JPH0340771B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for assembling a swing ring in construction machinery such as a large hydraulic excavator, a crawler crane, a truck crane, etc. The present invention relates to a method for assembling a swivel wheel in which the zone is not located in a portion where a load is applied during work.

[Background of the invention]

BACKGROUND ART In recent large construction machines, such as large hydraulic excavators, a structure as shown in FIG. 3 is used as a swing wheel. This swing wheel has a swing drive gear 2 on its inner periphery, an inner ring 1 which is bolted to a lower traveling body (not shown) through a mounting hole 3, and an upper rotating body (not shown) through a mounting hole 5. upper outer ring 4 to be bolted to (not shown) and mounting hole 7
The lower outer ring 6 is bolted together with the upper outer ring 4 to the upper revolving body via. Said inner ring 1
has a main thrust race 1a, a sub-thrust race 1b and a radial race 1c formed on its outer peripheral surface, and the upper outer ring 4 has a main thrust race 4 formed on its inner peripheral surface.
a, a radial race 4b is formed, and the lower outer ring 6 has an auxiliary thrust race 6a formed on its inner peripheral surface. The main thrust roller 8 that bears the load in the gravity direction is placed between the main thrust race 1a of the inner ring 1 and the main thrust race 4a of the upper outer ring 4, and the auxiliary thrust race 1b of the inner ring 1 and the auxiliary thrust race 6a of the lower outer ring 6 are connected to each other. The radial race 1c of the inner ring 1 is connected to the secondary thrust roller 9 that bears the load in the anti-gravity direction between them.
A radial roller 10 that bears a radial load is interposed between the upper outer ring 4 and the radial race 4b of the upper outer ring 4. Furthermore, the inner race 1 and the upper and lower outer races 4 and 6 are surface hardened by progressive induction hardening in order to improve wear resistance. In this quenching, if the quenching start point and the quenching end point overlap, quenching cracks etc. will occur, so the quenching is finished before the quenching start point, that is, the quenching start point and the quenching end point overlap. A non-hardened zone (hereinafter referred to as a soft zone) is provided in between. FIG. 4 shows an example of quenching the inner ring 1, where A is the quenching start point, B is the quenching end point, and 100 is the soft zone.

Next, a hydraulic excavator using the above-mentioned swing wheel will be explained with reference to FIGS. 5 and 6. In FIG. 5, 11 is the undercarriage, and 12 is the undercarriage 1.
1 is rotatably mounted on the upper revolving body 13 via a revolving wheel 13; 14 is a working device mounted on the front center of the upper revolving body 12; and 15 is provided on the left side of the front part of the upper revolving body 12. Showing cab. In this hydraulic excavator, a lower traveling body 11 and an upper rotating body 1 are provided.
2 is referred to as the vehicle body, and in the longitudinal direction of the vehicle body, when the upper rotating body 12 is in the non-swinging position as shown in the figure, the working device 16 side is the front, and the lower traveling body 1 is the front side.
The side of the hydraulic motor 16 of No. 1 is defined as the rear side.

In the above-mentioned hydraulic excavator, when excavating with the working device 14 as shown in FIG.
3 bears the gravitational load W, radial load F, and moment M from the working device 14 and the upper revolving structure 12. Specifically, the main thrust races 1a and 4a of the swing wheels shown in FIG. 3 bear the maximum load at the front position of the vehicle body. Further, the auxiliary thrust races 1b and 6a bear the maximum load at the rear position of the vehicle body, and the radial races 1c and 4b bear the maximum load at the front position of the vehicle body. The above is the work device 14
This is an explanation of the case where a downward force acts on the bucket, but there are cases where an upward pushing force acts on the bucket. At this time, the main thrust races 1a and 4a of the swing wheels bear the maximum load at the rear position of the vehicle body, the auxiliary thrust races 1b and 6a bear the maximum load at the front position of the vehicle body, and the radial race 1
C and 4b bear the maximum load at the rear of the vehicle.

Next, as shown in FIG. 6, the upper revolving body 12 is normally turned around 90 degrees to the left to load the excavated earth and sand into the dump truck 17. The reason why the upper revolving structure 12 is turned to the left is that the cab 15 is located on the left side, and if it was turned to the right, the working device 14 would obstruct the driver's view and would be difficult to load. During this loading, the swing wheel 13 bears a load W in the direction of gravity and a moment M. That is, the main thrust races 1a and 4a of the swing wheels shown in FIG. 3 are located at the left front of the vehicle body.
Bears the maximum load within a 90° range. Further, the auxiliary thrust races 1b and 6a bear the maximum load within a range of 90 degrees to the right front of the vehicle body, and the radial races 1c and 4b do not bear a large load.

