Engine startup device

Patent metadata

Field	Value
Publication number	US-9670892-B2
Application number	US-201214378713-A
Country	US
Kind code	B2
Filing date	May 17, 2012
Priority date	May 17, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

An engine startup device is provided having a helical-spline-engaging part where an output shaft ( 5 ) and a moving body ( 3 ) are coupled with each other, wherein a notch ( 37 b, 38 b ) is formed on a power-transmitting-side tooth surface ( 37 a, 38 a ) of at least either one of the output shaft and the moving body, and an angle formed by the notch with respect to a shaft direction is made smaller than the lead angle of a helical spline.

First claim

The invention claimed is:

1. An engine startup device, comprising:
a motor that produces torque with electric power supplied thereto;
an output shaft on which is formed a first helical spline that transmits the torque from the motor;
a moving body that has a second helical spline engaging with the output shaft and transmits the torque from the motor to an engine side; and
an electromagnetic switch equipped with a mechanism that independently performs a function of magnetizing a motor-operating plunger by activating a motor-operating solenoid coil and switching on/off the power to the motor by the movement of the motor-operating plunger, and a function of magnetizing a moving-body-operating plunger by activating a moving-body-operating solenoid coil and thrusting out the moving body towards a ring gear side via a thrust-out mechanism by the movement of the moving-body-operating plunger; wherein
a notch is formed on a power-transmitting-side tooth surface of at least one from among the first helical spline and the second helical spline of the output shaft and the moving body, and the helical splines of the output shaft and the moving body are arranged in such a way that the notch of the either one of the output shaft and the moving body engages with part of the helical spline of the other when the engine startup device stopping.

2. An engine startup device according to claim 1 , wherein an angle formed by the notch with respect to a motor shaft direction is smaller than the lead angle of the helical splines.

3. An engine startup device according to claim 2 , wherein the notch overlaps in the motor shaft direction the rear end of the first helical spline of the output shaft or the front end of the second helical spline of the moving body.

4. An engine startup device according to claim 3 , wherein a surface of the notch is parallel to the power-transmitting-side tooth surface or is formed in an involute curve.

5. An engine startup device according to claim 4 , wherein an angle formed by the surface of the notch is larger than a transverse pressure angle of the helical splines with reference to the transverse gear center of the helical splines.

Assignees

• Abe Masami
• Kamei Koichiro
• Odahara Kazuhiro
• Mitsubishi Electric Corp

Inventors

• Abe Masami
• Kamei Koichiro
• Odahara Kazuhiro

Classifications

• H01H51/065

  Relays having a pair of normally open contacts rigidly fixed to a magnetic core movable along the axis of a solenoid, e.g. relays for starting automobiles (details H01H50/20) · CPC title

• F02N11/087 Primary

  Details of the switching means in starting circuits, e.g. relays or electronic switches · CPC title

• F02N2015/061

  said axial displacement being limited, e.g. by using a stopper · CPC title

• F02N2011/0874

  characterised by said switch being an electronic switch · CPC title

• F02N15/022

  the starter comprising an intermediate clutch · CPC title