Prevention of performance falsification of a turbocharger

Patent metadata

Field	Value
Publication number	US-11085365-B2
Application number	US-202017131918-A
Country	US
Kind code	B2
Filing date	Dec 23, 2020
Priority date	Jul 10, 2018
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A falsification prevention structure is to prevent falsification of the performance of a turbocharger. A bearing housing of the turbocharger has a flow rate adjustment screw which is operated to adjust a turbine flow rate of the turbocharger. The falsification prevention structure includes a cover member which is fastened to a flange portion of the bearing housing by a fixing bolt and which covers the flow rate adjustment screw, and a cap which is mounted in an irremovable manner with respect to the cover member and which blocks a bolt hole.

First claim

The invention claimed is:

1. An apparatus for preventing performance falsification of a turbocharger, the apparatus comprising:
a main body;
an adjuster which is mounted on the main body and configured to adjust the performance of the turbocharger;
a cover member which is fastened to the main body by a fastener through a fastening hole on the cover member, and houses at least a portion of the adjuster; and
a lid which is mounted on the cover member in a tamper-proof manner and closes the fastening hole.

2. The apparatus according to claim 1 , wherein the lid is disposed with a gap between the fastening hole so as to be rotatably mounted with respect to the cover member.

3. The apparatus according to claim 1 , wherein the lid is disposed with a gap between the fastener.

4. The apparatus according to claim 1 , wherein the lid is made of a material which has been subjected to a hardening treatment.

5. The apparatus according to claim 1 , wherein the lid is made of a first material having a higher hardness than a second material of the cover member.

6. The apparatus according to claim 1 , wherein at least a part of the lid is inserted into the fastening hole in an axial direction of the fastening hole.

7. The apparatus according to claim 1 , wherein the lid is completely inserted into the fastening hole in an axial direction of the lid.

8. The apparatus according to claim 1 , wherein an upper end surface of the lid which is inserted into the fastening hole is located lower than a surface of the cover member.

9. The apparatus according to claim 1 , wherein an upper end surface of the lid which is inserted into the fastening hole is located higher than a surface of the cover member.

10. The apparatus according to claim 1 , wherein the adjuster is a screw for adjusting the performance of the turbocharger.

11. The apparatus according to claim 1 , wherein the adjuster is a rivet for adjusting the performance of the turbocharger.

12. The apparatus according to claim 1 , wherein the adjuster is a pin for adjusting the performance of the turbocharger.

13. The apparatus according to claim 1 , wherein the adjuster is configured to adjust a turbine flow rate of the turbocharger.

14. The apparatus according to claim 1 , wherein the adjuster is configured to adjust a compressor flow rate of the turbocharger.

15. The apparatus according to claim 1 , further comprising a retaining ring which is disposed between the lid and the fastening hole and configured to pressure-fit the lid in the fastening hole.

16. The apparatus according to claim 15 , wherein the retaining ring is C-shaped.

17. The apparatus according to claim 15 ,
wherein the lid comprises a ring mounting groove on an outer surface which extends in a circumferential direction of the lid,
wherein the fastening hole comprises a ring fitting groove on an inner wall of the fastening hole in the circumferential direction, and
wherein the retaining ring is disposed in the ring mounting groove and the ring fitting groove so as to pressure-fit the lid in the fastening hole.

18. The apparatus according to claim 17 ,
wherein the fastening hole comprises:
a large-diameter hole portion located on a side of an inlet into which the fastener is inserted;
a small-diameter hole portion which is located closer to the fastener than the large-diameter hole portion and has a smaller diameter than the large-diameter hole portion,

wherein the ring fitting groove is formed at a boundary between the large-diameter hole portion and the small-diameter hole portion, and
wherein the lid comprises:
a large-diameter body portion which is inserted into the large-diameter hole portion;
a small-diameter body portion which is inserted into the small-diameter hole portion and has a smaller diameter than the large-diameter body portion, and

wherein a ring mounting groove is formed at a boundary between the large-diameter body portion and the small-diameter body portion.

19. The apparatus according to claim 18 , wherein an outer diameter of the retaining ring is larger than an inner diameter of the large-diameter hole portion.

20. A method of manufacturing an apparatus for preventing performance falsification of a turbocharger, the method comprising:
mounting an adjuster on a main body, wherein the adjuster is configured to adjust the performance of the turbocharger;
fastening a cover member to the main body by a fastener through a fastening hole on the cover member, wherein the cover member houses at least a portion of the adjuster; and
mounting a lid on the cover member in a tamper-proof manner, wherein the lid closes the fastening hole.

Assignees

• Ihi Corp

Inventors

• Yoshida Yoshinari
• Nishioka Masaru
• SUGIU Nobuaki
• NISHIGUCHI Ikuma
• Furuta Satoru

Classifications

• F16B2200/30

  Dovetail-like connections · CPC title

• F16B41/005 Primary

  Measures against unauthorised operation of bolts, nuts or pins (F16B23/0007, F16B23/0061, F16B23/0069, F16B23/0076 and F16B31/02 take precedence; locks, keys E05B; for valves, taps or cocks F16K35/00; for pipe-joints with swivel-nuts F16L19/005) · CPC title

• F02B37/18 Primary

  by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} · CPC title

• F16B5/004

  and using C-shaped clamps · CPC title

• F16B21/183

  internal, i.e. with spreading action · CPC title