JPS621938A - Assembling of slewing ring in construction machine - Google Patents

Abstract

PURPOSE:To prevent the abrasion of slewing rings in the early period by a method in which the main and sub-thrust and radial races of inner and outer rings are set on specific positions in relation to the center line of front and behind directions of the vehicular body, or on places where the non-hardening zones of these races are not lapped on each other, and the inner and outer rings are assembled. CONSTITUTION:In assembling upper and lower outer rings 4 and 6 and inner ring 1 for a slewing ring, non-hardening zones 101 and 102 of the main and sub-thrust races of the inner ring 1 are each set on the position of 90 deg. of the opposite side of a cab 15 and on the position 90 deg. of the opposite side of the cab 15 side in relation to the center line S of the front and rear directions of the vehicular body. Also, non- hardening zones 104 and 106 of the main and sub-thrust races of the outer rings 4 and 6 are each set on the position of the cab 15 side and the position of the opposite side of the cab 15 in relation to the center line S. The soft zones 103 and 105 of the radial races of the inner and outer rings 1 and 4 are each set on the position of 90 deg. on the cab 15 side and the position of 90 deg. on the opposite side of the cab 15 in relation to the center line S, or on the place where the zones 101 and 104, the zones 102 and 106, and the zones 103 and 105 are not overlapped on each other, and the slewing ring is assembled.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for assembling a swing wheel in construction machinery such as large hydraulic excavators, crawler cranes, truck cranes, 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]

In recent large-scale construction machines, such as large-sized hydraulic excavators, a structure as shown in FIG. 3 is used as a turning 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. (not shown), and an upper outer ring 6 which is bolted to the upper revolving body together with the -L outer ring 4 through a mounting hole 7. The inner ring 1 has a main thrust race la, a sub thrust race 1b, and a radial race lc formed on its outer peripheral surface, and the upper outer ring 4 has a main last race 4a and a radial race 4 formed on its inner peripheral surface.
b, and the lower outer ring 6 has an auxiliary thrust race 6a formed on its inner peripheral surface. Then, a master last roller 8 that bears the load in the direction of gravity is connected between the main thrust race 1a of the inner ring 1- and the main thrust race 4a of the upper outer ring 4.
A secondary thrust roller 9 that bears the anti-gravity direction load is placed between the secondary thrust race 1b of the inner ring 1 and the secondary thrust race 6a of the lower outer ring 6, and a radial direction load is provided between the radial race IC of the inner ring 1 and the radial race 4b of the upper outer ring 4. A radial roller lO is interposed to bear the load. In addition, 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 will occur, so the quenching is finished before the quenching start point.

In other words, a non-quenching zone (hereinafter referred to as a soft zone) exists between the quenching start point and the quenching end point.

FIG. 4 shows an example of quenching of the inner ring 1, where A is the quenching start point, mouth 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, reference numeral 11 denotes an undercarriage, 12 an integral upper swing 4 which is rotatably mounted on the undercarriage 11 via a swing wheel 13, and 14 mounted at the center of the front part of the upper revolving structure 12. The working device 15 indicates a cab provided on the front left side of the upper revolving structure 12. In this hydraulic excavator, the lower traveling body 11 and the upper rotating body 12 are collectively 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 Front, lower running body 1
The side of the hydraulic motor 16 of No. 1 is defined as the rear side.

In the above-mentioned hydraulic excavator, when excavation is performed by the working device 14 as shown in FIG.
4 and the upper revolving structure 12. Specifically, the main thrust races Ia and 4a of the swing wheels shown in FIG. 3 bear the maximum load at the front position of the vehicle body. Also secondary thrust race lb.

6a bears the maximum load at the rear position of the vehicle body, and radial race lc and 4b bear the maximum load at the front position of the vehicle body.

The above description is about a case where a downward force is applied to the packet of the working device 14, but an upward pushing force may be applied to the packet. At this time, the main thrust races Ia and 4a of the swing wheels bear the maximum load at the rear position of the vehicle body, the secondary thrust races Ib and 6a bear the maximum load at the front position of the vehicle body, and the radial race Ic and 4b bear the maximum load at the rear position of the vehicle body. bear the maximum load.

