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US 7,798,296 B2Granted
Damper device and manufacturing method for damper device
AssigneeNidec Sankyo Corporation
InventorHiroyuki Iwashita
Life of this patent
Estimating the term…
Abstract
A damper device having a casing with a cylindrical inner circumferential surface, a shaft body located in the cylindrical space of the casing and supported in a freely turnable manner, a cover which seals the casing, and viscous fluid stored in a sealed space formed between the shaft body and the casing. The casing is provided with a first engagement part and a second engagement part which engage with the cover, and the cover is welded with the first engagement part by ultrasonic welding and positioned by the second engagement part which is used as a positioning part in an axial direction for the cover.
Claims8
A damper device comprising:
- a casing comprising a cylindrical inner circumferential surface and an opening;
- a shaft body located in a cylindrical space of the casing and supported in a freely turnable manner;
- a cover adapted for sealing the casing;
- viscous fluid which is stored in a sealed space formed between the shaft body and the casing;
- and
- a metal washer disposed between the casing and the cover;
- wherein the metal washer is made of material different from the cover;
- wherein the cylindrical inner circumferential surface of the casing comprises:
- a first inner circumferential surface which forms the sealed space in which the viscous fluid is stored;
- a second inner circumferential surface which faces a large diameter part of the shaft body;
- and
- a third inner circumferential surface along which an insert part formed in the cover is inserted into the casing;
- wherein the casing further comprises:
- a first engagement part which (1) is formed on an axially facing surface of a step on the third inner circumferential surface of the casing, (2) engages with the cover, and (3) is used as an ultrasonically welded part with the cover;
- and
- a second engagement part which is formed on an axially facing surface of a step between the second inner circumferential surface and the third inner circumferential surface of the casing at a position, in an axial direction of the shaft body, so as to be further from the opening of the casing than the first engagement part, and which is used as a positioning part in the axial direction for the cover;
- wherein the shaft body further comprises:
- a large diameter part which is positioned, in the axial direction, so as to be further from the opening of the casing than the second engagement part of the casing;
- and
- an O-ring for sealing is disposed between the second inner circumferential surface of the casing and the large diameter part of the shaft body;
- and
- wherein the metal washer is disposed between the second engagement part of the casing and the cover, so that a position of the cover, in the axial direction, is determined by the second engagement part of the casing via the metal washer when the first engagement part is ultrasonically welded with the cover.
19 more elements
A damper device comprising:
- a casing comprising a cylindrical inner circumferential surface and an opening;
- a shaft body positioned in a cylindrical space of the casing;
- a cover adapted for sealing the casing;
- and
- a metal washer disposed between the casing and the cover,
- wherein the metal washer is made of material different from the cover;
- wherein the cylindrical inner circumferential surface of the casing comprises:
- a first inner circumferential surface which forms the sealed space in which the viscous fluid is stored;
- a second inner circumferential surface which faces a large diameter part of the shaft body;
- and
- a third inner circumferential surface along which an insert part formed in the cover is inserted into the casing;
- wherein the casing further comprises:
- a first engagement part which (1) is formed on an axially facing surface of a step on the third inner circumferential surface of the casing, (2) engages with the cover, and (3) is used as an ultrasonically welded part with the cover;
- and
- a second engagement part which is formed on an axially facing surface of a step between the second inner circumferential surface and the third inner circumferential surface of the casing at a position, in an axial direction of the shaft body, so as to be further from the opening of the casing than the first engagement part, and which is used as a positioning part in the axial direction for the cover;
- wherein the shaft body further comprises:
- a large diameter part which is positioned, in the axial direction, so as to be further from the opening of the casing than the second engagement part of the casing;
- and
- an O-ring for sealing is disposed between the second inner circumferential surface of the casing and the large diameter part of the shaft body;
- and
- wherein the metal washer is disposed between the second engagement part of the casing and the cover, so that a position of the cover, in the axial direction, is determined by the second engagement part of the casing via the metal washer when the first engagement part is ultrasonically welded with the cover.
18 more elements
Dependencies are inferred from the claim text.