JPH0586774U - Integrated press-fit upper wheel - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding the upper wheels of the undercarriage devices of track-type construction vehicles such as bulldozers and power shovels, in particular, the structure is simplified to reduce the cost, and the soil on the upper wheel seals Prevent intrusion. [Structure] An upper wheel that carries a crawler belt of a crawler-type construction vehicle and is pivotally supported by a track frame through a bracket, and a shaft fixed to the track frame through the bracket and one end of which is rotated by the shaft. The roller shell is rotatably supported and has a bush pressed into the other end. The bush is rotatably supported at the end of the shaft and is hermetically supported to the outside. The thrust receiving portions of the roller shell and the bush are formed on the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of an upper wheel in an underbody device of a crawler-type construction vehicle such as a bulldozer or a power shovel.

[0002]

[Prior Art]

 FIG. 3 is an external view of the bulldozer. The track frame 20 has a guide wheel 30 mounted on the front side thereof and an activation wheel 31 mounted on the rear side thereof, and a crawler belt 32 wound around the track frame 20. A lower roller 34 is mounted on the lower surface of the track frame 20, and an upper roller 35 rotatably mounted on an upper wheel bracket 21 fixed to the track frame 20 carries the crawler belt 32 on the upper portion. is doing.

FIG. 4 is a sectional view of a conventional upper roller. Since the roller shell 40 is a forged product and cannot be integrally molded, the roller (I) 41 and the roller (II) 42 are welded at the central portion 43. The roller shell 40 is mounted on a shaft 44 via a bearing 45, and a floating seal 47 is mounted between the roller shell 40 and a collar 46 fitted on the shaft 44 to prevent intrusion of earth and sand and oil leakage. To prevent. One end of the shaft 44 is split and fastened to an upper wheel bracket 21 fixed to the track frame 20 and fastened by a bolt 22. The roller shell 40 abuts the link 33 of the crawler belt 32 and carries the crawler belt 32, and rotates according to the movement of the crawler belt while the vehicle is traveling.

[0004]

[Problems to be solved by the device]

 According to the above configuration, the roller shell has a welded configuration, has a complicated structure, has a large number of parts, and is not economical. Further, since the roller shell end face 48 and the floating seal 47 are close to each other, there is a problem that oil leakage occurs due to intrusion of earth and sand or freezing in winter. The present invention was made in view of the above problems, and an object thereof is to economically obtain a simple upper roller with high sealing performance.

[0005]

[Means for Solving the Problems]

 The present invention has been made in order to solve the problems in the above-mentioned prior art. Claim 1 relates to an upper wheel that carries a crawler belt of a crawler-type construction vehicle and is pivotally supported by a track frame via a bracket. , A shaft fixed to the track frame via the bracket, and a roller shell in which one end of the shaft is rotatably supported by the shaft and a bush is press-fitted at the other end, and the bush is attached to the end of the shaft. The roller bearing is rotatably supported in a sealed manner with respect to the outside, and a thrust receiving portion of the roller shell is formed between both shaft supporting portions of the shaft. A labyrinth groove is formed on each side surface of the bracket facing the side surface, and a seal for sealing between the shaft and the roller shell side surface adjacent to the labyrinth groove is attached. The reference numeral 3 indicates that the flange portion of the adapter, which press-fits the shaft into the inner diameter portion and axially supports the outer diameter portion on the track frame through the bracket, is disposed between the bracket and each side surface of the roller shell. And a labyrinth groove is formed on each side surface of the roller shell facing the side surface, and a seal for sealing between the shaft and the side surface of the roller shell adjacent to the labyrinth groove is mounted.

[0006]

[Action]

 Next, the operation of the above configuration will be described. According to a first aspect of the present invention, one end of a shaft fixed to a track frame via a bracket is rotatably supported, and the other end is rotatably supported by an end of the shaft, and the shaft is sealed to the outside. It is composed of a roller shell in which a supported bush is press-fitted, and the thrust receiving portion of the roller shell is formed between both shaft support portions of the shaft, so that the crawler belt is rotated with the transition of the crawler belt to carry the crawler belt, and Thrust can also be supported. A seal for sealing between a side surface of the roller shell and a side surface of a bracket facing the side surface of the roller shell, and a side surface of the roller shell adjacent to the labyrinth groove between the shaft and the shaft. Since the lubricating oil for the shaft support portion of the roller shell and bush is sealed, the labyrinth groove prevents the intrusion of earth and sand into the seal portion. According to a third aspect of the present invention, a flange portion of an adapter that press-fits the shaft into the inner diameter portion and axially supports the outer diameter portion on the track frame through the bracket is arranged between the bracket and each side surface of the roller shell. Since a labyrinth groove is formed on each side surface of the roller shell and the side surface of the roller shell facing the side surface, and a seal for sealing between the shaft and the side surface of the roller shell adjacent to the labyrinth groove is attached, the inner diameter portion of the adapter If the outer diameter part and the outer diameter part are manufactured so as to match the shaft diameter and the hole diameter of the bracket, the integrated press-fit type upper wheel can be shared by each model.

