Crank angle detection device

Patent metadata

Field	Value
Publication number	US-11035698-B2
Application number	US-201916366609-A
Country	US
Kind code	B2
Filing date	Mar 27, 2019
Priority date	Mar 29, 2018
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

Provided is a crank angle detection device that includes an ACG rotor supported by an end of a crank shaft and configured to rotate integrally with the crank shaft, a metal-plate-made pulsar ring including a ring-shaped plate portion and a detected portion that includes a plurality of convex portions formed at an outer circumference of the ring-shaped plate portion, and being configured to rotate integrally with the ACG rotor with the ring-shaped plate portion fixed to the ACG rotor, and a magnetic sensor arranged at an outer circumference of the pulsar ring and configured to detect the detected portion. Such a crank angle detection device is capable of detecting a crank angle with high accuracy.

First claim

What is claimed is:

1. A crank angle detection device, comprising:
an ACG rotor supported by an end of a crank shaft and configured to rotate integrally with the crank shaft;
a metal-plate-made pulsar ring formed as a separate component from the AGC rotor and operatively attached thereto, the pulsar ring having an outer diameter larger than an outer diameter of the ACG rotor, the pulsar ring including
a ring-shaped plate portion fixed to a side face of the ACG rotor, and
a detected portion comprising a plurality of convex portions formed at an outer circumference of the ring-shaped plate portion, wherein the detected portion is bent toward the outer circumferential face of the ACG rotor in an axial direction of the crank shaft, the detected portion defining a predetermined clearance between outer end portions of the convex portions and an outer circumferential face of the ACG rotor, the pulsar ring configured to rotate integrally with the ACG rotor; and
a magnetic sensor arranged at an outer circumference of the pulsar ring and configured to detect the detected portion.

2. The crank angle detection device according to claim 1 ,
wherein a convex portion is circularly arranged at the side face of the ACG rotor concentrically with the crank shaft, the convex portion comprising a plurality of arcuate ribs integrally attached to and projecting outwardly from the side face, and
wherein an inner circumferential face of the ring-shaped plate portion is intimately contacted to an outer circumferential face of the circularly-arranged convex portion.

3. The crank angle detection device according to claim 1 , wherein:
a starter gear is arranged at the crank shaft as being adjacent to the ACG rotor, and
the pulsar ring is located between the ACG rotor and the starter gear.

4. The crank angle detection device according to claim 3 , wherein the outer diameter of the pulsar ring is larger than outer diameter of the starter gear.

5. The crank angle detection device according to claim 3 ,
wherein a one way clutch configured to transmit power from the starter gear to the crank shaft is arranged as being adjacent to the side face of the ACG rotor, and
the pulsar ring is located as overlapping in the axial direction to an outer circumference of the one way clutch.

6. The crank angle detection device according to claim 2 , wherein:
a starter gear is arranged at the crank shaft as being adjacent to the ACG rotor, and
the pulsar ring is located between the ACG rotor and the starter gear.

7. The crank angle detection device according to claim 6 , wherein the outer diameter of the pulsar ring is larger than outer diameter of the starter gear.

8. The crank angle detection device according to claim 4 , wherein
a one way clutch configured to transmit power from the starter gear to the crank shaft is arranged as being adjacent to the side face of the ACG rotor, and
the pulsar ring is located as overlapping in the axial direction to an outer circumference of the one way clutch.

9. The crank angle detection device according to claim 7 ,
wherein a one way clutch configured to transmit power from the starter gear to the crank shaft is arranged as being adjacent to the side face of the ACG rotor, and
the pulsar ring is located as overlapping in the axial direction to an outer circumference of the one way clutch.

10. The crank angle detection device according to claim 2 , wherein one of the arcuate ribs has an open notch formed therein, and the pulsar ring has a tooth thereon extending radially inward of the inner circumferential face thereof, the tooth fitting into the notch of said one of the arcuate ribs.

11. A crank angle detection device, comprising:
an ACG rotor supported by an end of a crank shaft and configured to rotate integrally therewith, the ACG rotor having a side face with a plurality of arcuate ribs integrally attached to and thereon, each of the arcuate ribs having an outer circumferential face, wherein one of the arcuate ribs has an open notch formed therein;
a metal-plate-made pulsar ring formed as a separate component from the AGC rotor and being operatively attached thereto, the pulsar ring having an outer diameter larger than an outer diameter of the ACG rotor, the pulsar ring including a ring-shaped plate portion having a circular opening formed therein with an inner circumferential face, and a tooth extending radially inward beyond the inner circumferential face, wherein the inner circumferential face is in contact with each of the outer circumferential faces of the arcuate ribs, and wherein the tooth fits into the open notch of said one of the arcuate ribs;
the pulsar ring further comprising a detected portion that includes a plurality of convex portions formed at an outer circumference of the ring-shaped plate portion, each of the convex portions being bent toward an outer circumferential face of the ACG rotor in an axial direction of the crank shaft, the pulsar ring configured to rotate integrally with the ACG rotor with the ring-shaped plate portion fixed to a side face of the ACG rotor; and
a magnetic sensor arranged at an outer circumference of the pulsar ring and configured to detect the detected portion.

12. The crank angle detection device according to claim 11 , wherein:
a starter gear is arranged at the crank shaft as being adjacent to the ACG rotor, and
the pulsar ring is located between the ACG rotor and the starter gear.

13. The crank angle detection device according to claim 12 , wherein the outer diameter of the pulsar ring is larger than outer diameter of the starter gear.

14. The crank angle detection device according to claim 12 ,
wherein a one way clutch configured to transmit power from the starter gear to the crank shaft is arranged as being adjacent to the side face of the ACG rotor, and
the pulsar ring is located as overlapping in the axial direction to an outer circumference of the one way clutch.

Assignees

• Honda Motor Co Ltd

Inventors

• Kisaichi Toru
• Okada Nozomi
• Okada Satoru

Classifications

• F02B77/08

  Safety, indicating, or supervising devices (thermal insulation F02B77/11; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00) · CPC title

• G01D5/2457

  Incremental encoders having reference marks · CPC title

• G01B7/30

  for measuring angles or tapers; for testing the alignment of axes · CPC title

• F02P7/067 Primary

  Electromagnetic pick-up devices {, e.g. providing induced current in a coil} · CPC title

• F02P7/0675

  with variable reluctance, e.g. depending on the shape of a tooth · CPC title