Next, as shown in FIG.
Turn left around 0 degrees and load the excavated earth into dump truck I7. Ring 140 for turning the upper rotating body 12 to the left, cab 1
5 is located on the left side, and if the work device 14 were turned to the right, it would obstruct the driver's view and make loading difficult. 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 Ia and 4a of the swing wheels shown in FIG. 3 bear the maximum load within a range of 90 degrees to the left front of the vehicle body. Further, the secondary thrust races Ib and 6a bear the maximum load within a range of 90 degrees to the right front of the vehicle body, and the radial races], c, 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, the inner ring 1 in the turning ring. Upper outer ring 4. If the soft zone of each race of the lower outer ring 6 is arranged in a position where it frequently bears a load, there is a risk that the soft zone 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 in such a way that the soft zone of each race in the swing ring is not placed in a position that bears the maximum load during the work cycle of a construction machine. There is a particular thing.

[Summary of the invention]

The swing wheel assembly method of the present invention includes (a) positioning the soft zone of the main thrust race of the inner ring at a position approximately 90° on the opposite side of the cab with respect to the longitudinal centerline of the vehicle passing through the center of the swing wheel;
b) The soft zone of the auxiliary thrust race of the inner ring is located at approximately 900° on the cab side with respect to the center line, (C) The soft zone of the radial race of the inner ring is located approximately 90° on the cab side with respect to the center line. , (d) the soft zone of the main thrust race of the first outer ring is located at a position approximately 900° on the cab side with respect to the center line; (e) the soft zone of the radial race of the upper outer ring is located on the opposite side of the cab with respect to the center line. almost 9
0' position, (f) the soft zone of the secondary thrust race of the lower outer ring is approximately 90 degrees on the opposite side of the cab with respect to the center line.
The soft zone of the main thrust race is placed at each position, and in the frequently worked section (approximately 90° range from the front of the vehicle body to the cab side).

The soft zones of the auxiliary thrust races and the soft zones of the radial races are arranged and assembled at positions where they do not overlap, so that the maximum load is not borne by the soft zones of each race.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, taking a swing wheel of a hydraulic excavator as an example. 1st
The figure is an explanatory view showing the position of the soft zone of each race on the turning wheel, and FIG. 2 is a plan view of the turning wheel explaining the positioning of each soft zone in FIG. 1. In this embodiment, when the cab of the hydraulic excavator is provided on the left side of the front part of the single-part revolving body 12 as shown in FIG. 5, the main shaft of the inner ring 1 is Thrust race 1a
The soft zone 101 of the auxiliary thrust race of the inner ring 1 is placed at a position 90° 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 103 of the radial race of the inner ring 1 is placed at a position 90° on the cab 15 side with respect to the center line S as shown in FIG. The soft zone 104 of the main thrust race of the lower outer ring 4 is located at a position 90' on the cab 15 side, and the soft zone 104 of the main thrust race of the lower outer ring 4 is placed at a position 90° on the cab 15 side with respect to the center line S, as shown in FIG. 4 radial lace soft zone 10
5, the soft zone 106 of the auxiliary thrust race of the lower outer ring 6 is shown in FIG. Soft zones 101 and 104 of the main thrust races, soft zones 102 and 106 of the auxiliary thrust races, and soft zones 102 and 106 of the radial races are arranged at 90 degrees on the opposite side of the cab 15 with respect to the center line S. Assemble the turning ring by arranging the soft zones 103 and 105 at 1H so that they do not overlap. Furthermore, in this embodiment, the positioning of each soft zone is performed through the dowel holes. To explain this with reference to FIG. 2, the two dowel holes 17a and 17b are placed in an asymmetrical position with respect to the center line S in the inner ring 1, that is, the dowel hole 17b is located at a position offset by a certain angle 01 from the symmetrical position of the dowel hole 17a. On the other hand,
The lower running body is also provided with knock holes that coincide with the knock holes 17a and +7b, and dowel pins are press-fitted into these knock holes to position each rough 1 to zone of the inner ring 1.