[0007]

【Example】

 FIG. 1 is a sectional view of a first embodiment of an integral press-fitting upper rolling wheel according to the present invention, and FIG. 2 is an adapter for fixing the shaft and the upper rolling wheel bracket between a roller shell and a conventional upper rolling wheel bracket. FIG. 7 is a sectional view of a second embodiment of the integrally press-fit type upper roller according to the present invention, in which is inserted.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a view showing an embodiment corresponding to claim 1 and claim 2 of the present invention. A flanged bearing 4 and an oil seal 5 are attached to the left side of a roller shell 1 which is integrally formed. Next, after the stepped shaft 3 is fitted from the right side of the roller shell 1, the bush 2 to which the bearing 4 is attached is pressed into the right side of the roller shell 1. Next, the shaft 3 is fixed to the upper wheel bracket 21 by split tightening with bolts 22, so that the roller portion of the upper wheel is rotatably attached to the shaft 3 and the load in the thrust direction applied to the roller portion is applied. If it does, it can be received by the flanges of the two bearings 4. The bearing lubricating grease is supplied from the grease nipple 6 to the space of the roller shell 1 to lubricate the flanges and the inner circumference of the two bearings 4. Further, the shaft 3 of the upper roller is fixed to the upper wheel bracket 21, and labyrinth grooves are formed on the side surface of the roller shell 1 and the side surface of the upper wheel bracket 21 adjacent to the side surface. Is processed as follows.

FIG. 2 is a diagram showing an embodiment corresponding to claim 3 of the present invention. Between the roller shell 1 and the conventional upper wheel bracket 21, the shaft 3 and the upper wheel bracket 21 are fixedly attached to the saler adapter 7. Are inserted, and the side surfaces of the adapter 7 adjacent to the side surfaces of the roller shell 1 are processed to form labyrinth grooves with each other.

Next, the operation of the above configuration will be described. The roller portion including the roller shell 1, the bush 2, the bearing 4, the oil seal 5 and the grease nipple 6 in FIG. 1 or 2 is the link of the crawler belt 32 in FIG. 33 is carried, and when the vehicle runs, the crawler belt 32 moves to rotate on the shaft 3 in FIG. 1 or 2. When a thrust load is applied from the lateral direction of the crawler belt 32, it is received by the step portion of the shaft 3 via the flange portions of the two bearings 4. Further, the labyrinth groove formed on the side surface of the roller shell 1 in FIG. 1 and the side surface adjacent to the side surface, or the side surface of the adapter 7 adjacent to the side surface of the roller shell 1 in FIG. It also serves to protect the oil seal 5.

As shown in FIG. 2, when the integrated press-fitting type upper rolling wheel of the present invention is mounted on the upper rolling wheel bracket 21 through the adapter 7, the integral press-fitting type upper rolling wheel has a predetermined axial diameter. Since it can be attached to the shaft hole diameters of various upper rolling wheel brackets 21 such as the conventional upper rolling wheel bracket 21, one type of integrated press-fitting upper rolling wheel can be shared. Alternatively, when the upper wheel bracket 21 in FIG. 1 becomes large and it is difficult to form the labyrinth groove, the manufacturing cost can be reduced by mounting the upper wheel bracket 21 via the adapter 7 as shown in FIG.

[0012]

[Effect of the device]

 As described above, the present invention integrally forms the upper roller roller shell of the crawler type construction vehicle, and the roller portion has a simple structure based on the roller shell and the bush, and is adjacent to the side surface of the roller shell. Since the labyrinth groove is machined on the side of the upper wheel bracket or adapter, the following effects are achieved. (1) The structure is simple, the number of parts is small, and it is extremely economical. (2) The labyrinth groove prevents the intrusion of earth and sand, so protect the oil seal and prevent oil leakage. (3) If an adapter is used, it can be installed in the shaft hole diameter of various upper wheel brackets such as conventional upper wheel brackets, so one type of integrated press-fit upper wheel can be standardized. Can be planned.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment corresponding to claims 1 and 2 of the present invention.

FIG. 2 is a view showing a second embodiment corresponding to claim 3 of the present invention.

FIG. 3 is a diagram showing an overall outline of a bulldozer.

FIG. 4 is a diagram showing a conventional technique.

[Explanation of symbols]

 1 Roller Shell 2 Bushing 3 Shaft 4 Bearing 5 Oil Seal 6 Grease Nipple 7 Adapter 21 Upper Roller Bracket

Claims (3)

[Scope of utility model registration request] 1. An upper wheel, which carries a crawler belt of a crawler-type construction vehicle and is axially supported by a track frame via a bracket, and a shaft fixed to the track frame via the bracket, and one end of the shaft. Is rotatably rotatably supported and a bush is press-fitted into the other end of the roller shell. The bush is rotatably supported at the end of the shaft and is hermetically supported to the outside. An integral press-fitting type upper wheel, characterized in that the roller shell and the thrust receiving portion of the bush are formed between the supporting portions. 2. A labyrinth groove is formed on each of a side surface of the roller shell and a side surface of a bracket facing the side surface, and a seal for sealing between the shaft and the side surface of the roller shell adjacent to the labyrinth groove is mounted. The integral press-fitting type upper roller according to claim 1, wherein 3. A flange portion of an adapter, which press-fits the shaft into an inner diameter portion and axially supports the outer diameter portion on the track frame via the bracket, is arranged between the bracket and each side surface of the roller shell, Forming a labyrinth groove on each of the side surface and the side surface of the roller shell facing the side surface,
2. The integrally press fit type upper wheel according to claim 1, further comprising a seal mounted on a side surface of the roller shell adjacent to the labyrinth groove to seal the shaft.