a sprocket, and a crawler belt wound around the sprocket is moved from below by a rolling element. A crawler-type traveling device configured to support is disclosed.

In the crawler-type traveling device according to the prior art, the sprocket is driven to rotate backward, and when the crawler belt is wound on the sprocket from above, the rolling element rolls the crawler belt tangentially to the sprocket. , The vertical movement when the crawler belt is wound around the sprocket in a polygonal shape can be suppressed, the bush of the crawler belt can be prevented from colliding with the sprocket, and noise can be reduced.

[0016]

However, in the above-described crawler-type traveling device according to the prior art, when the sprocket is driven to rotate forward and the crawler belt is wound on the sprocket from below, the rolling element moves the crawler belt to the sprocket. However, it cannot guide the crawlers to tangentially wind them, and there is a problem that the bush of the crawler belt continuously collides with the sprocket due to the vertical movement when the crawler belt is wound on the sprocket, thereby generating noise. .

The present invention has been made in view of the above-described problems of the prior art, and has a crawler-type traveling system capable of reliably reducing noise generated when the crawler belt is caught on a sprocket both when moving forward and when moving backward. It is intended to provide a device.

[0018]

In order to solve the above-mentioned problems, the present invention provides a track frame having side frames on both left and right sides of a center frame, and provided on one side of the track frame in the front-rear direction of the side frames, A driving device having a traveling motor and a power transmission mechanism for transmitting rotation of the traveling motor to the housing; a sprocket provided in the housing of the driving device and rotating integrally with the housing; and front and rear side frames of the track frame The present invention is applied to a crawler-type traveling device including an idler provided on the other side in the direction and a crawler belt wound between the sprocket and the idler.

A feature of the structure adopted by the first aspect of the present invention is that a crawler belt guide member for guiding the crawler belt to the sprocket is provided between the housing of the driving device and the crawler belt. A bracket that is engaged with the housing outer peripheral surface of the drive device, and an upper crawler belt support that is provided on the bracket near the upper portion of the sprocket and that abuts on the crawler belt when the sprocket rotates backward. A lower crawler belt support provided on the bracket near the lower portion of the sprocket and abutting on the crawler belt when the sprocket rotates forward.

With this configuration, when the sprocket rotates backward, the crawler belt is wound around the sprocket while contacting the upper crawler belt receiver. At this time, the vertical movement of the crawler belt can be suppressed by guiding the crawler belt so that the crawler belt is wound substantially tangentially with respect to the sprocket, and the impact sound generated when the crawler belt and the sprocket mesh with each other can be reduced. .

On the other hand, when the sprocket rotates forward, the crawler belt is wound around the sprocket while contacting the lower crawler belt receiver. At this time, the lower crawler belt guide guides the crawler belt so as to wind it almost tangentially to the sprocket, thereby suppressing vertical movement of the crawler belt and reducing the impact sound generated when the crawler belt and the sprocket mesh with each other. it can.

Further, the invention according to claim 2 is that the upper crawler belt support and the lower crawler belt support are constituted by rollers which smoothly contact the links constituting the crawler belts and guide the links to the sprocket while rotating. .

With this configuration, since the roller rotates while abutting on the link of the crawler belt wound around the sprocket, it is possible to prevent the roller from being worn out early due to the contact with the crawler belt. It is possible to reduce the impact sound generated at the time of meshing over a long period of time.

According to a third aspect of the present invention, the bracket has an arcuate portion curved along the outer peripheral surface of the housing of the drive device, and extends in the front-rear direction along the crawler belt from the upper end side of the arcuate portion. The upper arm provided, and extending in the front-rear direction along the crawler belt from the lower end side of the arc portion, and formed in a U-shape from the lower arm portion provided with the lower crawler belt receiver,
The arc portion is configured to engage with the outer peripheral surface of the housing of the drive device.

With this configuration, the upper crawler belt support provided on the upper arm portion of the bracket can be disposed near the upper portion of the sprocket simply by engaging the arc portion of the bracket with the outer peripheral surface of the housing of the drive device. The lower crawler belt support provided on the lower arm portion of the bracket can be disposed near the lower portion of the sprocket, and the configuration of the crawler belt guide member can be simplified.