In addition, the two dowel holes 18a and 18b are positioned asymmetrically with respect to the center line S across the L section outer ring 4 and the lower outer ring 6, that is, the dowel hole +8b is shifted by a certain angle 02 from the symmetrical position of the dowel hole 18b. At the same time, by providing dowel holes that coincide with the dowel holes 18a and IBb in the revolving body at the - side, and press-fitting dowel bottles into these dowel holes, -
Next, the positions of each soft zone of Shimogaiwa 4 and 6 are determined.

Therefore, in this embodiment, since the rough one-zone of each race in the swing ring is disposed at a position away from the part that bears the maximum load during the work cycle, premature wear of the soft zone can be prevented.

In addition, the zone positioning for each software 1 can be done through the dowel holes [7
Therefore, positioning can be performed accurately without paying special attention.

In this embodiment, a hydraulic excavator in which the cab 15 is provided on the front left side of the upper revolving structure 12 has been described, but in a hydraulic excavator in which the cab is provided on the right side,
Each soft zone described above is placed on the opposite side of FIG. The same applies to crawler cranes and truck lanes.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent the nine-stage wear of the soft zone of each race in the swing ring, and to extend the life of the swing ring.

[Brief explanation of the drawing]

1 and 2 show an 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. ~
A plan view of the swing ring to explain zone positioning, Figure 3 is a sectional view showing the structure of the swing ring, Figure 4 is an explanatory diagram showing the state of induction hardening on the inner ring, and Figure 5 is excavation of a hydraulic excavator. FIG. 6 is a side view showing the attitude, and FIG. 6 is a front view showing the attitude of loading excavated earth and sand into the dump truck. ]...Inner race, Ia...Main thrust race, 1b...
・Secondary thrust race, Ic...radial race, 4・
...-1 outer ring, 4a...main thrust race, "4
b...Radial race, 6...Lower outer ring, 6a...
・Secondary thrust race, 11... Lower running body of hydraulic excavator, 12... Partial rotating body, 14... Working device,
15- Cab, 17a, 17b, 18a, 18b
... Knock holes, 101 to 106... Non-hardened zones (rough 1 to zones). Patent applicant Hitachi Construction Machinery Co., Ltd. Agent Patent attorney Tadashi Akimoto Figure 4 Figure 5

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 workpiece is provided at the center of the front of the upper rotating body. The device is equipped with a cab on one side of the front, 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-wheel. A thrust race and a radial race are formed, and a main thrust race and a radial race are formed on the upper outer ring.
A secondary thrust race is formed on the lower outer ring, and a main thrust roller that bears the load in the direction of gravity is formed between the main thrust race of the inner ring and the main thrust race of the upper outer ring, and the secondary thrust race of the inner ring and the secondary thrust race of the lower outer ring. An auxiliary thrust roller that bears a load in the anti-gravity direction is interposed between the radial race of the inner ring and a radial roller that bears the load in the radial direction between the radial race of the upper outer ring. Induction hardening is applied to each race.
In a construction machine in which the quenching starts from the quenching start point and ends before the quenching start point, and the non-quenching zone exists between the quenching start point and the quenching end point, the non-quenching zone of each race A method for assembling a swing ring in a construction machine, which comprises assembling an inner ring, an upper outer ring, and a lower outer ring by arranging the wheels in the following positions. (a) The non-hardened zone of the main thrust race of the inner ring is located 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 slewing ring. (b) The non-hardened zone of the secondary thrust race of the inner ring The hardened zone is located at approximately 90° on the cab side with respect to the center line, (c) the non-hardened zone of the inner ring radial race is located approximately 90° on the cab side with respect to the center line, (d) the upper outer ring (e) The non-hardened zone of the main thrust race is located at approximately 90° on the cab side with respect to the center line, and the non-hardened zone of the radial race of the upper outer ring is 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 9° on the opposite side of the carburetor with respect to the center line.
0° position, (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 dowel holes are provided in the inner ring at asymmetric positions with respect to the center line, and at least two dowel holes are provided in the inner ring at asymmetric positions with respect to the center line, and at least two dowel holes are provided in the inner ring at asymmetric positions with respect to the center line.
A construction characterized in that dowel holes are provided at asymmetrical positions with respect to the center line, and non-hardened zones of the inner race and each race of the upper and lower outer races are positioned through each of the dowel holes. How to assemble a slewing ring in a machine.