JP2000219169A - Roller device of crawler vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the clearance size between collars and a roller proper and improve durability of these members by fixing right and left collars at a constant distance. SOLUTION: A lower roller device 12 is constituted of right and left collars 13, 13 attached to a side frame 7, a roller 17 rotatably attached to respective collars 13, a support rod 24 axially perforating the roller 17, and nuts 25 for fixing both ends of the support rod 24 to the right and left collars 13, 13. Therefore, since respective collars 13 are be fixed at a constant distance by the support rod 24, the right and left collars 13, 13 can be prevented from being approached to or separated from each other. The clearance size between the collars 13 and the roller 17 is made proper to smooth the rotation of the roller 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller device for a tracked vehicle rotatably provided on a track frame for guiding a crawler belt for traveling.

[0002]

2. Description of the Related Art In general, a tracked vehicle such as a hydraulic excavator or a hydraulic crane has a lower traveling body and an upper revolving body that is rotatably mounted on the lower traveling body. A track frame, a sprocket and an idler provided on the left and right sides of the track frame so as to be separated from each other in front and behind, a crawler belt for traveling mounted between the sprocket and the idler, the sprocket and the idler; And a plurality of roller devices provided on the track frame and guiding the crawler belt.

[0003] As a roller device of a tracked vehicle according to the prior art, a collar provided on a track frame facing left and right, and both ends are rotatably supported by the left and right collars. There is known a device constituted by rollers (for example, Japanese Utility Model Laid-Open No. 4-118888).

[0004]

The roller device according to the prior art described above merely supports the rollers by the left and right collars provided on the track frame so as to sandwich the rollers. For this reason, when the track frame is bent due to a load applied during work, running, or the like, the left and right collars attached to the track frame approach each other depending on the deformation of the track frame. Or separate.

As a result, there is a problem that the collar and the roller are displaced to cause a partial contact at a sliding contact portion, and that these members are abnormally worn and their life is shortened.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to fix the left and right collars at fixed intervals in the left and right directions, thereby forming a color and a roller. It is an object of the present invention to provide a roller device for a tracked vehicle in which a clearance dimension between the members can be made appropriate and the durability of these members can be improved.

[0007]

In order to solve the above-mentioned problem, a roller device of a tracked vehicle employed in the invention of claim 1 is opposed to a track frame of the tracked vehicle in left and right directions. And a roller that is rotatably supported at both ends by the left and right collars and guides the crawler belt for traveling in the circumferential direction, and is provided so as to penetrate the roller in the axial direction. A support rod protruding to the outside in the axial direction from the left and right collars, and a fixing member provided at both ends in the axial direction of the support rod and fixing the left and right collars to the support rod in the axial direction. Do it.

With this configuration, even when the track frame is bent, the left and right collars are fixed to both ends in the axial direction of the support rod by the fixing members. The sliding contact portion with the roller can be maintained at an appropriate gap size, and the roller can rotate smoothly.

A second aspect of the present invention is that a floating seal is provided at the end face where the left and right collars and the roller meet. Thus, it is possible to prevent the lubricating oil in the roller device from leaking to the outside, and to prevent external dust from entering the roller device.

According to the third aspect of the present invention, the collar has a cylindrical portion provided at both ends of the roller and rotatably fitted therein, and a shaft center provided on one axial side of the cylindrical portion. A bottom plate having a shaft hole at a position, and a seal receiving portion provided with an enlarged diameter on the other side in the axial direction of the cylindrical portion, and an inner bottom surface of the bottom plate is provided between a shaft end surface of a roller. A radial oil groove for storing lubricating oil for lubrication is provided, and an axial oil groove for storing lubricating oil for lubricating between an inner peripheral surface of the cylindrical portion and a peripheral surface of a roller is provided. It is in.

With this configuration, when the roller rotates with respect to the collar, the lubricating oil accumulated in the radial oil groove is supplied between the inner bottom surface of the bottom plate and the end surface of the roller shaft. Since the lubricating oil accumulated in the directional oil groove is supplied between the inner peripheral surface of the cylindrical portion and the peripheral surface of the shaft of the roller, these sliding portions can be stably lubricated.

According to the fourth aspect of the present invention, the collar has a cylindrical portion fitted on both sides in the axial direction of the support rod, a bottom plate for closing an opening of the cylindrical portion, and a shaft end of the support rod provided on the bottom plate. The support rod is formed in a cylindrical body with a bottom through a shaft hole, and a contact step is provided at both ends in the axial direction of the support rod with which the bottom plate of the collar abuts. It comprises a male screw provided at an end and a nut screwed to the male screw and holding the bottom plate of the collar between the contact step and the male screw.