The invention according to claim 4 is that the housing of the driving device is provided with a stopper member for restricting the movement of the bracket in the axial direction of the housing.

[0027] With this configuration, it is possible to restrict the movement of the bracket engaged with the outer peripheral surface of the housing of the drive device in the axial direction of the housing by the stopper member, and the upper crawler belt support provided on the bracket is provided. And the lower crawler belt support can be brought into contact with the crawler belt at an appropriate position.

The invention according to claim 5 is characterized in that a plurality of rolling elements are provided between the outer peripheral surface of the housing of the drive device and the bracket.

With this configuration, when the housing of the driving device rotates with the sprocket, the rolling element rolls between the outer peripheral surface of the housing and the bracket, so that the bracket and the outer peripheral surface of the housing are directly connected to each other. Without sliding contact, it is possible to reduce friction generated between the outer peripheral surface of the housing and the bracket, noise caused by the friction, and the like.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a crawler-type traveling device according to the present invention will be described below with reference to the accompanying drawings, taking an example in which the invention is applied to a lower traveling body of a hydraulic shovel.

First, FIGS. 1 to 6 show a first embodiment according to the present invention.
In FIG. 1, reference numeral 11 denotes a lower traveling body of a hydraulic shovel, and 12 denotes a track frame constituting the lower traveling body 11, respectively. The track frame 12 includes a center frame 13 and a pair of side frames 14 (only one is shown) which are disposed on the left and right sides of the center frame 13 and extend in the front-rear direction. A sprocket-side bracket 15 is provided on one side of the side frame 14 in the front-rear direction, and an idler-side bracket 16 is provided on the other side.

Here, the sprocket side bracket 15
Is a side frame 14 as shown in FIGS.
An attachment hole 15A for attaching a traveling motor 19, which will be described later, is fixed to a connection end plate 17 fixed to one side end of the vehicle by welding or the like.

Reference numeral 18 denotes a driving device mounted on the sprocket-side bracket 15. The driving device 18 is fitted into a mounting hole 15A of the sprocket-side bracket 15,
It comprises a traveling motor 19 fixed by bolts, and a speed reducer 20 described later connected to the output side of the traveling motor 19.

Reference numeral 20 denotes a speed reducer as a power transmission mechanism for reducing the rotation of the traveling motor 19 and transmitting the reduced speed to a sprocket 22, which will be described later. The speed reducer 20 includes a stepped cylindrical housing 21 and a housing 21 inside the housing 21. A reduction gear mechanism (both not shown) is housed and connected to an output shaft of the travel motor 19, and the rotation of the travel motor 19 is reduced by the reduction gear mechanism to rotate the housing 21. .

Here, the housing 21 has a small-diameter cylindrical portion 21A with which a later-described curved bracket 32 is engaged, and a large-diameter cylindrical portion 21B having a larger diameter than the small-diameter cylindrical portion 21A.
An annular flat surface portion 21C is formed between the small-diameter cylindrical portion 21A and the large-diameter cylindrical portion 21B. In addition, the small-diameter cylindrical portion 2
On the outer peripheral side of 1A, there are four screw holes 2 at even intervals.
1D, 21D,... Are provided, and in the large-diameter cylindrical portion 21B,
A flange portion 21E to which the sprocket 22 is attached is provided.

Reference numeral 22 denotes a housing 2 constituting the speed reducer 20.
1 is a sprocket fixed to the flange portion 21E by bolts.
Is operated to rotate integrally with the housing 21.

Reference numeral 23 denotes an idler attached to the idler side bracket 16. The idler 23 is constantly urged in a direction away from the sprocket 22 by a crawler belt tension adjusting device (not shown) provided in the side frame 14. Crawler 2 wound between the sprocket 22 and
6 has a moderate tension.

