JPH0685451U - Rotary joint structure of swivel work vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] A steel shaft is fitted in a cast tubular body so that it can rotate relative to one another, and one of the body and shaft is connected to a swivel base and the other to a traveling device, and In a rotary joint of a swivel work vehicle in which an annular oil groove connecting an oil passage of a shaft and an oil passage of a shaft is formed between an inner peripheral surface of a body and an outer peripheral surface of a shaft, labor and cost required for forming the annular oil groove are reduced. [Configuration] Oil passage 11 of body 9 and oil passage 1 of shaft 10
The annular oil groove 13 connecting the two is formed only by the annular groove formed only by casting on the inner peripheral surface of the body 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary joint structure used for supplying and discharging pressure oil between a traveling vehicle body and a swivel mounted on the swivel work vehicle such as a full swivel type backhoe.

[0002]

[Prior art]

 Conventionally, in the rotary joint structure, as shown in FIG. 4, a shaft 10 made of a steel material is relatively rotatably fitted in a cylindrical tubular body 9 made of casting, and one of the body 9 and the shaft 10 is used as a swivel base. The other end is connected to the traveling vehicle body, and annular grooves 21 and 22 are formed by cutting on both the inner peripheral surface of the body 9 and the outer peripheral surface of the shaft 10. The body 9 is formed by the cooperation of these annular grooves 21 and 22. An annular oil groove was formed to connect the oil passage 11 of No. 1 and the oil passage 12 of the shaft 10 (for example, see Japanese Utility Model Laid-Open No. 57-18058).

[0003]

[Problems to be solved by the device]

 However, cutting the annular groove on both the inner peripheral surface of the body and the outer peripheral surface of the shaft requires a great deal of labor and processing cost, and there is room for improvement in terms of manufacturability and manufacturing cost. An object of the present invention is to sufficiently reduce the labor and cost required for forming the annular oil groove.

[0004]

[Means for Solving the Problems]

 The characteristic configuration of the present invention is that a steel shaft is fitted in a cast tubular body so as to be rotatable relative to each other, and one of the body and the shaft is connected to a swivel base and the other is connected to a traveling vehicle body, and an oil passage of the body is formed. In a revolving work vehicle in which an annular oil groove that connects the oil passage of the shaft is formed between the inner peripheral surface of the body and the outer peripheral surface of the shaft, an annular groove is formed only on the inner peripheral surface of the body by only casting. The oil groove is formed.

[0005]

[Action]

 That is, by forming an annular groove on the inner peripheral surface of the body only by casting, and forming an annular oil groove only by the annular groove, the machining of the annular groove for the oil groove of the body in comparison with the above-mentioned prior art is performed. Further, it is possible to omit the formation of the annular groove for the oil groove of the shaft, and it is possible to sufficiently reduce the labor and cost required for forming the annular oil groove.

[0006]

[Effect of device]

 As a result, it has become possible to provide a rotary joint for a revolving work vehicle, which is advantageous in terms of manufacturability and manufacturing cost, which can sufficiently reduce the labor and cost required for forming the annular oil groove.

[0007]

【Example】

 As shown in FIG. 1, a swivel base 3 is mounted on a traveling vehicle A equipped with a tozer 1 and a crawler type traveling device 2 which can be lifted and lowered by a hydraulic cylinder 1a so as to be driven and swiveled around a vertical axis, and a hydraulic cylinder 7a is provided. A swing bracket 4a that can be swung to the left and right is provided on the swivel base 3, and a boom 4b that is mounted on a swing bracket 4a that can be lifted and swung by a hydraulic cylinder 7b and a boom 4b that can be bent and swung by a hydraulic cylinder 7c. A backhoe device 4 including a bucket 4d attached to the arm 4c is provided, and a swivel base 3 is provided with a driving unit 5, a driving unit 6, and the like. A backhoe with a dozer, which is an example of a work vehicle, is configured. In order to connect a pump, a tank, and an operation valve on the swivel 3 side to a traveling hydraulic motor (not shown) on the traveling vehicle A side and a hydraulic cylinder 1a for raising and lowering the dozer, the swivel 3 and the traveling vehicle A are connected. A rotary joint 8 is provided between them. To form the rotary joint 8, as shown in FIG. 2 and FIG. 3, a steel shaft 10 is fitted in a cast tubular body 9 so as to be rotatable relative to each other, and the body 9 is attached to the swivel base 3 and the shaft. A large number of annular oils that connect the oil passage 11 of the body 9 that is connected to the traveling vehicle body A and that is connected to the pump, the tank, and the operation valve and the oil passage 12 of the shaft 10 that is connected to the traveling hydraulic motor and the hydraulic cylinder 1a. In order to arrange the groove 13 between the inner peripheral surface of the body 9 and the outer peripheral surface of the shaft 10, the annular oil groove 13 is formed only on the inner peripheral surface of the body 9 by the casting. The number of steps and the cost required to form the annular oil groove 13 can be reduced. Incidentally, an annular groove is formed on the outer peripheral surface of the shaft 10 on both sides of each of the annular oil grooves 13 by cutting, and a seal ring 14 is fitted in each of the annular grooves to prevent oil leakage.

[Other Embodiment] It is also possible to connect the body 9 to the traveling device 2 and the shaft 10 to the swivel base 3. The traveling vehicle body A may be a wheel traveling type. The type of the working device of the swivel base 3 can be appropriately selected, and in short, a swivel type work vehicle may be used.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

1] Side view of backhoe

[Fig.2] Sectional view of rotary joint

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a main part diagram of a conventional example

[Explanation of symbols]

 3 Swivel base 9 Body 10 Shafts 11 and 12 Oil passage 13 Annular oil groove A Traveling vehicle

Claims (1)

[Scope of utility model registration request] 1. A steel tubular shaft (10) is fitted in a cast tubular body (9) so as to be relatively rotatable, and one of the body (9) and the shaft (10) is turned on a swivel base (3).
And the other is connected to the traveling vehicle body (A), and an annular oil groove (13) for connecting the oil passage (11) of the body (9) and the oil passage (12) of the shaft (10) is formed in the body (9). ) And the outer peripheral surface of the shaft (10), the rotary work vehicle is formed between the inner peripheral surface of the body (9) and the annular oil groove ( 13) The rotary joint structure of the swivel work vehicle which is formed.