JPH09268600A - Adjusting method and structure of backlash in construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the backlash between the first gear of a rotary body side and the second gear of a frame base side, in a construction machine supporting the rotary body on the frame base so as to be freely rotatable. SOLUTION: An eccentric actuation pin 15 is rotated around the axis and a flange 13a is transferred against a rotary table 10, in a temporarily fixed condition of the flange 13a to the rotary table 10 when the fitting flange 13a of a pinion gear (the first gear) is fixed to the rotary table 10. In this way, the backlash between the pinion gear 12 and the ring gear (second gear) is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of construction machines such as hydraulic excavators used for various construction works and civil works.

[0002]

2. Description of the Related Art Generally, some construction machines of this type have an upper revolving structure rotatably supported above a lower traveling structure via a revolving device, such as a hydraulic excavator. The device is fixed to the undercarriage,
A ring gear having inner teeth on the inner peripheral surface portion and inner races formed on the outer peripheral surface portion, an outer race fixed to the upper revolving body and rotatably fitted on the inner race,
A pinion gear rotatably supported by a mounting member fixed to the outer race side and meshing with the ring gear;
There is one constituted by a member such as a turning drive motor for rotating the pinion gear forward and backward. In such a case, it is necessary to assemble the ring gear and the pinion gear that mesh with each other so that the backlash between both gears becomes a specified value. The mounting position and the mounting position of the pinion gear mounting member on the outer race side are obtained by backlash calculation, and it is required to mount the ring gear and pinion gear mounting member on the calculated portion.

[0003]

However, in the above-mentioned prior art, when the mounting member is mounted on the outer race side, a bolt which is inserted from the mounting member side and screwed into the outer race side is used. In this case, however, the mounting member is mounted. The round holes (through holes) for bolts formed on the side must be stupid holes having a larger diameter than the bolts. For this reason, even if the mounting member is mounted at the calculated position, the tolerance of the stupid hole may cause a mounting error, and thus the backlash between the gears may not be the specified value.
In such a case, smooth turning is impaired, and
There is a problem such as generation of abnormal noise, which is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems. It is possible to freely rotate a revolving structure on a frame via a revolving device. The first gear, which is rotatably supported by a mounting member fixed to the revolving structure side and is interlockingly connected to a revolving drive motor, and which is fixed to the gantry side. In the construction machine configured to rotate the revolving structure with respect to the pedestal by using a second gear that meshes with the driving force of the revolving drive motor,
In adjusting the backlash between the second gears, the mounting member is temporarily fixed to the revolving structure in a position adjustable state, and the mounting member is moved in the temporarily fixed state to adjust the backlash between both gears. After that, the mounting member is fixed to the revolving structure side. Further, in this structure, a flange portion for fixing the mounting member to the mounting surface portion on the revolving structure side is formed, and the backlash adjustment in the temporarily fixed state of the mounting member is performed by rotating the flange around the axis. A backlash adjustment is performed by inserting an operating pin having an operating portion for moving the mounting portion relative to the mounting surface portion into the flange portion and the mounting surface portion, and moving the flange portion in accordance with the rotation of the operating pin in the axial direction. Is configured to do. The present invention also provides
A first gear that rotatably supports a revolving structure on a pedestal via a revolving device, the revolving device is rotatably supported by a mounting member fixed to the revolving structure, and is interlocked with a revolving drive motor. A work machine constituted by using a second gear fixed to the gantry side and meshing with the first gear, and configured to swivel the swivel body with respect to the gantry by obtaining a driving force of a swiveling drive motor. When adjusting the backlash between the first and second gears, a flange portion formed on the mounting member for fixing the mounting member to the mounting surface portion on the revolving structure side, and an operating pin inserted through the flange portion and the mounting surface portion. The actuating pin is formed with an actuating portion for adjusting the backlash by moving the flange portion with respect to the mounting surface portion by the rotation of the actuating pin in the axial direction. . And by doing this,
When mounting the flange part of the mounting member on which the first gear is supported on the mounting surface part on the revolving structure side, with the flange part temporarily fixed to the mounting surface part so that the position can be adjusted, the operating pin with the operating part By rotating the gear in the direction, the flange portion moves with respect to the mounting surface portion, whereby the backlash between the two gears can be adjusted, and the backlash can be managed with high accuracy.
In this structure, the actuating pin is an eccentric pin whose eccentricity is such that the axial center of the portion to be inserted into the flange portion is eccentric with respect to the axial center of the portion to be inserted into the mounting surface portion. The flange portion can be moved with respect to the mounting member by rotating. Further, by interposing a spacer for adjusting the position of the first gear with respect to the second gear in the axial direction between the flange portion and the mounting surface portion, the axial adjustment can be easily performed. This is a ring gear in which the second gear has inner teeth that mesh with the first gear formed on the inner peripheral surface portion and the inner race of the slewing bearing is formed on the outer peripheral surface portion. The mounting surface portion to which the flange portion is mounted is fixed to the revolving structure, and is integrally provided on the outer race rotatably fitted to the inner race, and the first and second driving units are driven by the revolving drive motor. The present invention can be applied to a construction machine configured such that a revolving structure revolves with respect to a gantry by revolving the inner peripheral surface portion of the second gear while one gear rotates.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a hydraulic excavator, and the hydraulic excavator 1 is a crawler-type lower traveling body 2 and an upper swinging structure which is supported above the lower traveling body 2 via a swinging device 3 described later so as to be freely rotatable. As in the prior art, the body 4 and the front attachment 5 attached to the front portion of the upper swing body 4 are constituted.

