Sealing structure for cover made of resin

Patent metadata

Field	Value
Publication number	US-11668397-B2
Application number	US-201917059167-A
Country	US
Kind code	B2
Filing date	Aug 9, 2019
Priority date	Aug 28, 2018
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

A sealing structure for a front cover of an engine includes a front cover made of resin of an engine in which a through-hole, into which a boss part of a torsional damper is to be inserted, is provided, and a sealing apparatus to seal between the through-hole of the front cover and the shaft part. The sealing apparatus includes a support ring that is made of resin and has an annular shape, and an elastic body part that is made of an elastic material, has an annular shape and is attached to the support ring. The elastic body part has an annular seal lip that contacts the shaft part such that the shaft part is able to slide, and the support ring is bonded to the front cover.

First claim

The invention claimed is:

1. A sealing structure for a cover made of resin, the sealing structure comprising:
the cover made of resin, which has a through-hole into which a shaft part is to be inserted; and
a sealing apparatus to seal between the through-hole of the cover and the shaft part,
wherein the sealing apparatus includes a support ring that is made of resin and has an annular shape about an axis, and an elastic body part that is made of an elastic material, has an annular shape about the axis, and is attached to the support ring,
in a direction of the axis, an inner side is a direction toward an inside of the cover and an outer side is a direction away from the inside of the cover,
the elastic body part has an annular seal lip that contacts the shaft part such that the shaft part is able to slide, and
the support ring has an insert part which is an annular part that is to be inserted into the through hole, an outer side part which is an annular part that protrudes to the outer side from the through-hole and toward the outer side beyond the insert part, and a bonding part which is formed at the outer side part and has a surface that is annular about the axis and faces to the inner side,
wherein the insert part extends along the axis and has an outer circumferential surface facing an outer periphery side,
wherein the outer circumferential surface is spaced apart from an inner circumferential surface of the cover and terminates at an end portion having a diameter that is equal to a diameter of the inner circumferential surface of the cover, and
wherein the boding part is bonded by welding to the cover.

2. The sealing structure for a cover made of resin according to claim 1 , the outer circumferential surface of the insert part being a tapered surface having a diameter that decreases from the outer side toward the inner side in the direction of the axis.

3. The sealing structure for a cover made of resin according to claim 1 , the outer side part having a welding jig guide part which is an annular recessed part that is recessed from the outer side toward the inner side.

4. The sealing structure for a cover made of resin according to claim 1 , a damper pulley as a torsional damper being positioned on the outside of the sealing apparatus, and a labyrinth seal being provided between the support ring and the damper pulley.

5. The sealing structure for a cover made of resin according to claim 4 , the damper pulley having an annular protrusion that is to be positioned in the welding jig guide part,
wherein the labyrinth seal is formed between the protrusion part and the welding jig guide part.

6. The sealing apparatus according to claim 1 ,
the support ring being an annular member made of resin, and
the elastic body part being made of an elastic material attached to the support ring,
wherein the elastic body part is integrally formed with the support ring so as to cover an inner periphery side of the support ring and has the seal lip, and
wherein the support ring has a welding jig guide part formed on an annular side surface orthogonal to the axis, the welding jig guide part being an annular recessed part that is recessed along the axis.

7. The sealing apparatus according to claim 6 , the support ring having a bonding surface which is annular about the axis and faces the inner side in the direction of the axis x and an annular projection part that protrudes toward the inner side from the bonding surface in the direction of the axis.

8. The sealing apparatus according to claim 7 , the support ring having an annular recessed part recessed from the bonding surface in the direction of the axis that is formed at least in any of an inner periphery side or an outer periphery side of the projection part.

Assignees

• Nok Corp

Inventors

• SHONAI Shiho
• Sugihara Hiromi
• Hamamoto Kokichi
• Nishimura Tomoaki

Classifications

• B29C66/53245

  said articles being hollow · CPC title

• B29C66/131

  Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area · CPC title

• B29L2031/749

  Motors · CPC title

• B29C65/16

  Laser beams · CPC title

• B29C65/06

  using friction, e.g. spin welding {(non-plastics elements to plastic elements B29C65/645)} · CPC title