Reference numerals 24, 24 denote two upper rollers rotatably provided on the upper surface side of the side frame 14. Each upper roller 24 supports the crawler belt 26 from below while the crawler belt 26 contacts the side frame 14. Is prevented from doing so. 25,2
Reference numerals 5,... Denote a plurality of lower rollers arranged in a row on the lower surface side of the side frame 14. Each lower roller 25, together with a sprocket 22 and an idler 23,
4 is supported.

Reference numeral 26 denotes a sprocket 22, an idler 23,
2 shows a crawler belt wound around an upper roller 24 and a lower roller 25. As shown in FIGS. 5 and 6, the crawler belt 26 is formed endless by sequentially connecting a plurality of links 27 with pins 28, and a cylindrical bushing meshing with the sprocket 22 29 are fitted, and a plate-like shoe 30 is fixed to each link 27.

Reference numeral 31 denotes a crawler belt guide member provided between the housing 21 of the drive device 18 and the crawler belt 26. As shown in FIG. Upper guide roller 33 and lower guide roller 3 rotatably mounted on bracket 32
It consists of five.

Reference numeral 32 denotes a curved bracket constituting the crawler belt guide member 31. The curved bracket 32
It is made of a square steel bent in a U-shape along the outer peripheral surface of the small diameter cylindrical portion 21A. Here, the curved bracket 32
Is a semicircular arc portion 32A having an inner diameter substantially equal to the outer diameter of the small diameter cylindrical portion 21A, and an upper arm portion 32B extending in the front-rear direction along each link 27 of the crawler belt 26 from the upper end side of the arc portion 32A. And a lower arm portion 32C extending in the front-rear direction along each link 27 of the crawler belt 26 from the lower end side of the arc portion 32A, and the arc portion 32A is
The first small-diameter cylindrical portion 21A is slidably engaged with the outer peripheral surface.

Reference numeral 33 denotes an upper guide roller as an upper crawler belt receiver rotatably mounted on the distal end side of the upper arm portion 32B of the curved bracket 32.
The curved bracket 32 is rotatably attached to a pin 34 fixed to the distal end side of the upper arm portion 32B. When the sprocket 22 rotates in the direction indicated by the arrow Ar (retreating side) in FIG. 5, the upper guide roller 33 contacts each link 27 of the crawler belt 26 wound from above the sprocket 22 via the upper roller 24. The crawler belt 26 is guided so that a straight line passing through the center of the pin 28 that contacts and connects the links 27 is tangent to the pitch circle P of the sprocket 22.

Reference numeral 35 denotes a lower guide roller as a lower crawler belt receiver rotatably mounted on the distal end side of the lower arm portion 32C of the curved bracket 32. The lower guide roller 35 is
The bending bracket 32 is rotatably attached to a pin 36 fixed to the distal end side of the lower arm portion 32C. When the sprocket 22 rotates in the direction indicated by the arrow Af (forward side) in FIG. 5, the lower guide roller 35 causes each link 27 of the crawler belt 26 to be wound from below the sprocket 22 via the lower roller 25. The crawler belt 26 is guided so that a straight line passing through the center of the pin 28 that contacts the upper surface of the link 27 and connects the links 27 is tangent to the pitch circle P of the sprocket 22.

Reference numeral 37 denotes a small-diameter cylindrical portion 21A of the housing 21.
With a stopper ring fitted as a stopper member,
The stopper ring 37 has an inner diameter slightly larger than the outer diameter of the small-diameter cylindrical portion 21A of the housing 21. In the circumferential direction, the stopper ring 37 has the same pitch as the screw holes 21D provided in the small-diameter cylindrical portion 21A. 37A of through holes are formed. The stopper ring 37 is provided with the through hole 3.
The bolt 38 inserted into the housing 7A is screwed into the screw hole 21D to be fixed to the housing 21. The curved bracket 32 is sandwiched between the housing 21 and the flat surface portion 21C, and the curved bracket 32 moves in the axial direction of the housing 21. Is regulated.