Reference numeral 6 denotes a ring gear (corresponding to the second gear of the present invention) which constitutes the turning device 3, and the ring gear 6 is integrally attached to the upper end portion of the lower traveling body 2. However, inner teeth 6a are formed on the inner peripheral surface of the ring gear 6, and inner races 6b are formed on the outer peripheral surface.

On the other hand, 7 is an outer race integrally attached to the lower end of the upper revolving structure 4, and the outer race 7 is provided with a ball bearing 8 on the inner race 6b.
It is rotatably fitted to the outside via the inner race 6b and constitutes a slewing bearing 9. Further, a disc-shaped turning table 10 is integrally fixed to the upper end portion of the outer race 7.

Reference numeral 11 is a swing drive motor, and the drive force of the swing drive motor 11 is reduced by a reduction gear (not shown) in a pinion gear (corresponding to the first gear of the present invention). Output) to 12
The pinion gear 12 meshes with the inner teeth 6a of the ring gear 6, and the pinion gear 12 revolves around the inner peripheral surface portion of the ring gear 6 while rotating on the basis of forward and reverse driving of the turning drive motor 11. Thus, the upper revolving structure 4 revolves with respect to the lower traveling structure 2.

Further, 13 is the turning drive motor 11,
A mounting member is attached to the turning table 10 below the mounting member 13, which is a mounting member that is rotatably supported while the reduction gear is assembled and the pinion gear 12 projects downward. Flange part 1 for
3a is formed, the present invention is applied to the attachment of the flange portion 13a to the revolving table 10.

That is, a plurality of bolt round holes 13b into which the fixing bolts 14 are inserted in a loose fitting manner, and an actuating pin 15 to be described later are inserted into the flange portion 13a with appropriate intervals in the circumferential direction. And a pin insertion hole 13c for the pin.

Reference numeral 16 is a ring-shaped mounting seat integrally fixed to the upper surface of the revolving table 10 by welding or the like.
Bolt screw holes 16b and 10b into which the fixing bolt 14 is screwed into the flange portion 13a at portions corresponding to the bolt round hole 13b and the pin insertion hole 13c, and the operating pin 1.
Screw holes 16c and 10c for pins into which 5 is screwed are respectively drilled, and gear through holes 16d and 10d through which the pinion gear 12 penetrates in a loosely fitted manner are provided.