[0013] With this configuration, the left and right collars are attached from both sides with the support rod penetrating the roller, and a nut is screwed onto the male screw of the support rod protruding from the bottom plate of the collar. Thereby, the roller device in which the positions of the left and right collars are fixed can be assembled. Then, by holding the bottom plate of the collar between the contact step of the support rod and the nut, the step restricts the approach of each collar, and the nut regulates the separation of each collar.

According to a fifth aspect of the present invention, on the inner peripheral side of the roller,
An oil sump chamber is provided between the support rod and
An oil passage groove extending in the axial direction from the oil reservoir is provided.

With this configuration, the lubricating oil filled in the oil reservoir flows in the axial direction through the oil passage groove, so that the lubricating oil lubricates a sliding portion between the collar and the roller. can do.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example in which a roller device of a tracked vehicle according to an embodiment of the present invention is applied to a lower roller device of a hydraulic shovel will be described in detail with reference to FIGS. .

1 is a hydraulic shovel as a tracked vehicle,
The excavator 1 includes a lower traveling body 2 and the lower traveling body 2.
An upper revolving structure 3 is mounted on the upper revolving structure 3 so as to be capable of revolving. A working device 4 for performing excavation work or the like is provided at the front of the upper revolving structure 3 so as to be able to move up and down.

Reference numeral 5 denotes a track frame constituting the lower traveling body 2, and the track frame 5 is a center frame 6
Are disposed on both the left and right sides of the center frame 6,
It has a pair of side frames 7 (only one is shown) extending rearward. A sprocket 8 serving as a driving wheel is provided at one end of the side frame 7, and an idler 9 serving as a driven wheel is provided at the other end.

As shown in FIG. 2, the side frame 7 includes left and right side plates 7A and 7B, and the side plates 7A and 7B.
An upper plate portion 7C which connects the upper ends of 7B in the left and right directions, and is inclined downward toward the outside in the left and right directions, and each side plate portion 7A,
It is formed as an inverted U-shaped hollow rectangular frame from lower plates 7D, 7D provided at the lower end of 7B.

Reference numeral 10 denotes a traveling crawler belt mounted between the sprocket 8 and the idler 9. The crawler belt 10 is driven by rotation of the sprocket 8 to drive the idler 9 and upper roller devices 11, which will be described later. Each lower roller device 12
The lower traveling body 2 is driven by orbital driving on the upper side.

11, 11 are upper plate portions 7 of the side frame 7.
Each of the upper roller devices 11 supports the crawler belt 10 from below, thereby preventing the crawler belt 10 from coming into contact with the side frame 7.

Reference numerals 12, 12,... Denote a plurality of lower roller devices provided on the lower surface side of the side frame 7. Each of the lower roller devices 12 is arranged between the sprocket 8 and the idler 9. I have. The lower roller device 12 includes a collar 13, a roller 17, a support rod 24, and a nut 2, which will be described later.
5 and the like.

13, 13 are lower plate portions 7 of the side frame 7.
D and 7D are left and right collars attached by bolts 14, and each of the collars 13 is, as shown in FIGS.
A cylindrical portion 13A formed of a cylindrical body, a bearing hole 13B formed on the inner surface of the cylindrical portion 13A, a bottom plate 13C that closes an opening on one side of the bearing hole 13B, and a bottom plate 13C formed at an axial center position of the bottom plate 13C. The shaft hole 13D forms a bottomed cylindrical body. Further, a bearing hole 1 is provided at the other end of the cylindrical portion 13A serving as the abutting end surface.
The seal receiving portion 13E is formed by expanding the diameter of 3B. Further, a bracket 13F,
13F are integrally provided, and a bolt insertion hole 13G into which the bolt 14 is inserted is formed in each bracket portion 13F.
It is formed downward. And left and right color 1
Reference numerals 3 and 13 are arranged such that the seal receiving portions 13E face each other in the left and right directions.

Reference numerals 15 and 15 denote radial oil grooves provided on the inner bottom surface of the bottom plate 13C of the collar 13. Each of the radial oil grooves 15 is
The bottom plate 13C is provided to extend radially downward from near the center of the bottom plate 13C. The radial oil groove 15 is supplied with lubricating oil from an oil sump chamber 21 described later, so that the bottom plate 13C
Has a function of supplying lubricating oil between the inner bottom surface of the roller 17 and the end surface 19A of the shaft portion 19 of the roller 17.

