Shaft ground ring to prevent bearing electrical erosion
AssigneesHj Tong Sang Co., Ltd., Han Jin Trading & Engineering Co., Ltd.
InventorsMin Hun Kim, Sung Yuhp Han
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Abstract
A shaft ground ring and an assembly thereof are disclosed. According to the present invention, there is provided a shaft ground ring fastened to a shaft of an electric motor to prevent electrical erosion caused by a leakage current, the shaft ground ring including a ring body formed to extend to surround an outer circumferential surface of the shaft and a plurality of ground protrusions formed to protrude from an inner circumferential surface of the ring body, being in contact with the outer circumferential surface of the shaft, and disposed to be spaced a predetermined gap from each other along the ring body. The present invention maintains a proper ground state in an oil cooled environment and thus can properly function a high-capacity electric motor.
Claims10
A shaft ground ring fastened to a shaft (10) of an electric motor to prevent electrical erosion caused by a leakage current, the shaft ground ring comprising:
- a ring body (121) formed to extend to surround an outer circumferential surface of the shaft (10);
- and
- a plurality of ground protrusions (122) formed to protrude from an inner circumferential surface of the ring body (121), being in contact with the outer circumferential surface of the shaft (10), and disposed to be spaced a predetermined gap (G1) from each other along the ring body (121),
- wherein each of the ground protrusions (122) includes:
- a longitudinal extension (122g) extending from the ring body (121) toward the shaft (10), and
- a lateral extension (122h) extending from an end portion of the longitudinal extension (122g) in a forward or rearward direction and formed to obliquely extend to approach a central axis (S1) of the shaft (10) in an initial state of not being in contact with the shaft (10), and
- wherein the lateral extension (122h) includes:
- a first contact point (122a) in contact with one side of the outer circumferential surface of the shaft (10),
- a second contact point (122b) disposed to be spaced apart from the first contact point (122a) in a front-rear direction, and
- a first flow path (122f) formed between the first contact point (122a) and the second contact point (122b) in a circumferential direction by elastically deforming the lateral extension (122h) according to installation of the shaft (10).
A shaft ground ring fastened to a shaft (10) of an electric motor to prevent electrical erosion caused by a leakage current, the shaft ground ring comprising:
- a ring body (121) formed to extend to surround an outer circumferential surface of the shaft (10);
- and
- a plurality of ground protrusions (122) formed to protrude from an inner circumferential surface of the ring body (121), being in contact with the outer circumferential surface of the shaft (10), and disposed to be spaced a predetermined gap (G1) from each other along the ring body (121),
- wherein the ground protrusions include:
- a plurality of first ground protrusions (223), and
- a plurality of second ground protrusions (224) alternately repeatedly disposed with the plurality of first ground protrusions (223),
- wherein each of the first ground protrusions (223) includes a first longitudinal extension (223a) extending from the ring body and a first lateral extension (223b) extending forward from an end portion of the first longitudinal extension (223a), and
- each of the second ground protrusions (224) includes a second longitudinal extension (224a) extending from the ring body and a second lateral extension (224b) extending rearward from an end portion of the second longitudinal extension (224a),
- wherein each of the first ground protrusions and the second ground protrusions includes:
- a longitudinal extension extending from the ring body toward the shaft, and
- a lateral extension extending from an end portion of the longitudinal extension in a forward or rearward direction and formed to obliquely extend to approach a central axis of the shaft in an initial state of not being in contact with the shaft, and
- wherein the lateral extension includes:
- a first contact point in contact with one side of the outer circumferential surface of the shaft,
- a second contact point disposed to be spaced apart from the first contact point in a front-rear direction, and
- a first flow path formed between the first contact point and the second contact point in a circumferential direction by elastically deforming the lateral extension according to installation of the shaft.
A shaft ground ring fastened to a shaft (10) of an electric motor to prevent electrical erosion caused by a leakage current, the shaft ground ring comprising:
- a ring body (121) formed to extend to surround an outer circumferential surface of the shaft (10);
- and
- a plurality of ground protrusions (122) formed to protrude from an inner circumferential surface of the ring body (121), being in contact with the outer circumferential surface of the shaft (10), and disposed to be spaced a predetermined gap (G1) from each other along the ring body (121),
- wherein each of the ground protrusions includes:
- a first contact point (322a) and a fourth contact point (322d) spaced apart from each other in a circumferential direction of the shaft and being in contact with the outer circumferential surface of the shaft to form a second flow path (322e) between the first contact point (322a) and the fourth contact point (322d) in a front-rear direction, and
- guide grooves (322i, 322i′) formed so that a front surface and a rear surface of the ground protrusion are concavely recessed at a connection portion with the ring body and configured to induce elastic deformation in a forward or rearward direction when the shaft is inserted into and fastened to the shaft ground ring.
Dependencies are inferred from the claim text.