The crawler-type traveling device according to the present embodiment has the above-described configuration. The crawler belt 26 includes a sprocket 22, an idler 23, an upper roller 24, and a lower roller 25.
And an appropriate tension is applied by a crawler belt tension adjusting device (not shown) provided between the idler 23 and the side frame 14. When the sprocket 22 is rotationally driven in this state, the sprocket 22 sequentially meshes with each of the bushes 29 constituting the crawler belt 26, so that the crawler belt 2 is rotated.
6 is driven to rotate, and the lower traveling body 11 travels.

At this time, the curved bracket 32 of the crawler belt guide member 31 has its arcuate portion 32A on the inner circumferential side of the housing 21.
Is held between the flat surface portion 21C of the housing 21 and the stopper ring 37 in a state of sliding contact with the outer peripheral surface of the small diameter cylindrical portion 21A. The upper guide roller 33 attached to the upper arm 32B of the curved bracket 32 rotates while contacting the lower surface of each link 27 on the upper side of the sprocket 22, and is attached to the lower arm 32C of the curved bracket 32. The lower guide roller 35 is attached to the sprocket 22.
Rotates while contacting the upper surface of each link 27 on the lower side of the link.

When the sprocket 22 rotates in the direction indicated by the arrow Ar in FIG. 5 when the lower traveling body 11 is retracted, the upper guide roller 33 is crawled around the sprocket 22 from above via the upper roller 24. By contacting the lower surface of each link 27 of 26, the vertical movement of each link 27 is regulated. Accordingly, a straight line passing through the center of the pin 28 connecting the links 27 is formed by the sprocket 22.
Track 26 so that it is tangent Cr to pitch circle P of
Can be guided to the sprocket 22.

On the other hand, when the sprocket 22 rotates in the direction indicated by the arrow Af in FIG. 5 when the lower traveling body 11 advances, the lower guide roller 35 is wound around the sprocket 22 from below via the lower roller 25. By contacting the upper surface of each link 27 of the crawler belt 26, the movement of each link 27 in the vertical direction is restricted. Thereby, a straight line passing through the center of the pin 28 connecting the links 27 is formed by the sprocket 2
Track 2 so that it is tangent to the pitch circle P
6 can be guided to the sprocket 22.

Thus, the upper guide roller 33 and the lower guide roller 35 of the crawler belt guide member 31 guide the respective links 27 of the crawler belt 26 so as to be wound substantially tangentially to the sprocket 22, so that the crawler belt 26 can move forward and forward. In any of the backward movements, the vertical movement of the crawler belt 26 when the crawler belt 26 is wound around the sprocket 22 in a polygonal shape can be suppressed, and the striking sound caused by the engagement of each bush 29 of the crawler belt 26 with the sprocket 22 can be effectively reduced. can do.

The upper guide roller 33 and the lower guide roller 35 are connected to the crawler belt 26 wound around the sprocket 22.
The upper guide roller 33 and the lower guide roller 35 can be prevented from being worn out early by contact with the link 27, and the bush 29 of the crawler belt 26 and the sprocket 22 mesh with each other. Occasional hitting noise can be reduced over a long period of time.

Further, the curved bracket 32 is connected to the speed reducer 2.
0 arc 21 curved along the outer peripheral surface of the housing 21
A and the upper arm portion 3 provided with the upper guide roller 33
2B and a lower arm portion 32C provided with a lower guide roller 35 are formed in a U-shape, and only by engaging the arc portion 32A with the outer peripheral surface of the housing 21, the upper guide roller 3 is formed.
3 can be arranged near the upper portion of the sprocket 22,
Since the lower guide roller 35 can be disposed near the lower portion of the sprocket 22, the configuration of the crawler belt guide member 31 can be simplified.

The stopper ring 3 is attached to the housing 21.
7, the movement of the curved bracket 32 in the axial direction of the housing 21 is restricted by the stopper ring 37. Therefore, the upper guide roller 33 and the lower guide roller 35 provided on the curved bracket 32 are provided.
Can always be brought into contact with each link 27 of the crawler belt 26 at an appropriate position.