As described above, in the hydraulic excavator, the above-mentioned work cycle is performed most frequently. Therefore, if the soft zones of each race of the inner ring 1, upper outer ring 4, and lower outer ring 6 in the swing ring are arranged at positions where loads are frequently borne, there is a risk that the soft zones will wear out prematurely. Such problems occur not only in hydraulic excavators but also in crawler cranes and truck cranes.

[Purpose of the invention]

An object of the present invention is to provide a method for assembling an inner ring, an upper outer ring, and a lower outer ring without placing the soft zone of each race in the swing ring in a position that bears the maximum load during the work cycle of a construction machine. It's about doing.

[Summary of the invention]

The swing wheel assembly method of the present invention includes: (a) aligning the soft zone of the main thrust race of the inner ring on the opposite side of the cab with respect to the longitudinal center line of the vehicle passing through the center of the swing wheel;
(b) Position the soft zone of the inner ring's secondary thrust race at approximately 90° on the cab side with respect to the center line; (c) Position the soft zone of the inner ring's radial race on the cab side with respect to the center line. almost 90° position,
(d) Position the soft zone of the main thrust race of the upper outer ring at approximately 90° on the cab side with respect to the center line,
(e) The soft zone of the radial race on the upper outer ring,
A position approximately 90° on the opposite side of the cab with respect to the center line,
(f) The soft zone of the auxiliary thrust race of the lower outer ring is placed at a position approximately 90° on the opposite side of the cab from the center line, and in the frequently worked area (approximately 90° from the front of the vehicle body to the cab side). range)
In this case, the soft zones of the main thrust races, the soft zones of the secondary thrust races, and the soft zones of the radial races are arranged so that they do not overlap, so that the maximum load can be borne by the soft zone of each race. I tried to avoid it.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2, taking a swing wheel of a hydraulic excavator as an example. FIG. 1 is an explanatory diagram showing the position of the soft zone of each race on the slewing ring, and FIG. 2 is a plan view of the slewing ring illustrating the positioning of each soft zone in FIG. 1. In this embodiment, when the cab of the hydraulic excavator is provided on the front left side of the upper revolving structure 12 as shown in FIG. 5, the main thrust race 1a of the inner ring 1 is The soft zone 101 is located on the opposite side of the cab 15 with respect to the center line S in the longitudinal direction of the vehicle body passing through the center O of the turning wheel.
The soft zone 102 of the auxiliary thrust race of the inner ring 1 is placed at a position of 90°, and the soft zone 103 of the radial race of the inner ring 1 is placed at a position of 90° on the cab 15 side with respect to the center line S, as shown in FIG. , same figure c
The cab 15 side with respect to the center line S as shown in
The soft zone 104 of the main thrust race of the upper outer ring 4 is located at a 90° position, and the soft zone 104 of the radial race of the upper outer ring 4 is located at a position of 90° on the cab 15 side with respect to the center line S, as shown in FIG. 105
The soft zone 106 of the auxiliary thrust race of the lower outer ring 6 is placed at a position 90° on the opposite side of the cab 15 with respect to the center line S, as shown in figure e.
As shown in FIG.
Main thrust race comrade soft zone 101,1
04, Soft zone 10 of vice thrust race comrades
2, 106 and the soft zones 103, 105 of the radial races are arranged at positions where they do not overlap, and the turning wheel is assembled. Further, in this embodiment, the positioning of each soft zone is performed through the notch holes. To explain this using Figure 2,
The two notch holes 17a and 17b are located in the inner ring 1 at asymmetrical positions with respect to the center line S, that is, the notch holes 17b.
is provided at a position shifted by a certain angle θ ₁ from the symmetrical position of the notch hole 17a, while the lower running body is also provided with notch holes that coincide with the notch holes 17a and 17b, and by press-fitting the dowel pins into these notch holes, the inner ring 1. Position each soft zone. In addition, two notch holes 1 are provided across the upper outer ring 4 and the lower outer ring 6.
8a and 18b are located at asymmetrical positions with respect to the center line S,
In other words, while the notch hole 18b is provided at a position shifted by a certain angle θ ₂ from the symmetrical position of the notch hole 18b,
The upper revolving body is also provided with notch holes that coincide with the notch holes 18a and 18b, and by press-fitting dowel pins into these notch holes, the respective soft zones of the upper and lower outer races 4 and 6 are positioned.

