JPH072738Y2 - Swivel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention mainly relates to a swinging device for reducing rattling of a swinging bearing for a construction machine.

2. Description of the Related Art FIG. 5 is a partially cutaway side view of a hydraulic excavator. In the figure, 1 is a lower traveling structure, 2 is an upper revolving structure, 3 is a revolving device, 4 is a revolving motor in the revolving device 3, and 5 is a revolving bearing. FIG. 6 is a cross-sectional view of an essential part showing details of the portion A in FIG. In the figure, 6 is the inner ring of the slewing bearing 5, and 7 is the inner ring 6.
Is an internal gear, 8 is an outer ring, 9 is a rolling element, 10 is a revolving pinion, and 11 is a substrate of the upper revolving body 2.

Next, the structure and function of the conventional swivel device 3 will be described. The inner ring 6 is fixedly attached to the lower traveling body 1, and the outer ring 8 is fixedly attached to the base plate 11 of the upper revolving structure 2 by tightening bolts. A plurality of rolling elements (balls, rollers, etc.) 9 are arranged on the same circumference between the outer ring 8 and the inner ring 6. Further, the turning motor 4 is installed on the substrate 11, and the turning pinion 10 is meshed with the internal gear 7. Then, by rotating the revolving pinion 10, the revolving force causes the upper revolving superstructure 2 to revolve.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Since the outer ring of the slewing bearing is rotatably operated with respect to the inner ring through the rolling elements, there is a gap between the rolling grooves of the outer ring and the inner ring and the rolling elements. As a result, the excavation bucket tip of the hydraulic excavator has a rattling width of several tens of millimeters. Therefore, it is difficult to position the bucket and perform fine movement operation. Also, during excavation work, rattling of the slewing bearing was transmitted to the driver's seat, which made the ride uncomfortable and uncomfortable.

It is an object of the present invention to solve the above problems and to provide a turning device that reduces rattling of a turning bearing during excavation work or the like.

Means for solving the problems a. A boss member for pivotally supporting another pinion shaft is fixedly provided on the outer ring mounting substrate of the upper revolving structure, and the pinion shaft is rotatably fitted in a vertical shaft hole portion of the boss member, and the pinion is mounted. The pinion body mounting portion on the lower end side of the shaft is formed so as to be slightly eccentric with respect to the axis of the pinion shaft, and the pinion body is mounted on the pinion body mounting portion so as to mesh with the internal gear of the inner ring, and the pinion body is attached. The device is rotatably attached to the pinion body mounting part. Also, a lever member is fixedly provided on the upper end shaft portion of the pinion shaft, while a loose spring mechanism is provided on the outer ring mounting substrate, and the rod tip portion of the loose spring mechanism and the lever member tip portion are freely bendable. To C. When the swing motor is stopped, the tooth portion of the pinion body is pressed into engagement with the tooth portion of the inner ring internal gear by the spring force of the loose spring mechanism inner spring, and d. When rotating the turning motor, the loose spring mechanism can be operated by the turning operation signal, and the backlash between the inner ring internal gear and the pinion body tooth portion can be sufficiently maintained.

Action a. Since the hydraulic pressure is not acting on the cylinder of the loose spring mechanism when the swing motor is stopped, the loose spring mechanism is in the contracted state. In the above state, in the meshing portion between the tooth portion of the pinion body and the internal gear, the pinion body is positioned so that the amount of eccentricity is maximized, and at that time, the spring force of the loose spring mechanism internal spring causes the internal ring internal gear. It is set so that the tooth portion of the pinion body is engaged with the tooth portion in the pressed state. Therefore, in the meshing portion in the above state, the meshing (play) of the inner ring with the rolling elements and the outer ring is removed. Therefore, rattling of the slewing bearing is reduced when the construction machine stops the slewing operation and is performing work.