Next, FIG. 7 shows a second embodiment according to the present invention. The feature of this embodiment is that a plurality of projections are formed on the surface of the curved bracket which engages with the outer peripheral surface of the housing of the drive unit. It has been provided. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 41 denotes a crawler belt guide member according to the present embodiment. Like the crawler belt guide member 31 according to the above-described first embodiment, the crawler belt guide member 41 includes a curved bracket 42 described later, Although it includes the upper guide roller 33 and the lower guide roller 35, the shape of the curved bracket 42 is different.

Reference numeral 42 denotes a housing 2 constituting the speed reducer 20.
The curved bracket 42 is a semicircular arc portion 42 having an inner diameter substantially equal to the outer diameter of the small diameter cylindrical portion 21A.
A, the upper arm portion 42B, and the lower arm portion 42C, but five concave portions 43, 43,... Are formed at regular intervals on the inner peripheral surface of the arc portion 42A. Four protrusions 44 are formed between the portions 43. When the curved bracket 42 is engaged with the outer peripheral surface of the small-diameter cylindrical portion 21A of the housing 21, only the projections 44 provided on the curved bracket 42 are in sliding contact with the outer peripheral surface of the small-diameter cylindrical portion 21A. .

The crawler-type traveling device according to the present embodiment has the crawler belt guide member 41 as described above, and the upper guide roller 33 and the lower guide roller 35 connect each link 27 of the crawler belt 26 to the sprocket 22 substantially. The basic operation of suppressing the vertical movement when the crawler belt 26 is wound around the sprocket 22 in a polygonal shape by guiding the crawler belt 26 to be wound in the tangential direction is particularly different from that according to the above-described first embodiment. Absent.

In this embodiment, however, the housing 2
1 rotates with the sprocket 22, only the projections 44 provided on the curved bracket 42
By sliding contact with the outer peripheral surface of the first bracket 1, the contact area between the housing 21 and the curved bracket 42 can be reduced, and noise generated by sliding contact between the housing 21 and the curved bracket 42 can be reduced. .

Next, FIG. 8 shows a third embodiment according to the present invention. The feature of this embodiment is that a plurality of rolling elements are provided between the outer peripheral surface of the housing of the driving device and the curved bracket. It is in. In the present embodiment, the same components as those in the above-described embodiments are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 51 denotes a crawler belt guide member according to the present embodiment. The crawler belt guide member 51 includes a curved bracket 52, a roller 54, and an upper guide roller 3 which will be described later.
3 and a lower guide roller 35.

Reference numeral 52 denotes a housing 2 constituting the speed reducer 20.
The curved bracket 52 is a semicircular arc portion 52 having an inner diameter substantially equal to the outer diameter of the small diameter cylindrical portion 21A.
A, the upper arm portion 52B, and the lower arm portion 52C, but on the inner peripheral surface of the arc portion 52A, five rectangular grooves 53, 53, extending along the axial direction of the housing 21.
Are recessed at regular intervals.

Reference numerals 54, 54,... Indicate rollers as rolling elements rotatably provided in the respective rectangular grooves 53 of the curved bracket 52. Each roller 54 has an axial direction smaller than the width dimension of the curved bracket 52. It has a dimension and is formed in a columnar shape having a diameter larger than the depth dimension of the rectangular groove 53. Each roller 54 slightly projects from the rectangular groove 53 in a state where the arc portion 52A of the curved bracket 52 is engaged with the outer peripheral surface of the small-diameter cylindrical portion 21A of the housing 21, and comes into contact with the outer peripheral surface of the small-diameter cylindrical portion 21A. It has become. Each roller 54 is a small-diameter cylindrical portion 21A of the housing 21.
Is stopped in the axial direction by a stopper ring 37 fitted to the shaft.

The crawler-type traveling apparatus according to the present embodiment has the crawler guide member 51 as described above, and its basic operation is not particularly different from that of each of the above-described embodiments.