Therefore, in this embodiment, the soft zone of each race in the swing wheel is assembled so as to be disposed at a position away from the part that bears the maximum load during the work cycle, so that premature wear of the soft zone can be prevented.

Furthermore, since each soft zone can be positioned through the notch holes, the positioning can be done accurately without paying special attention.

In this embodiment, the cab 15 is attached to the upper rotating body 1.
In the above description, the hydraulic excavator is provided with the cab on the left side of the front part of FIG. The same applies to crawler cranes and truck cranes.

〔Effect of the invention〕

As described above, according to the present invention, early wear of the soft zone of each race in the swing ring can be prevented, and the life of the swing ring can be extended.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is an explanatory diagram showing the position of the soft zone of each race in the swing wheel of a hydraulic excavator, and FIG.
Fig. 3 is a cross-sectional view showing the structure of the swivel ring, Fig. 4 is an explanatory view showing the state of induction hardening on the inner ring, and Fig. 5 is a plan view of the slewing ring to explain the positioning of each soft zone in the figure. FIG. 6 is a side view showing the excavating position of the hydraulic shovel, and a front view showing the loading position of the excavated earth and sand into the dump truck. 1...Inner ring, 1a...Main thrust race, 1b
...Secondary thrust race, 1c...Radial race, 4...Upper outer ring, 4a...Main thrust race, 4b...Radial race, 6...Lower outer ring,
6a... Secondary thrust race, 11... Hydraulic excavator lower running body, 12... Upper rotating body, 14...
Working device, 15... Cab, 17a, 17b, 1
8a, 18b...Knock holes, 101-106...
Non-quenched zone (soft zone).

Claims (1)

[Claims] 1. The vehicle body is composed of a lower traveling body and an upper rotating body that is rotatably mounted on the lower traveling body via a swing wheel, and a working device is provided at the center of the front of the upper rotating body. , each of which has a cab on one side of its front part, the swing ring has an inner ring fixed to the lower running body, an upper outer ring and a lower outer ring fixed to the upper swing structure, and the inner ring has a main thrust race and a sub thrust race. A main thrust race and a radial race are formed on the upper outer ring, and a secondary thrust race is formed on the lower outer ring, and a gravity direction is formed between the main thrust race of the inner ring and the main thrust race of the upper outer ring. The main thrust roller that bears the load is placed between the auxiliary thrust race of the inner ring and the auxiliary thrust race of the lower outer ring, and the auxiliary thrust roller that bears the load in the anti-gravity direction is placed between the radial race of the inner ring and the radial race of the upper outer ring. A radial roller that bears the load in the radial direction is interposed in each race, while induction hardening is applied to each race of the inner, upper, and lower outer rings from the hardening start point to the end before the hardening start point. In construction machinery that has a non-hardened zone between the starting point and the end point of hardening, the inner ring, upper outer ring, and lower outer ring are assembled by placing the non-hardening zone of each race in the following position. A method for assembling a slewing ring in a construction machine, characterized by: (a) The non-hardened zone of the main thrust race of the inner ring is
(b) The non-hardened zone of the inner ring's secondary thrust race is approximately 90° on the opposite side of the cab with respect to the longitudinal center line of the vehicle passing through the center of the swing ring.
(c) The non-hardened zone of the inner ring's radial race is located at approximately 90° on the cab side with respect to the center line; (d) The main thrust race of the upper outer ring (e) The non-hardened zone of the radial race of the upper outer ring is located approximately 90° on the cab side with respect to the center line; (e) The non-hardened zone of the radial race of the upper outer ring is located approximately 90° on the opposite side of the cab with respect to the center line.
(f) The non-hardened zone of the secondary thrust race of the lower outer ring is approximately 90° on the opposite side of the cab with respect to the center line.
(g) Frequently worked area (from the front of the vehicle to the cab side)
90° range), the position where the non-hardened zones of the main thrust races, the non-hardened zones of the secondary thrust races, and the non-hardened zones of the radial races do not overlap. 2. In claim 1, at least two notch holes are provided in the inner ring at asymmetric positions with respect to the center line, and at least two notch holes are provided in the upper outer ring and the lower outer ring at asymmetric positions with respect to the center line. A method for assembling a slewing ring in a construction machine, characterized in that non-hardened zones of each race of an inner ring and upper and lower outer rings are positioned asymmetrically with respect to the above-mentioned notch holes.