Reference numerals 16 and 16 denote axial oil grooves provided on the inner peripheral surface of the cylindrical portion 13A of the collar 13. Each of the axial oil grooves 16 is
The bearing hole 13B extends in the axial direction below the bearing hole 13B. The axial oil groove 16 is formed between the inner peripheral surface of the cylindrical portion 13 </ b> A and the outer peripheral surface of the shaft portion 19 of the roller 17 by supplying lubricating oil from the oil reservoir 21 through the radial oil groove 15. It has the function of supplying lubricating oil in between.

Reference numeral 17 denotes a roller disposed between the left and right collars 13, 13. The roller 17 is generally constituted by a roller body 18, a shaft 19, a rod insertion hole 20, and the like, which will be described later.

Reference numeral 18 denotes a roller main body which forms a main body of the roller 17, and as shown in FIG. 5, the roller main body 18 has a left-right symmetric stepped cylinder having large-diameter portions 18B, 18B with a central small-diameter portion 18A interposed therebetween. It is formed in a shape. In addition, each large diameter portion 1
A flange 18C is provided on the outer periphery of both left and right ends of 8B so as to protrude outward in the radial direction. The flange 18C regulates the lateral displacement of the crawler belt 10. Further, the roller body 18 has a concave annular seal receiving portion 18D, 18D on the abutting end face located on the inner peripheral side of the flange portion 18C, 18C, respectively.
Is provided.

Reference numerals 19, 19 denote shaft portions extending coaxially in the longitudinal direction (axial direction) from both ends in the axial direction of the roller body 18, and each of the shaft portions 19 is provided in a bearing hole 13B of the left and right collars 13. It is rotatably inserted.

Reference numeral 20 denotes a rod insertion hole provided through the center of the roller 17 in the axial direction.
By expanding the diameter of the intermediate portion in the axial direction, an annular oil storage chamber 21 for storing the lubricating oil is formed. In the rod insertion hole 20, oil passage grooves 22, 22, 22, 22 extending in the axial direction from the oil sump chamber 21 and having the tip reaching the end face 19 </ b> A of the shaft portion 19.
Are formed, and each oil passage groove 22 forms a passage for supplying the lubricating oil in the oil storage chamber 21 to the oil grooves 15, 16 and the like.

Reference numerals 23, 23 denote seal receiving portions 13 of the collar 13.
E and a floating seal provided between the seal receiving portion 18 </ b> D of the roller 17.
3 is a pair of seal rings 23A, 23 slidingly contacting each other.
A, the seal ring 23A and the seal receiving portions 13E, 18
D and a pair of O-rings 23B, 23B arranged between the two O-rings. The floating seals 23 allow the rollers 17 to rotate with respect to the collar 13 by sliding the seal rings 23A with each other, and prevent leakage of lubricating oil and entry of foreign matter.

Reference numeral 24 denotes a support rod according to the present embodiment.
The support rod 24 passes through the rod insertion hole 20, and both ends in the axial direction are attached to the collar 13. here,
The two ends of the support rod 24 are provided with the collar 1 as shown in FIG.
The contact step 24A comes into contact with the bottom plate 13C of No. 3 and projects axially from the contact step 24A to form a shaft end 24B. Further, a male screw 24C which forms a fixing member 27 together with a nut 25 described later is formed in the shaft end 24B. The support rod 24 has its shaft end 24B.
Is inserted through a shaft hole 13D formed in the bottom plate 13C of the collar 13, and a nut 25 is screwed into the male screw 24C.

Here, the length of the support rod 24 will be described. The length L1 between the abutting steps 24A is
The length of the roller 17 is set slightly longer than the length L2 (shown in FIG. 5), for example, about 0.2 to 1.0 mm. Thereby, the bottom plate 1 of the collar 13
A gap is always formed between 3 </ b> C and the end face 19 </ b> A of the shaft portion 19 to allow the rotation of the roller 17.

Numeral 25 designates a nut which forms a fixing member 27 together with the external thread 24C of the support rod 24.
By being screwed to the male screw 24C via the washer 26, the bottom plate 1 is held between the support rod 24 and the contact step 24A.
3C is held and fixed.

Reference numeral 27 denotes a fixing member applied to the present embodiment. The fixing member 27 includes the male screw 24C of the support rod 24, the nut 25, the washer 26, and the like.

The lower roller device 12 according to the present embodiment
Has a configuration as described above. When the crawler belt 10 is driven to rotate, the roller 17 rotates and the roller 17 rotates.
The crawler belt 10 is guided in the circumferential direction by each of the flange portions 18C.