In this embodiment, however, the housing 2
Since the rollers 54 are rotatably provided between the outer peripheral surface of the small-diameter cylindrical portion 21A and the arc portion 52A of the curved bracket 52, when the housing 21 rotates together with the sprocket 22, the curved bracket 52 and the housing 21 are rotated.
Since each roller 54 rolls between the outer peripheral surface and the outer peripheral surface of the housing 21 slidably contacts the curved bracket 52, noise generated by sliding contact can be avoided.
Wear of the curved bracket 52 and the housing 21 can be effectively suppressed.

In the above embodiments, the upper guide roller 33 and the lower guide roller 35 are rotatably provided on the curved bracket 32 (42, 52), and the upper guide roller 33 and the lower guide roller 35 are Sprocket 22
The configuration in which the crawler belt 26 is guided in such a manner that the crawler belt 26 is wound substantially tangentially to the sprocket 22 while rotating while being in contact with each link 27 of the crawler belt 26 wound around the sprocket 22, but the invention is not limited thereto Instead, for example, an upper crawler belt receiving member and a lower crawler belt receiving member composed of a block body that is always in sliding contact with each link 27 of the crawler belt 26 may be fixedly provided on the curved bracket 32.

In each of the above embodiments, the stopper ring 37 formed separately from the housing 21 is fixed to the housing 21 by bolts 38 in order to restrict the movement of the curved bracket 32 in the axial direction of the housing 21. Although the case has been described as an example, the present invention is not limited to this, and a configuration in which the retaining member is provided integrally with the housing 21 may be adopted.

Further, in each of the above-described embodiments, the crawler-type traveling device used for 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 also be applied to a lower traveling body of a tracked vehicle.

[0067]

As described above in detail, according to the first aspect of the present invention, a bracket is provided between the housing of the driving device and the crawler belt, the bracket being engaged with the outer peripheral surface of the housing of the driving device, and the bracket located near the upper portion of the sprocket. Since the crawler belt guide is composed of an upper crawler belt support provided on the bracket and a lower crawler belt support provided on the bracket near the lower portion of the sprocket, when the sprocket rotates backward, The crawler belt can be guided by the upper crawler belt so as to be wound substantially tangentially to the sprocket, and when the sprocket rotates forward, the crawler belt is substantially tangential to the sprocket by the lower crawler belt. Can be guided to get involved. As a result, regardless of the rotation direction of the sprocket, the vertical movement of the crawler belt when the crawler belt is wound around the sprocket can be suppressed, and the crawler belt and the sprocket are generated when the crawler belt and the sprocket mesh with each other during forward and backward movements. Noise can be reliably reduced.

According to the second aspect of the present invention, the upper crawler belt support and the lower crawler belt receiver are constituted by rollers which smoothly contact the links constituting the crawler belts and guide the links to the sprockets while rotating. In addition, it is possible to prevent the roller from being worn out early due to contact with the crawler belt, and it is possible to reduce the continuous impact sound generated when the crawler belt and the sprocket mesh with each other for a long time.

Further, according to the third aspect of the present invention, the bracket includes an arc portion curved along the outer peripheral surface of the housing of the drive device, an upper arm portion provided with an upper crawler belt support,
The lower arm portion provided with the lower crawler belt receiver is formed in a U-shape, and the arc portion is engaged with the outer peripheral surface of the housing of the drive device. The upper crawler belt support provided on the upper arm of the bracket can be arranged near the upper part of the sprocket simply by engaging the lower crawler belt with the lower arm of the bracket near the lower part of the sprocket. Thus, the configuration of the crawler belt guide member can be simplified.

According to the fourth aspect of the present invention, since the housing of the drive unit is provided with the stopper member for restricting the bracket from moving in the axial direction of the housing, the stopper is provided on the outer peripheral surface of the housing of the drive unit. The engaged bracket can be restricted from moving in the axial direction of the housing by the stopper member, and the upper crawler belt support and the lower crawler belt support provided on the bracket can be brought into contact with the crawler belt at an appropriate position. .

