# US 2021/0277625 A1 · Swivel joint and construction machine having the same

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- Number: US 2021/0277625 A1
- Document ID: US20210277625A1
- Status: Published application
- Kind: A1
- Application number: 17/192,122
- Filed: 2021-03-04
- Published: 2021-09-09
- Earliest claimed: 2020-03-05
- Assignees: Doosan Infracore Co., Ltd.
- Applicants: Doosan Infracore Co., Ltd.
- Inventors: Kwangsik BAE
- Web page: https://patentgrep.com/patent/US20210277625A1

## CPC

- E02F 9/123: {Drives or control devices specially adapted therefor (E02F9/125 and E02F9/128 take precedence)}
- E02F 9/006: {Pivot joint assemblies (in general F16C11/04)}
- E02F 9/2275: {Hoses and supports therefor and protection therefor}
- E02F 9/264: {Sensors and their calibration for indicating the position of the work tool}
- F16L 39/06: of the multiline swivel type, e.g. comprising a plurality of axially mounted modules
- E02F 9/12: Slewing or traversing gears (roller and ball bearings F16C)
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

Embodiments of the present disclosure may be directed to a swivel joint for connecting hydraulic oil between a lower body of a construction machine and an upper body rotatably supported by the lower body, the swivel joint including: a rotation support body including a first body supported by the lower body and a second body rotatably coupled to the first body and rotating together with the upper body when the upper body rotates; and a sensor supported by the rotation support body to detect rotation of the upper body.

## Claims

### Claim 1

A swivel joint for connecting hydraulic oil between a lower body of a construction machine and an upper body rotatably supported by the lower body, the swivel joint comprising:
a rotation support body comprising a first body supported by the lower body and a second body rotatably coupled to the first body and rotating together with the upper body when the upper body rotates; and
a sensor supported by the rotation support body to detect rotation of the upper body.

### Claim 2 (depends on 1)

The swivel joint of claim 1, wherein the sensor comprises:
a detector rotating together with the second body; and
a relative detector supported by the lower body and providing relative rotation information between the upper body and the lower body to the detector.

### Claim 3 (depends on 2)

The swivel joint of claim 2, further comprising:
a second through hole defined inside the second body; and
a guide pipe disposed in the second through hole and supporting the relative detector.

### Claim 4 (depends on 2)

The swivel joint of claim 2, further comprising:
a securing bracket configured to secure position of the relative detector.

### Claim 5 (depends on 2)

The swivel joint of claim 2, further comprising:
a support comprising a spacer member disposed in parallel in a longitudinal direction of the second body and configured to form an installation space for the detector and the relative detector disposed above the second body.

### Claim 6 (depends on 5)

The swivel joint of claim 5, wherein the support further comprises:
a base member between the second body and the spacer member and connecting the second body and the detector.

### Claim 7 (depends on 5)

The swivel joint of claim 5, further comprising:
a securing bracket configured to secure position of the relative detector.
a rotation support supported to the second body by the spacer member and configured to rotate together with the upper body when the upper body rotates.

### Claim 8 (depends on 7)

The swivel joint of claim 7, wherein the securing bracket comprises:
a bracket support surface supported one surface of the relative detector; and
a second protrusion protruding from the bracket support surface.

### Claim 9 (depends on 8)

The swivel joint of claim 8, wherein the rotation support comprises:
a securing support having a support coupling groove coupled to the second protrusion.

### Claim 10 (depends on 3)

The swivel joint of claim 3 further comprising:
a securing bracket configured to secure position of the relative detector,
wherein the guide pipe is coupled to the securing bracket.

### Claim 11 (depends on 8)

The swivel joint of claim 8, further comprising:
a second through hole defined inside the second body; and
a guide pipe disposed in the second through hole and supporting the relative detector,
wherein the securing bracket further includes a third protrusion formed by protruding toward a center portion of the securing through hole defined in the bracket support surface, and
the guide pipe further has a coupling groove formed at one end portion of the guide pipe and coupled to the third protrusion.

### Claim 12 (depends on 3)

The swivel joint of claim 3, further comprising:
a securing bracket configured to secure position of the relative detector,
wherein the guide pipe is characterized in that one side thereof is supported by the securing bracket and the other side thereof is detachably supported by the first body.

### Claim 13 (depends on 1)

The swivel joint of claim 1, wherein the rotation support body further comprises a hydraulic guide portion to be coupled to a hydraulic line, on an outer circumferential surface of an area of the second body protruding upward with respect to an upper body bottom surface of the upper body supported by the lower body.

### Claim 14

A construction machine comprising:
a lower body;
an upper body supported by the lower body;
a swing device disposed on the lower body to rotatably support the upper body; and
a swivel joint disposed at a center portion of the swing device, the swivel joint comprising:
a rotation support body comprising a first body supported by the lower body and a second body rotatably coupled to the first body and having one area disposed to protrude with respect to one surface of the upper body to rotate together with the upper body when the upper body rotates;
a sensor supported by the second body protruding with respect to one surface of the upper body and configured to detect rotation of the upper body; and
a hydraulic guide portion configured to couple a hydraulic line to an outer circumferential surface of an area of the second body.

### Claim 15 (depends on 14)

The construction machine of claim 14, wherein the upper body comprises:
an upper body bottom surface supported by the lower body;
a pair of upper body vertical surfaces spaced apart from each other with respect to the swivel joint, the pair of upper body vertical surfaces protruding from the upper body bottom surface and disposed to cross the upper body bottom surface; and
an upper body reinforcement surface connecting the pair of upper body vertical surfaces to each other and disposed so that an area thereof overlaps the swivel joint when viewed from above over the upper body,
wherein the sensor is detachable in an upward direction of the upper body bottom surface during maintenance of the sensor.

### Claim 16 (depends on 15)

The construction machine of claim 15, wherein the swivel joint further comprises:
a guide pipe comprising one side disposed to penetrate along a longitudinal direction of the second body, and another side detachably supported by the first body, the guide pipe detachable in a lower direction of the upper body bottom surface during maintenance of the sensor.

### Claim 17

A swivel joint for connecting hydraulic oil between a lower body of a construction machine and an upper body rotatably supported by the lower body, the swivel joint comprising,
a rotation support body comprising a first body supported by the lower body, and a second body rotatably coupled to the first body and rotating together with the upper body when the upper body rotates;
a detector having a first detection through hole defined therein, and rotating together with the second body;
a relative detector having a second detection through hole defined therein, and supported by the lower body to provide relative rotation information between the upper body and the lower body to the detector;
a second through hole defined inside the second body;
a securing bracket partially inserted inside the second detection through hole to support position of the relative detector; and
a guide pipe at least a portion of which is inserted into the second through hole, the first detection through hole, and the second detection through hole, wherein the guide pipe comprises one side supported by the securing bracket inserted into the second detection through hole and another side detachably coupled to the first body.