B. When rotating the swing motor, pressure oil is supplied to the cylinder of the loose spring mechanism by the swing operation signal. The loose spring mechanism operates to extend against the spring force of the spring in the mechanism. Then, the pinion shaft is rotated, and the eccentric amount of the pinion body decreases at the meshing portion between the tooth portion of the pinion body and the internal gear. Therefore, the backlash is sufficiently retained at the meshed portion in the above state. Therefore, the turning operation of the construction machine can be performed without any trouble.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view of a main part of a swivel device 12 according to the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as those in the prior art. Reference numeral 13 is a substrate of an upper swing body (not shown) 14. FIG. 2 shows the first
It is a B section detailed drawing of a figure. In the figure, 15 is a boss member, 16
Is a vertical shaft hole of the boss member 15, 17 is a pinion shaft, O-
O'is the axis of the pinion shaft 17, 18 is the pinion body mounting portion of the pinion shaft 17, PP 'is the eccentricity of the pinion body mounting portion 18, Q
Is the (maximum) eccentricity between the axis O-O 'and the eccentric P-P', 19
Is an upper end shaft portion of the pinion shaft 17, 20 is a pinion body, 21 is a lever member, 22 is a loose spring mechanism, 23 is a cylinder of the loose spring mechanism 22, 24 is a spring, 25 is a rod,
Reference numeral 26 is a metal fitting fixed to the substrate 13. Figure 3 shows the second
It is a principal part top view seen from C of the figure. FIG. 4 is a hydraulic circuit diagram for operating the loose spring mechanism 22. In the figure, 4 is a turning motor, 27 is a turning direction switching valve, 28 is a main pump, 29 is a pilot pump, 30 is a remote control valve, 31
Is a shuttle valve, 32 is a pilot valve, 33 is a throttle for delaying operation, 34 is a check valve, 35 and 36 are leaf valves 37, and an oil tank.

Next, the structure of the turning device 12 according to the present invention will be described with reference to FIGS. A boss member 15 that pivotally supports the pinion shaft 17 is fixedly provided on the base plate 13 of the upper swing body 14, and the pinion shaft 17 is rotatably inserted into the vertical shaft hole portion 16 of the boss member 15, The pinion body mounting portion on the lower end side of the pinion shaft 17
The pinion 18 is formed so as to be eccentric by the eccentricity Q with respect to the axis O-O 'of the pinion shaft 17. Then, the pinion body 20 is attached to the pinion body attachment portion 18 in a meshed state with the internal gear 7 of the inner ring 6, and the pinion body 20 is attached to the pinion body attachment portion.
It was rotatably attached to 18. Also, the above pinion shaft
A lever member 21 is fixedly provided on the upper end shaft portion 19 of 17, and on the other hand,
The loose spring mechanism 22 is provided on the locking metal fitting 26 fixed to the substrate 13, and the tip of the rod 25 of the loose spring mechanism 22 and the tip of the lever member 21 are flexibly connected. When the swing motor 4 is stopped, the loose spring mechanism 22 causes the spring force of the inner spring 24 to push the pinion body 20 against the tooth portion of the internal gear 7 for the internal gear 6.
When the turning motor 4 is rotationally operated, the loose spring mechanism 22 can be operated by the turning operation signal, and the internal gear 7 for the inner ring 6 and the tooth part of the pinion body 20 are engaged. Achieves sufficient backlash retention.

Next, the function and function of the turning device 12 according to the present invention will be described. When the turning motor 4 is stopped,
As shown, the operating lever 38 of the remote control valve 30 is in the neutral position. Since the pilot pressure from the pilot pump 29 does not act on the pilot pressure receiving portion 39 of the pilot valve 32, the pilot valve 32 is in the tank communication oil passage position a. That is, since the hydraulic pressure is not acting on the cylinder 23 of the loose spring mechanism 22, the loose spring mechanism 22 is in the contracted state. In the state described above, the pinion body 20 is positioned so that the eccentric amount of the pinion body 20 becomes maximum (Q) at the meshing portion of the tooth portion of the pinion body 20 and the internal gear 7, and at that time, the loose spring mechanism 22 of the inner spring 24 Due to the spring force, the above-mentioned pinion body is attached to the tooth portion of the internal gear 7 for the inner ring 6.
It is set so that the teeth of 20 mesh with the pressed state.
Therefore, in the meshed portion in the above state, the clearance (play) between the inner ring 6 and the rolling elements 9 and the outer ring 8 is removed. Therefore, rattling of the slewing bearing 5 is reduced when the construction machine stops the slewing operation and is working. Next, when the turning motor 4 is rotated, the operation lever 38 of the remote control valve 30 is operated in either the left or right direction. The pilot pressure from the pilot pump 29 acts on the pilot pressure pressure receiving portion 40 or 41 of the turning direction switching valve 27 via the remote control valve 30. Therefore, since the direction switching valve 27 switches to either the left or right direction, the turning motor 4 starts forward rotation or reverse rotation. At the same time, the pilot pressure derived from the shaft valve 31 passes through the pilot oil passage 42 and acts on the pilot pressure receiving portion 39 of the pilot valve 32. Pilot valve
32 is switched from position a to position b, so main pump 28
The pressure oil discharged from is supplied to the cylinder 23 via the oil passages 43, 44, 45, the position b of the pilot valve 32, the oil passage 46, and the throttle portion 33. The loose spring mechanism 22 is a spring inside the mechanism.
Stretches against the spring force of 24. So pinion shaft 17
Is rotated, and the amount of eccentricity of the pinion body 20 decreases at the meshing portion between the tooth portion of the pinion body 20 and the internal gear 7. Therefore, the backflush is sufficiently held at the meshing portion in the above state. Therefore, the turning operation of the construction machine can be performed without any trouble.