According to the fifth aspect of the present invention, since a plurality of rolling elements are provided between the outer peripheral surface of the housing of the drive device and the bracket, the bracket and the outer peripheral surface of the housing are in direct sliding contact. Therefore, the friction generated between the outer peripheral surface of the housing and the bracket, the noise caused by the friction, and the like 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 a first embodiment of the present invention is applied.

FIG. 2 is a partially enlarged view showing a driving device, a sprocket, a crawler belt guide member, and the like in FIG. 1 with a crawler belt removed.

FIG. 3 is a plan view showing a driving device, a sprocket, a crawler belt guide member, and the like in FIG. 2;

FIG. 4 is an exploded perspective view showing a housing, a crawler belt guide member, a stopper ring, and the like of the speed reducer.

FIG. 5 is a partially enlarged view showing a driving device, a sprocket, a crawler belt, a crawler belt guide member and the like in FIG. 1 in an enlarged manner.

6 is a cross-sectional view as seen from the direction of arrows VI-VI in FIG. 5;

FIG. 7 is an exploded perspective view similar to FIG. 4, showing a second embodiment according to the present invention.

FIG. 8 is an exploded perspective view similar to FIG. 4, showing a third embodiment according to the present invention.

FIG. 9 is an explanatory diagram showing a state in which a crawler belt link is wound around a sprocket rotating backward in the crawler belt type traveling device according to the related art over time.

FIG. 10 is an explanatory view showing a state in which a crawler belt link is wound around a sprocket rotating forward in the crawler belt type traveling device according to the related art over time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Track frame 13 Center frame 14 Side frame 18 Drive device 19 Traveling motor 20 Reduction gear (power transmission mechanism) 21 Housing 22 Sprocket 23 Idler 26 Crawler track 27 Link 31, 41, 51 Crawler track guide member 32, 42, 52 Curved bracket (bracket) ) 32A arc portion 32B upper arm portion 32C lower arm portion 33 upper guide roller (upper crawler belt receiver) 35 lower guide roller (lower crawler belt receiver) 37 stopper ring (stopper member) 54 roller (rolling element)

Claims (5)

[Claims] 1. A track frame having side frames on both left and right sides of a center frame, a traveling motor provided on one side of the track frame in the front-rear direction of the side frame, and a power transmission for transmitting rotation of the traveling motor to a housing. A driving device having a mechanism, a sprocket provided in a housing of the driving device and rotating integrally with the housing, an idler provided on the other side of the track frame in the front-rear direction of the side frame, and A crawler belt-type traveling device comprising a crawler belt wound around the crawler belt; a crawler belt guide member for guiding the crawler belt to the sprocket is provided between a housing of the drive device and the crawler belt; A bracket that engages the outer peripheral surface of the housing of the device, and near the top of the sprocket An upper crawler belt support that is provided on the bracket and is in contact with the crawler belt when the sprocket rotates in a retreating direction, and is provided on the bracket near a lower portion of the sprocket, and the sprocket is provided on the forward side. A crawler-type traveling device comprising: a lower crawler belt receiver that comes into contact with the crawler belt when rotating. 2. The crawler belt according to claim 1, wherein the upper crawler belt support and the lower crawler belt bracket are formed by rollers that smoothly contact the links constituting the crawler belts and guide the links to the sprocket. Crawler type traveling device. 3. The bracket is provided with an arc portion curved along an outer peripheral surface of a housing of the drive device, and extends in a front-rear direction along the crawler belt from an upper end side of the arc portion, and the upper crawler belt receiver is provided. An upper arm portion and a lower arm portion extending from the lower end side of the arc portion in the front-rear direction along the crawler belt and having the lower crawler belt receiver formed therein in a U-shape. The crawler-type traveling device according to claim 1 or 2, wherein the crawler-type traveling device is configured to engage with an outer peripheral surface of a housing of the driving device. 4. The driving device according to claim 1, wherein the housing of the driving device is provided with a stopper member for restricting movement of the bracket in the axial direction of the housing.
Or the crawler-type traveling device according to 3. 5. The crawler-type traveling device according to claim 1, wherein a plurality of rolling elements are provided between an outer peripheral surface of a housing of the driving device and the bracket.