Further, 17 is a ring-shaped spacer interposed between the upper surface portion of the mounting seat 16 and the lower surface portion of the flange portion 13a, and the mounting member 13 is provided on the inner peripheral surface portion of the spacer 17. The cylindrical portion 13d formed in the lower part of the is fitted in the spigot, whereby the spacer 17 is integrated with the mounting member 13, which is located in the axial direction of the pinion gear 12 and the ring gear 6. The spacer 17 is for adjustment, and therefore the thickness for adjusting the position is selected and may not be necessary. However, the spacer 17 has a round hole 13 for the bolt of the flange portion 13a.
b, a round hole 17b for bolts having the same diameter as the pin insertion hole 13c,
The pin insertion holes 17c are provided at corresponding portions.

On the other hand, the operating pin 15 has first and second screw portions 15a and 15b formed on both axial side portions thereof, and a cylindrical portion (corresponding to an operating portion of the present invention) 15c at a central portion in the axial direction. Is formed, and the first screw portion 1
5a is screwed into the mounting seat 16 and the pin screw holes 16c and 10c of the turning table 10, and the cylindrical portion 15c has a gap between the lower half of the pin insertion hole 13c of the flange portion 13a and the pin insertion hole 17c of the spacer 17. Are fitted together, and the upper end of the second screw portion 15b is the flange portion 13a.
It is set so as to be loosely inserted into the upper half of the pin insertion hole 13c of the flange portion 13 while protruding from the upper surface of the cylindrical portion 15c. First, the distance D with respect to the axis B of the second screw portions 15a and 15b
It is formed on an eccentric pin that is eccentric only. Further, the actuating pin 15 has a chamfered portion 15d for rotating the actuating pin 15 in the axial direction at the upper end of the second screw portion 15b protruding from the upper surface of the flange portion 13a.

Then, the mounting member 13 is attached to the turning table 1
The spacer 1 is attached to the attachment member 13 when attaching it to 0.
7 with the mounting seat 16 integrally attached to the revolving table 10, the fixing bolt 14 and the operating pin 1
5, the flange portion 13a, the round holes 13b and 17b for bolts of the spacer 17 and the insertion holes 13c and 17c for pins, respectively.
From the mounting seat 16, the screw holes 16b and 10b for bolts of the turntable 10 and the screw holes 16c and 10 for pins.
It is screwed into c and lightly tightened to temporarily fix the flange portion 13a to the turning table 10. In this state, when the actuating pin 15 is rotated around the axis, the actuating pin 15 which is eccentric as described above has the cylindrical portion 15c fitted to the flange portion 13a side with no gap. The axis A is the turning table 1
The axis B of the first screw portion 15a screwed into the 0 side is revolved around the axis, and the flange portion 13 is accordingly rotated.
a moves with respect to the turning table 10. This allows
The backlash in the center direction and the tooth thickness direction between the pinion gear 12 and the ring gear 6 is adjusted to a specified value, and after adjusting the backlash, the nut 15e is screwed into the second screw portion 15b of the operating pin 15. Tighten and tighten the operating pin 15
Is fixed to the position where the backlash is adjusted, and the fixing bolt 14 in the temporarily fixed state is tightened, so that the flange portion 13a is fixed to the turning table 10. It should be noted that the movement of the flange portion 13a associated with the rotation of the actuating pin 15 in the direction around the axis causes the fixing bolt 1
4 is set so as to be absorbed by the round bolt hole 13b.

In the structure constructed as described above, the swing operation of the upper swing body 4 with respect to the lower traveling body 2 is such that the pinion gear 12 rotates on the basis of the forward and reverse drive of the swing drive motor 11, and the inner peripheral surface portion of the ring gear 6 is rotated. When the pinion gear 12 and the ring gear 6 are mounted on the revolving table 10 with the flange portion 13a of the mounting member 13 on which the pinion gear 12 is supported, as described above. , Fixing bolt 14 and operating pin 1
5 is lightly tightened to temporarily fix the flange portion 13a to the swivel table 10, and the flange portion 13a and the operating pin 15 inserted in the swivel table 10 in an eccentric state are rotated to move the flange portion 13a. The pinion gear 12 moves with respect to the ring gear 6, and thereby the backlash between both gears 12 and 6 can be adjusted.