At this time, the lubricating oil in the oil sump chamber 21 passes through the respective oil passage grooves 22 and
5. The oil is supplied to the axial oil groove 16. As a result, the lubricating oil supplied to the radial oil groove 15 forms an oil film between the end surface 19A of the shaft portion 19 and the inner bottom surface of the bottom plate 13C of the collar 13 by the rotation of the roller 17, and the radial oil groove The lubricating oil supplied to the axial oil groove 16 through the shaft 15 forms an oil film between the outer peripheral surface of the shaft portion 19 and the bearing hole 13 </ b> B of the collar 13, so that the roller 17 smoothly rotates with respect to the collar 13. can do.

Abutment step portions 24A are formed at both ends in the axial direction of the support rod 24, and the bottom plate 13C of the collar 13 is sandwiched between the contact step portion 24A and the nut 25. The left and right collars 13 are fixed at fixed intervals in the axial direction by a fixing member 27 including a washer 26 and a washer 26.

Accordingly, even if the side frame 7 is bent by the load during running or working, the collar 1
The gap in the radial and axial directions between the roller 3 and the shaft portion 19 of the roller 17 can be maintained at an appropriate value.
Galling between 3C and the end face 19A of the shaft portion 19, and one-sided contact of the shaft portion 19 with the bearing hole 13B of the collar 13 can be prevented.

Thus, according to the present embodiment, the support rods 24 are provided between the left and right collars 13, and the collars 13 are fixed at fixed intervals by the fixing members 27. 13 can be prevented from approaching or separating from each other. Thereby, color 1
Since the oil film can always be formed by properly adjusting the gap between the bearing hole 13B of the third roller 3 and the shaft portion 19 of the roller 17, the galling and abnormal wear can be prevented, and the durability of the collar 13 and the roller 17 can be improved. Can be improved.

In addition, since the gap between the seal rings 23A of the floating seal 23 can be properly maintained, the life of the floating seal 23 can be extended, and oil leakage and the like can be prevented for a long time.

Each contact step 24A of the support rod 24
Since the distance L1 between the rollers 13 is set to be slightly larger than the length L2 of the roller 17, when the lower roller device 12 is assembled, the bottom plate 13C of the collar 13 and the roller 17 (the shaft portion 19). ) Can optimize the gap size with the end face 19A, and can eliminate adjustment work and the like, thereby improving productivity.

Further, by connecting the left and right collars 13, 13 with the support rods 24 and the nuts 25, the strength of the side frame 7 can be increased, so that the deformation of the side frame 7 itself can be suppressed. .

On the other hand, by providing the collar 13 with the radial oil groove 15 and the axial oil groove 16, the roller can be smoothly rotated with respect to the collar 13. The durability can be improved, and the reliability of the lower roller device 12 can be improved.

Further, the oil reservoir 2 is provided on the inner peripheral side of the roller 17.
1 and the oil passage groove 22, the lubricating oil can be efficiently supplied to the oil grooves 15, 16 and the rotation of the roller 17 can be further smoothened.

In the embodiment, the fixing member 27 is
Male screws 24C provided on both ends of the support rod 24,
Although the case where the nut 25 and the washer 26 are screwed to the male screw 24C has been described as an example,
The present invention is not limited to this. For example, the fixing member may be configured by female screws provided on both ends of the support rod 24 and bolts screwed to the female screws.

Further, in the embodiment, the lower roller device 12 is exemplified as the roller device, but the present invention is not limited to this, and may be applied to the upper roller device 11.

Further, in the embodiment, the excavator 1 has been described as an example of a tracked vehicle, but the present invention is not limited to this, and is widely applied to a tracked vehicle such as a hydraulic crane and a bulldozer. Can be applied.

[0048]

As described in detail above, according to the first aspect of the present invention, a support rod is provided through the roller in the axial direction, and both ends of the support rod are fixed to the left and right collars by fixing members. By doing so, the left color and the right color can be fixed at fixed intervals. As a result, even when the track frame undergoes bending deformation, the support rods
The left and right collars are fixed at regular intervals, and the sliding contact area between each color and the roller can be set to the appropriate clearance size, so that the roller can rotate smoothly while preventing galling and abnormal wear. As a result, the durability of the roller device can be improved.

According to the second aspect of the present invention, since the floating seal is provided on the end face of the abutment between the left and right collars and the roller, it is possible to prevent the lubricating oil in the roller device from leaking outside. Further, it is possible to prevent external dust from entering the roller device.

According to the third aspect of the present invention, a radial oil groove for storing a lubricating oil for lubricating the gap between the shaft and the end of the roller is provided on the inner bottom surface of the bottom plate of the collar. An axial oil groove for storing lubricating oil for lubricating between the roller shaft and the peripheral surface is provided, so that when the roller rotates relative to the collar, the radial oil groove transfers the lubricating oil to the inner bottom surface of the bottom plate. And the axial oil groove can supply lubricating oil between the inner peripheral surface of the cylindrical portion and the peripheral surface of the roller shaft. The sliding part can be stably lubricated, and the operation performance and durability can be improved.

