Rotation transfer apparatus provided with torque measuring device

Patent metadata

Field	Value
Publication number	US-10994607-B2
Application number	US-201616065573-A
Country	US
Kind code	B2
Filing date	Sep 29, 2016
Priority date	Dec 25, 2015
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

First and second encoders are fixed to a drive plate and a clutch cover of which the center portions are connected to each other via a connection shaft and which are disposed between, in a transfer path for torque outputted from an engine, a damper and a connecting/disconnecting part of a clutch mechanism of a transmission. At the same time, detection units of first and second sensors are opposed to portions to be detected of the first and second encoders, respectively.

First claim

The invention claimed is:

1. A rotation transmission apparatus with a torque measurement device, comprising:
a pair of rotary bodies which are provided in series with each other along a transmission path at a part between a damper for absorbing rotation fluctuation of an engine and a connection/disconnection portion of a clutch mechanism of a transmission in a transmission path of output torque of the engine from a crankshaft of the engine to a transmission mechanism of the transmission;
a connection member which coaxially connects the pair of rotary bodies at rotation centers thereof so as to transmit torque;
a first encoder which is fixed to one of the pair of rotary bodies and includes a detected portion which alternately changes characteristics in a circumferential direction;
a second encoder which is fixed to the other of the pair of rotary bodies and includes a detected portion which alternately changes characteristics in a circumferential direction;
a first sensor which is supported on a part which is non-rotatable during use while a detecting portion of the first sensor faces the detected portion of the first encoder, and is configured to change an output signal according to a characteristic change of the detected portion of the first encoder which faces the detecting portion of the first sensor; and
a second sensor which is supported on a part which is non-rotatable during use while a detecting portion of the second sensor faces the detected portion of the second encoder, and is configured to change an output signal according to a characteristic change of the detected portion of the second encoder which faces the detecting portion of the second sensor,
wherein the output torque of the engine is measured based on a phase difference between the output signals of the first sensor and the second sensor.

2. The rotation transmission apparatus according to claim 1 ,
wherein the damper is disposed between a flywheel coupled to the crankshaft and the one of the pair of rotary bodies.

3. The rotation transmission apparatus according to claim 2 ,
wherein the other of the pair of rotary bodies is a bottom plate portion of a cylindrical clutch cover having a bottom in which a tubular portion is provided on an opposite surface of a surface facing the one of the pair of rotary bodies, and
wherein the connection/disconnection portion of the clutch mechanism is configured by a clutch plate disposed inside the tubular portion of the clutch cover and a connection/disconnection switch which is configured to connect and disconnect torque transmission from an inside of the tubular portion to the clutch plate.

4. The rotation transmission apparatus according to claim 3 ,
wherein the clutch plate includes a first clutch plate and a second clutch plate, and the first clutch plate and the second clutch plate are disposed coaxially with the clutch cover in a state of being separated from each other.

5. The rotation transmission apparatus according to claim 4 ,
wherein one end of a first input shaft extending to the transmission mechanism is supported so as to transmit torque on a center portion of the first clutch plate disposed on a side close to the bottom plate portion,
wherein one end of a second input shaft which is a hollow shaft extending to the transmission mechanism is supported so as to transmit torque on a center portion of the second clutch plate disposed on a side far from the bottom plate portion, and
wherein an axially intermediate portion of the first input shaft is inserted into a radially inner side of the hollow shaft which is the second input shaft extending to the transmission mechanism.

6. The rotation transmission apparatus according to claim 1 ,
wherein each of the detected portions of the first encoder and second encoder is disposed with S poles and N poles alternately at equal pitches in the circumferential direction, and
wherein a magnetic detection element is disposed in each of the detecting portions of the first sensor and second sensor.

Assignees

• Nsk Ltd

Inventors

• Ishibashi Teruaki
• SODA Fumiaki

Classifications

• F16H2003/0931

  each countershaft having an output gear meshing with a single common gear on the output shaft · CPC title

• F16H2200/0043

  the gear ratios comprising four forward speeds · CPC title

• B60K17/02 Primary

  characterised by arrangement, location, or kind of clutch · CPC title

• B60K17/08

  of mechanical type · CPC title

• G01L3/101

  involving magnetic or electromagnetic means · CPC title