Effect of the Invention The slewing bearing of the prior art has not been provided with a device capable of removing a clearance between the rolling grooves of the outer ring and the inner ring and the rolling element. As a result, the excavation bucket tip of the hydraulic excavator has a rattling width of several tens of millimeters. Therefore, it is difficult to position the bucket and perform fine movement operation. Also, during excavation work, rattling of the slewing bearing was transmitted to the driver's seat, which made the ride uncomfortable and uncomfortable.

However, in the turning device according to the present invention, a boss member for pivotally supporting another pinion shaft is fixedly provided on the outer ring mounting substrate,
The pinion shaft is rotatably inserted into the vertical shaft hole of the boss member, and the pinion body mounting portion on the lower end side of the pinion shaft is formed slightly eccentric with respect to the axis of the pinion shaft. The pinion body is attached to the pinion body attachment portion in a state of being meshed with the internal gear of the inner ring, and the pinion body is rotatably attached to the pinion body attachment portion, and the lever is attached to the upper end shaft portion of the pinion shaft. A member is fixedly provided, and on the other hand, a loose spring mechanism is provided on the outer ring mounting substrate, and the rod end of the loose spring mechanism and the lever member tip are flexibly connected, and the swing motor swing motor is stopped. During the rotation, the spring force of the loose spring mechanism internal spring engages the tooth portion of the pinion body with the tooth portion of the inner ring internal gear in a pressed state to rotate the turning motor. Was fully capable of holding constituting a backlash between ready and the inner ring gear and the pinion member teeth loose spring mechanism by its pivot actuation signal when actuated. As a result, when the turning motor is stopped, the pinion body of the pinion shaft presses the inner ring internal gear, and when the turning motor rotates, the cylinder is pressed by the loose spring mechanism to release the pressed state, which hinders the turning operation of the upper turning body. There is no.

Therefore, in the construction machine equipped with the swivel device according to the present invention, the rattling of the swivel bearing during work is reduced, and the positioning and fine movement operation of the work implement can be performed accurately. It improves the operability of fine movement and helps improve the ride comfort of the driver.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an essential part showing a swivel device according to the present invention, FIG. 2 is a detailed view of a portion B of FIG. 1, and FIG. 3 is a C of FIG.
Fig. 4 is a plan view of essential parts seen from a more detailed perspective. Fig. 4 is a hydraulic circuit diagram for operating the loose spring mechanism. Fig. 5 is a partially cutaway side view of the hydraulic excavator. FIG. 2,14 …… Upper revolving structure 3,12 …… Swing device 4 …… Slewing motor 5 …… Slewing bearing 6 …… Inner ring 7 …… Internal gear 8 …… Outer ring 10 …… Swing pinion 11, 13 …… Substrate 15 …… Boss member 17 …… Pinion shaft 18 …… Pinion body mounting part 20 …… Pinion body 21 …… Lever member 22 …… Loose spring mechanism

Claims (1)

[Scope of utility model registration request] 1. An inner ring provided with an internal gear is fixed to a lower traveling body, an outer ring is fixed to an upper revolving body, and a plurality of rolling elements are provided on the same circumference between the outer ring and the inner ring. In the revolving device having a structure in which the revolving pinion of the revolving motor installed in the upper revolving structure and the internal gear on the lower traveling body side are engaged with each other and the upper revolving structure is revolved by the rotational force of the revolving pinion. A boss member that pivotally supports another pinion shaft is fixedly provided on the outer ring mounting substrate of, and the pinion shaft is rotatably inserted into the vertical shaft hole portion of the boss member, and the pinion shaft lower end side Of the pinion body is formed slightly eccentric with respect to the axis of the pinion shaft, the pinion body is attached to the internal gear of the inner ring in a meshed state, and the pinion body is attached to the pinion body. Mounted so that it can rotate freely Also, a lever member is fixedly provided on the upper end shaft portion of the pinion shaft, while a loose spring mechanism is provided on the outer ring mounting substrate, and the rod tip portion of the loose spring mechanism and the lever member tip portion are freely bendable. When the turning motor for the turning device is stopped, the tooth portion of the pinion body is engaged with the tooth portion of the inner ring internal gear by the spring force of the loose spring mechanism inner spring in a pressed state. A swivel device characterized in that when the swivel motor is rotationally operated, a loose spring mechanism can be actuated by the swivel actuating signal, and a backflush between the inner ring internal gear and the pinion body tooth portion can be sufficiently retained.