According to the fourth aspect of the present invention, a contact step is provided at both ends in the axial direction of the support rod with which the bottom plate of the collar contacts.
A male screw provided at the shaft end of the support rod with the fixing member,
A nut that is screwed to the male screw and clamps the bottom plate of the collar with the abutting step. This allows
The left and right collars are attached from both sides with the support rod penetrating the roller, and nuts are screwed onto male screws of the support rod protruding from the bottom plate of the collar, so that the left and right collars are screwed.
A roller device in which the position of the right collar is fixed can be assembled. And, by holding the bottom plate of the collar between the contact step of the support rod and the nut, the step restricts the approach of each collar, and the nut regulates the separation of each collar, so that galling and abnormal wear can occur. And the roller can be smoothly rotated.

According to the fifth aspect of the invention, an oil reservoir is provided on the inner peripheral side of the roller between the roller and the support rod, and an oil passage groove extending in the axial direction from the oil reservoir is provided. As a result, the lubricating oil filled in the oil sump chamber can flow in the axial direction through the oil passage groove, and the lubricating oil lubricates the sliding portion between the collar and the roller to smoothly rotate the roller. Can be

[Brief description of the drawings]

FIG. 1 is a front view of a hydraulic shovel including a lower roller device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a side frame and a lower roller device as viewed from the direction of arrows II-II in FIG.

FIG. 3 is an enlarged vertical sectional view showing a lower roller device.

FIG. 4 is an enlarged cross-sectional view showing the lower roller device in FIG. 3 in an enlarged manner from an arrow IV-IV direction.

FIG. 5 is a longitudinal sectional view showing the roller in FIG. 3 alone;

FIG. 6 is a front view showing the support rod in FIG. 3 alone;

[Explanation of symbols]

 Reference Signs List 1 hydraulic excavator (tracked vehicle) 5 track frame 10 crawler belt 12 lower roller device 13 collar 13A cylindrical portion 13B bearing hole 13C bottom plate 13D shaft hole 13E seal receiving portion 15 radial oil groove 16 axial oil groove 17 roller 18 roller Body 19 Shaft 19A End face 21 Oil reservoir 22 Oil passage 23 Floating seal 24 Support rod 24A Contact step 24B Shaft end 24C Male screw 25 Nut 27 Fixing member

Claims (5)

[Claims] 1. A collar provided on a track frame of a tracked vehicle so as to oppose left and right directions, and both ends are rotatably supported by the left and right collars, and a traveling crawler belt is provided in a circumferential direction. A roller to be guided, a support rod provided through the roller in the axial direction, both ends protruding axially outside the left and right collars, and a support rod provided at both ends in the axial direction of the support rod; A roller device for a tracked vehicle comprising a fixing member for fixing the left and right collars to a support rod in an axial direction. 2. The roller device for a tracked vehicle according to claim 1, wherein a floating seal is provided on an abutting end face between the left and right collars and the roller. 3. The collar has a cylindrical portion provided at both ends of the roller and rotatably fitted with a shaft portion, and a shaft hole provided at one axial side of the cylindrical portion at a shaft center position. And a seal receiving portion provided with an enlarged diameter on the other side in the axial direction of the cylindrical portion, and an inner bottom surface of the bottom plate for lubricating between the shaft end surface of the roller. A radial oil groove for storing lubricating oil is provided, and an axial oil groove for storing lubricating oil for lubricating between the inner peripheral surface of the cylindrical portion and the shaft peripheral surface of the roller is provided. 3. The roller device for a tracked vehicle according to 1 or 2. 4. The collar has a cylindrical portion fitted on both sides in the axial direction of the support rod, a bottom plate closing an opening of the cylindrical portion, and a shaft end of the support rod provided on the bottom plate being inserted therethrough. The support rod is formed in a cylindrical body with a bottom, and a contact step portion with which the bottom plate of the collar abuts is provided on both ends in the axial direction of the support rod, and the fixing member is a shaft end of the support rod. The roller for a tracked vehicle according to claim 1 or 2, comprising: a male screw provided on the vehicle; and a nut screwed to the male screw and holding the bottom plate of the collar between the contact step. apparatus. 5. An oil reservoir which is located between the roller and the support rod and is provided with an oil passage extending in the axial direction from the oil reservoir on an inner peripheral side of the roller. The roller device for a tracked vehicle according to 1, 2, 3, or 4.