As a result, although the backlash between the pinion gear 12 and the ring gear 6 does not reach the specified value due to tolerance, machining error, mounting error, etc. despite the backlash calculation, the pinion gear is supported. When the mounting member 13 on which the 12 is supported is mounted on the swivel table 10, the backlash between the gears 12 and 6 can be adjusted to a predetermined value, and the backlash can be managed with high accuracy. As a result, it is possible to avoid the occurrence of abnormal noise due to the backlash deviating from the default value and the problem of impairing smooth turning.

Of course, the present invention is not limited to the above-mentioned first embodiment, and when the mounting member is moved in the temporarily fixed state to adjust the backlash, the second embodiment shown in FIGS. However, in the second embodiment, the same parts as those in the first embodiment (the same things) are designated by the same reference numerals and their details will be described. Is omitted.

In the second embodiment, the flange portion 13a has a plurality of bolt round holes 13b similar to those of the first embodiment, as well as a shaft support pin through which a shaft support pin 18 is inserted. An insertion hole 13e and a second pin insertion hole 13f into which a second operation pin 19 described later is inserted are formed.

On the other hand, the turning table 10 and the mounting seat 1
Reference numeral 6 denotes a bolt screw hole 10 similar to that of the first embodiment.
b, 16b, gear through holes 10d, 16d, the shaft support pin insertion hole 10e, at a portion corresponding to the shaft support pin insertion hole 13e and the second operation pin insertion hole 13f of the flange portion 13a, 16e, second operating pin insertion holes 10f, 16
f are drilled respectively.

Further, in the spacer 17, in addition to the bolt round hole 17b similar to the first embodiment, the shaft support pin insertion hole 17e and the second actuation pin insertion hole 17f are formed at the corresponding positions. It is set up.

Further, in the second operation pin 19, the axis A of the first insertion portion 19a, which is inserted into the second operation pin insertion hole 13f of the flange portion 13a, has the axis A of the rotation table 10 and the attachment seat 16. The eccentric pin is eccentric by a distance E with respect to the axis B of the second insertion portion 19b that is inserted into the insertion holes 10f and 16f.

