JPS5819987Y2 - Bearing structure of rolling wheels used in tracks of crawler-type traveling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing structure for rolling wheels that can smoothly support a plurality of rolling wheels that guide and support the tracks of a crawler-type traveling device and that can be produced at low cost.

In recent years, floating seal mechanisms have been widely used in the bearings of rolling wheels used to guide the tracks of crawler-type traveling devices, and this mechanism has further improved the oil-tightness of the bearings and the effect of preventing dirt and sand from entering. ing.

However, the above-mentioned bearing still has some points to be improved, such as the flange of the bushing fitted into the inner surface of the rolling wheel and the shaft mounting bracket integrally attached to the frame body. An example of this is the spacer interposed between the flanges on the rolling wheel side.

That is, in the conventional structure described above, the load applied to the crawler track was transmitted as a thrust to the spacer and the flange of the shaft mounting bracket on the rolling wheel side via the flange portion of the rolling wheel and bushing.

Generally, it is desirable for the bushing to rotate while sliding against the fixed spacer, but when the spacer is subjected to thrust, it sometimes rotates together with the bushing and rotates against the flange of the shaft mounting bracket. As the spacer rotates, the spacer itself is subject to wear and tear, and both sides must be precisely machined to prevent wear and tear, resulting in frequent replacement of the spacer and increased manufacturing costs due to both sides being machined.

The present invention was devised in consideration of the current situation, and its purpose is to integrally connect the spacer to the rolling wheel side flange of the shaft mounting bracket using a required fixing means (for example, a pin or key), so that the bushing is constantly prevented. Since it rotates relative to the fixed spacer, only the bushing needs to be replaced due to wear, and only one side of the spacer needs precision machining, thereby reducing production costs and ensuring smooth bearing function. The present invention aims to provide a bearing structure for rolling wheels.

The present invention provides a bearing structure in which a crawler-guide rolling wheel of a crawler type traveling device is rotatably supported on a rolling wheel support shaft via a floating seal mechanism, in which flanged bushings are integrally attached to the inner peripheral surface of both ends of the rotating driving wheel. The rolling wheel can be freely rotated by the rolling wheel support shaft, and both ends of the rolling wheel support shaft are attached to the main body frame via a shaft mounting bracket, and the rolling wheel side flange of the coaxial mounting bracket is A spacer is interposed between the flange part of the same bushing, and a connecting pin for preventing rotation is inserted into the abutment surface of the spacer and the rotating drive wheel side flange part to integrally connect the spacer and the shaft mounting bracket. This invention relates to a bearing structure for a rolling wheel used in a crawler track of a crawler-type traveling device, which is characterized by being fixedly fixed.

The mounting structure for the rolling wheels will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 is an overall view of a crawler-type traveling device (a drag shovel is exemplified in the present invention) equipped with the mounting structure according to the present invention, and the device generally includes an upper rotating body 1 and a lower rotating body 1. The upper rotating body is composed of a driver's seat 3, a rotating mechanism 4, an excavating shovel 5, and first and second arms 6.7 for driving the excavator. The drive mechanism 2 includes a crawler belt 8, drive wheels and guide wheels 9, 10 that drive the crawler belt in a stretched state, and upper rolling wheels 11 and lower rolling wheels 12 that stabilize the stretched state.

The rolling wheel mounting structure according to the present invention relates exclusively to the bearing structure of the lower rolling wheel 12 mentioned above, and the structure is shown in detail in FIGS. 2 and 3.

That is, the lower rolling wheel 12 has a concave center, the center of the rotating wheel 12 is inserted through the rolling wheel support shaft 15, and both ends of the same shaft protrude from both sides of the rolling wheel 12. A bushing 14 is interposed between the bushing 12 and the support shaft 15, and a flange portion 17 is connected to the outer end of the bushing 14 in a brim-like manner.

Further, both ends of the rolling wheel support shaft 15 are supported by shaft mounting brackets 20 that are integrally connected to the frame body 23 of the crawler type traveling device with bolts 25. A driving wheel side flange 18 is integrally connected to the flange 18, and a spacer 16 is integrally connected to the flange 18 via a connecting pin 19. 17
The sliding surface of the spacer 16 is precisely machined.

The seal between the shaft mounting bracket 20 and the lower rolling wheel 12 is provided with a floating seal mechanism interposed therebetween, and is configured to perform a sealing function. A sliding surface A of the floating seal mechanism is formed on the outer side of the sliding surface.

13 is a protrusion on the inner surface of the crawler track 8; 21 is a ring body connected to the shaft mounting bracket 20 to prevent gravel from entering;
22 indicates an O-ring.

The structure for attaching the rolling wheel support shaft 15 to the frame body 23 of the crawler-type traveling device can be summarized as follows: 24 in the figure is a headed pin that integrally connects the rolling wheel support shaft 15 to the shaft mounting bracket 20; is a bolt for attaching the coaxial mounting bracket to the frame body 23.

In this invention, the load applied to the crawler track when the crawler-type traveling device is running is first transmitted to the rolling wheels, and then transmitted to the spacer and the rolling-wheel-side flange of the shaft mounting bracket through the bushings fitted into the inner surface. communicated.

As described above, the spacer is integrally connected to the shaft mounting bracket fixed to the main body frame by the fixing means, so that the spacer slides without rotating together with the bushing, that is, the rolling wheel.

As described above, the rolling wheel bearing structure according to the present invention has the following effects.

(1) The thrust generated on the spacer due to the load applied to the track tries to rotate the bushing and spacer together, but since the spacer is integrally connected to the shaft mounting bracket, the rolling wheels are constantly rotating the bushing and spacer. If the bushing rotates on the sliding surface and the same rotation causes wear and tear, only the bushing needs to be replaced.

(2) Conventionally, both sides of the spacer had to be precisely polished, but as mentioned above, since the rolling wheel rotates when the bush and spacer slide, it is now necessary to precisely polish only one side, which reduces manufacturing costs. This can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a crawler-type traveling device equipped with a bearing structure for rolling wheels according to the present invention, Fig. 2 is a detailed cross-sectional view of the mounting structure, and Fig. 3 is a cross-section taken along the line 1-1 in Fig. 2. It is a diagram.

Claims (1)

[Scope of utility model registration request] In a bearing structure in which a crawler guiding rolling wheel of a crawler-type traveling device is rotatably supported on a rolling wheel support shaft via a floating seal mechanism, flanged bushings are integrally fitted into the inner circumferential surface of both ends of the rolling wheel. The rotating wheel is rotatable on the rolling wheel support shaft, and both ends of the rotating wheel supporting shaft are attached to the main body frame via a shaft mounting bracket, and the rolling wheel side flange of the coaxial mounting bracket and the flange of the same bushing are connected to each other. A spacer is interposed between the parts, and a connecting pin for preventing rotation is inserted into the abutment surface between the spacer and the rolling wheel side flange part, so that the spacer and the shaft mounting bracket are integrally connected and fixed. A bearing structure for a rolling wheel used in a crawler track of a crawler-type traveling device, characterized in that: