JPS6224582B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to hydraulic excavators, crawler cranes,
The present invention relates to a sealing structure for a swing gear chamber provided inside a swing ring that connects an upper rotating body and a lower traveling body of a truck crane or the like.

FIG. 1 is a diagram showing a hydraulic excavator. In the figure, 1 is an upper revolving structure, 2 is an attachment attached to the upper revolving structure 1, 3 is an undercarriage, and 4 is a turning ring that connects the upper revolving structure 1 and the lower revolving structure 3.

FIG. 2 is a sectional view showing the seal structure of a conventional turning gear chamber, and FIG. 3 is a detailed view of section A in FIG. 2. In the figure, 1a is the frame of the upper revolving structure 1, 5 is the rotating device attached to the frame 1a, 6 is the drain plug of the rotating device 5, 7 is the pinion attached to the output shaft of the rotating device 5, and 8 is the rotating device attached to the frame 1a. The V-shaped groove provided on the lower surface, 4a, is the outer ring 3a of the swing ring 4 attached to the frame 1a by bolts 9.
10 is the frame of the lower traveling body 3, and 10 is the frame 3a.
The center joint 4b is attached to the center joint 4b attached to the frame 3a by bolts 11.
The inner ring 12 is an internal gear provided on the inner ring 4b,
The internal gear 12 meshes with the pinion 7. 13 is a bottom plate fixed to the frame 3a, 14 is a bottom plate 13
A lid 15 provided near the pinion 7 is a partition plate provided above the bottom plate 13, and the partition plate 15 is provided outside the drain plug 6.

In this structure, the frame 1a, the bottom plate 13
A turning gear chamber 16 is constituted by the partition plate 15, and the pinion 7 and the internal gear 12 are lubricated by the grease injected into the turning gear chamber 16. When draining the oil in the swing device 5, the drain plug 6 is removed. Also,
Since the V-shaped groove 8 is provided on the lower surface of the frame 1a, water droplets are prevented from entering the turning gear chamber 16 through the lower surface of the frame 1a. However, during heavy rain or when washing with water, the V-shaped groove 8 cannot prevent water droplets from entering the turning gear chamber 16. Furthermore, since the partition plate 15 is provided outside the drain plug 6, the gap 18 between the hole 17 provided in the frame 1a and the partition plate 15 becomes large, and water or Dust gets mixed in. Furthermore, when working on a river or the like, the upper surface of the frame 1a of the upper revolving body 1 may be submerged in water, and in this case, water enters the turning gear chamber 16. For this reason, the pinion 7 and internal gear 12 may rust, and dust may adhere to the pinion 7 and internal gear 12.
The pinion 7 and internal gear 12 wear out.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a sealing structure for a swing gear chamber that can effectively prevent water and dust from entering the swing gear chamber.

In order to achieve this object, in the present invention, in a sealing structure of a turning gear chamber provided inside a turning wheel that connects an upper rotating body and an undercarriage body, a bottom plate is fixed to the frame of the undercarriage body,
A partition plate is provided above the bottom plate, an annular sliding plate is provided above the partition plate, an annular groove is provided on the lower surface of the frame of the upper revolving body, and an annular seal ring is provided in the groove. is inserted, and an annular leaf spring is provided between the seal ring and the bottom of the groove, and the leaf spring presses the seal ring against the sliding plate.

FIG. 4 is a cross-sectional view showing the seal structure of the swing gear chamber according to the present invention, FIG. 5 is a detailed view of part B in FIG. 4,
FIG. 6 is a perspective view showing an annular leaf spring. In the figure, reference numeral 19 denotes a partition plate provided above the bottom plate 13, and the partition plate 19 is provided inside the drain plug 6. 20 is a hole provided in the bottom plate 13, and the hole 20 is for operating the drain plug 6. 21 is a lid that closes the hole 20;
22 is a partition plate upper plate provided at the upper end of the partition plate 19, 23 is an annular sliding plate provided on the partition plate upper plate 22 via a knock pin 24, and 25 is a circular plate provided on the lower surface of the frame 1a. annular groove, 26
is an annular seal ring inserted into the groove 25, and the seal ring 26 is formed by integrating a rubber portion 27 and a metal ring 28;
are provided with seal parts 29 and 30, and the seal part 2
9 and 30 are filled with grease 31 and 32. 33 is the metal ring 28 of the seal ring 26 and the groove 25
A part of the plate spring 33 is cut off, and its end 34 is formed at an acute angle.

In this seal structure, the seal ring 26 is pressed against the sliding plate 23 by the leaf spring 33. Note that since the end 4 of the leaf spring 33 is formed at an acute angle, the end 34 is at the bottom 25a of the groove 25.
It bites into and stops rotation. Further, since the seal ring 26 is provided with the metal ring 28, the spring force of the leaf spring 33 can be transmitted to the seal portion 30 evenly over the entire circumference of the seal ring 26. Furthermore, the seal portions 29 and 30 are coated with grease 31 and 3.
2, it is possible to prevent the seal portions 29 and 30 from being worn out.

As explained above, in the sealing structure of the swing gear chamber according to the present invention, since the seal ring is pressed against the sliding plate by the leaf spring, it effectively prevents water and dust from entering the swing gear chamber. In addition, even if the upper surface of the frame of the upper revolving body is immersed in water during river work or the like, water will not enter the swing gear chamber. Therefore, the pinion and internal gear will not rust, and dust will not adhere to the pinion and internal gear, causing wear to the pinion and internal gear. Furthermore, even if the manufacturing accuracy of the slewing ring is low and the distance between the top surface of the partition plate and the frame of the upper swivel body fluctuates, the seal ring is pressed against the sliding plate by the leaf spring, which prevents dust from entering. It can be effectively prevented. As described above, the effects of this invention are remarkable.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a hydraulic excavator, Fig. 2 is a sectional view showing the seal structure of a conventional swing gear chamber, Fig. 3 is a detailed view of section A in Fig. 2, and Fig. 4 is a swing gear according to the present invention. FIG. 5 is a detailed view of section B in FIG. 4, and FIG. 6 is a perspective view showing an annular leaf spring. 1... Upper rotating body, 1a... Frame, 3...
Lower traveling body, 3a...frame, 4...swivel wheel,
4a...outer ring, 4b...inner ring, 5...swivel device,
7...Pinion, 12...Internal gear, 13...Bottom plate, 16...Swivel gear chamber, 19...Partition plate, 23
...Sliding plate, 25...Groove, 25a...Bottom, 26...Seal ring, 33...Plate spring, 3
4... End.

Claims (1)

[Scope of Claims] 1. In a sealing structure of a turning gear chamber provided inside a turning ring that connects an upper rotating body and a lower traveling body, a bottom plate is fixed to the frame of the lower traveling body, and the upper side of the bottom plate is fixed to the frame of the lower traveling body. a partition plate is provided on the partition plate, an annular sliding plate is provided on the upper part of the partition plate, an annular groove is provided on the lower surface of the frame of the upper revolving body, and an annular seal ring is inserted into the groove, A seal structure for a swing gear chamber, characterized in that an annular plate spring is provided between the seal ring and the bottom of the groove, and the plate spring presses the seal ring against the sliding plate. 2. The swing gear chamber according to claim 1, wherein a part of the leaf spring is cut, the end thereof is made at an acute angle, and the end is bitten into the bottom of the groove. Seal structure.