In the second embodiment, when the mounting member flange portion 13a is mounted on the swivel table 10, the spacer 17 is integrally mounted on the mounting member 13 and the mounting seat 16 is integrally mounted on the swivel table 10. Then, the shaft support pin 18 is inserted through the flange portion 13a, the spacer 17, the mounting seat 16, and the shaft support pin insertion holes 13e, 17e, 16e, 10e of the turning table 10,
The flange portion 13a is temporarily fixed to the turning table 10. In this state, insert the second operating pin 19 into the second operating pin insertion hole 1
3f, 17f, 16f, 10f, and then the second operating pin 19 is rotated in the axial direction, the second operating pin 19 which is eccentric as described above is Arrow P with the axis B of the second insertion portion 19b as the axis
In this case, the flange portion 13a swings about the shaft support pin 18 as a supporting shaft, whereby the pinion gear 12 moves with respect to the ring gear 6 and both gears 12, It is set to adjust the backlash between six. After adjusting the backlash, the fixing bolt 14 is inserted into the round holes 13b and 17b for bolts and the screw holes 16b and 10b for bolts and tightened, so that the flange portion 13a is fixed to the turning table 10. There is. Here, the shaft support pin 18 is positioned at an angle of approximately 90 degrees with respect to the meshing position C of the pinion gear 12 with the ring gear 6 in the direction around the axis F of the pinion gear 12, and the second position. The actuating pin 19 is approximately 9 times in the direction around the axis E of the pinion gear 12 with respect to the pivot pin 18.
The position is set so as to have an angle of 0 degree (note that in the present embodiment, the second operation pin 19 is displaced by 180 degrees with respect to the meshing position C as shown in the figure). However, it may be set to 0 degree, that is, the meshing position). Further, the second operation pin insertion holes 10f and 16 formed in the turning table 10 and the mounting seat 16 are formed.
f is set so that the second operation pin second insertion portion 19b is inserted without play, but the mounting member flange portion 1
The second operation pin insertion hole 13f formed in 3a is a long hole extending in the direction of a straight line L connecting the shaft support pin 18 and the shaft core B of the second insertion portion 19b. When the second operation pin 19 is rotated, there is no play in the movement of the second operation pin first insertion portion 19a of the component in the swinging direction of the mounting member 13 with the shaft support pin 18 as the axis. Mounting member 1
3 is urged to move, but the movement of the first insertion portion 19a of the component in the direction of the straight line L is set so as to be absorbed by the play in the long hole. In addition, in FIG. 11, in order to make the explanation easy to understand, the elongated hole is made longer to exaggerate the eccentric amount E (the distance between the axis A of the first insertion portion 19a and the axis B of the second insertion portion 19b). There is. Further, the second operation pin 19 is formed with a third insertion part 19c which is inserted into the second operation pin insertion hole 17f of the spacer 17, and the third insertion part 19c is formed.
Has an oval shape corresponding to the hole shape of the second operation pin insertion hole 13f formed on the flange portion 13a side,
As a result, the second operating pin 19 can be incorporated into the insertion hole 13f so as to penetrate therethrough.

In the second embodiment constructed as described above, the pinion gear 12 and the ring gear 6 are the flange portion 1 of the mounting member 13 on which the pinion gear 12 is supported.
When attaching 3a to the revolving table 10, the flange portion 1
The second operating pin 1 is eccentrically inserted into the flange portion 13a and the turning table 10 in a temporarily fixed state in which 3a is swingably supported on the turning table 10 via the shaft supporting pin 18.
Backlash adjustment can be performed by rotating 9 to swing the flange 13a around the shaft support pin 18 as a support shaft, and the same effect as that of the first embodiment is obtained.

Moreover, in the second embodiment, the pivot pin 18 that pivotally supports the flange portion 13a on the revolving table 10 has the pinion gear 12 with respect to the meshing position C between the pinion gear 12 and the ring gear 6. 12 are arranged at an angle of about 90 degrees around the axis of the shaft 12, and the flange portion 1
The second operating pin 19 for swinging 3a is arranged at an angle of about 90 degrees with respect to the shaft support pin 18 in the direction around the shaft center. The rotation in the circumferential direction causes the flange portion 13a to swing in a direction substantially along a radial line connecting the centers of the gears 12 and 6, which is advantageous in that backlash adjustment can be easily performed.

Further, as shown in FIG. 12, the second operating pin 19 in the second embodiment is replaced with the second insertion portion 19 as shown in FIG.
A screw groove 19d is engraved in the lower part of b, and after adjusting the backlash or after tightening the fixing bolt 14, a nut 19e is screwed and tightened into the screw groove 19d to fix the second operating pin 19. However, in this case, the second operating pin 19 may be attached to the flange portion 1
There is an advantage that it can be used also as a fixing member of 3a and the turntable 10. Further, in the second embodiment, the fixing of the flange portion 13a and the turntable 10 is not limited to the fixing bolt 14, but may be fixed by welding or the like.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator.

FIG. 2 is a cross-sectional view of a turning device.

FIG. 3 is a side view showing a mounting state of a mounting member.

FIG. 4 is a plan view showing a mounting state of a mounting member.

5 (X) and (Y) are sectional views taken along line XX in FIG. 4 and YY.
It is sectional drawing.

6 (X) and (Y) are a side view and a plan view of the operating pin.

7 (X) and (Y) are a plan view of a mounting seat and a side view showing a state in which the mounting seat is mounted on a turning table.

8 (X) and (Y) are a plan view and a side view of a spacer.

FIG. 9 is a plan view showing a mounting state of a mounting member according to a second embodiment.

10 (X) and (Y) are sectional views taken along line XX in FIG.
It is a Y sectional view.

FIG. 11 is an explanatory diagram showing a positional relationship between a second operation pin and a shaft support pin in the second embodiment.

FIG. 12 is a view of a second operation pin showing another embodiment.

[Explanation of symbols]

 2 Lower traveling body 3 Revolving device 4 Upper revolving structure 6 Ring gear 6a Inner teeth 6b Inner race 7 Outer race 9 Revolving bearing 11 Revolving drive motor 12 Pinion gear 13 Mounting member 13a Flange portion 15 Actuating pin 15a First screw portion 15c Cylindrical portion 17 Spacer 19 Second Operation Pin

Claims (6)

[Claims] 1. A slewing body is rotatably supported on a pedestal via a slewing device, and the slewing device is rotatably supported by a mounting member fixed to the slewing body side and is interlocked with a slewing drive motor. And a second gear that is fixed to the gantry side and meshes with the first gear, and is configured to rotate the revolving structure with respect to the gantry by obtaining the driving force of the revolving drive motor. In the construction machine, in adjusting the backlash between the first and second gears, the mounting member is temporarily fixed to the revolving structure side in a state where the position can be adjusted, and the mounting member is moved in the temporarily fixed state. A method for adjusting a backlash of a gear in a construction machine configured to fix a mounting member to a revolving structure side after adjusting a backlash between the gears. 2. The mounting member according to claim 1, wherein the mounting member is formed with a flange portion for fixing to the mounting surface portion on the revolving structure side, and the backlash adjustment in the temporarily fixed state of the mounting member is performed in the axial direction. The actuating pin formed with the actuating part for moving the flange part with respect to the mounting surface part by rotating is inserted into the flange part and the mounting surface part, and the flange part moves in accordance with the axial rotation of the actuating pin. Backlash adjustment method for gears in construction machinery configured to adjust backlash with. 3. A slewing body is rotatably supported on a pedestal through a slewing device, and the slewing device is rotatably supported by a mounting member fixed to the slewing body side and is interlocked with a slewing drive motor. And a second gear that is fixed to the gantry side and meshes with the first gear, and is configured to rotate the revolving structure with respect to the gantry by obtaining the driving force of the revolving drive motor. In the working machine, when adjusting the backlash between the first and second gears, a flange portion formed on the attachment member for fixing the attachment member to the attachment surface portion on the revolving structure side, and the flange portion and the attachment surface portion The operation pin is formed with an operation part for adjusting the backlash by moving the flange part with respect to the mounting surface part by rotating the operation pin in the axial direction. Backlash adjustment structure for gears in existing construction machinery. 4. The construction machine according to claim 3, wherein the actuating pin is an eccentric pin in which an axial center of a portion inserted into the flange portion is eccentric with respect to an axial center of a portion inserted into the mounting surface portion. Gear backlash adjustment structure. 5. The gear back in a construction machine according to claim 3, wherein a spacer for adjusting the position of the first gear in the axial direction with respect to the second gear is interposed between the flange portion and the mounting surface portion. Rush adjustment structure. 6. The second gear according to claim 3, wherein the second gear has inner teeth meshing with the first gear formed on an inner peripheral surface portion,
A ring gear having an inner race of a revolving bearing formed on the outer peripheral surface thereof, and a mounting surface portion to which a flange portion of the first gear mounting member is mounted is fixed to a revolving body and is rotatably fitted to the inner race. It is to be integrally provided in the outer race, and the revolving structure revolves with respect to the gantry by revolving the inner peripheral surface of the second gear while the first gear rotates while the revolving drive motor rotates forward and backward. Backlash adjustment structure of the gear in the construction machine configured as follows.