JP2009180152A - Starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely pull back a pinion to an anti-ring gear side when the pinion is pulled back to the anti-ring gear side in a starter for an internal combustion engine. <P>SOLUTION: This starter includes; a taking piece 7 rotatably fitted in a shift lever 6 rotatably supported by a torsion spring 5 at a center part thereof; a pinion assembly 8 including an entraining groove 8a, a flange part 8b, an end surface part 8c, and a groove bottom diameter part 8d; and a pinion shaft 9 including a pair of splines and an inner circumference part of the pinion assembly 8 in such a manner that the pinion assembly 8 can transmit rotation and slide in an axial direction. The taking piston 7 is provided with a projecting guide part 7a projecting in a direction perpendicular to a center line of a pinion shaft 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a starter for starting an internal combustion engine.

  As a starter for starting an internal combustion engine, a pinion shift mechanism using a taking piece is known (for example, Patent Document 1).

JP-A-5-52167

  The distance between the pinion center and the fulcrum where the U-shaped taking piece at the tip of the bifurcated side of the Y-shaped shift lever is turnable is limited due to restrictions for mounting the starter to the internal combustion engine. It is conceivable to employ a pinion shift mechanism of a starter that is arranged in such a way. However, in the prior art, the following matters are not sufficiently considered.

  The pinion moves in parallel with the pinion shaft center line, and the taking piece moves on the circular arc track centered on the rotation fulcrum of the shift lever, so at the pinion maximum projecting position where the pinion is most pushed out to the ring gear side, the pinion The distance between the pinion and the taking piece is the longest in the direction perpendicular to the shaft center line.

  On the other hand, since the taking piece can rotate (fall down), the taking piece can freely move (fall down) at the pinion maximum projecting position.

  A collar that forms an entrainment groove in which the taking piece falls and the taking piece is placed when the distance between the pinion and the taking piece becomes excessive due to restrictions on mounting the starter to the internal combustion engine, etc. There is a possibility that the taking piece does not catch on the buttocks and the pinion cannot be pulled back when trying to pull the pinion back to the anti-ring gear side by getting on or off the buttocks.

  The object of the present invention is to make sure that the taking piece is hooked on the buttocks in the moving range of the pinion and the taking piece on the moving track even in the above case, and when the pinion is going to be pulled back to the anti-ring gear side, The purpose is to reliably pull the pinion back to the non-ring gear side.

  The present invention is a starter in which the taking piece is provided with a protruding guide portion protruding in a direction perpendicular to the center line of the pinion shaft.

  According to the present invention, when the pinion is to be pulled back to the side opposite to the ring gear, the pinion can be reliably pulled back.

  The embodiment described below relates to a starter for starting an internal combustion engine, and relates to a pinion shift mechanism having a function of pushing out a pinion to a ring gear side through a shift lever and a taking piece and pulling the pinion back to the non-ring gear side.

  Embodiments of the present invention will be described below with reference to the left half of FIGS. In order to facilitate understanding of the contents of the embodiment of the present invention, description will be made with reference to the right half of FIGS.

  First, the configuration of the pinion shift mechanism will be described.

  The pinion shift mechanism according to the embodiment of the present invention is rotated around a Y-shaped shift lever 6 rotatably supported by a support point A of a torsion spring 5 and a fulcrum B provided at a Y-shaped bifurcated tip. A taking piece 7 in which a metal wire is bent into a U-shape that is movably fitted, an encasing groove 8a in which the taking piece 7 is disposed, a flange 8b, an end face 8c, and a groove bottom diameter constituting the encasing groove 8a A pinion assembly 8 having a portion 8d, a spline (not shown) on the inner periphery of the pinion assembly 8 and a pair of splines so that rotation is transmitted to the pinion assembly 8 and the pinion assembly 8 is slidable in the axial direction. The pinion shaft 9, the front housing 2 that rotatably supports the end of the pinion shaft 9, and the plastic that is hooked on the other end of the shift lever 6 Ja 4, constituted by a solenoid (not shown) disposed on the outer periphery of the plunger 4.

  Next, the operation of the pinion shift mechanism will be described.

  When the key SW (not shown) is turned ON, the plunger 4 pulls the end of the shift lever 6 in the C direction by the electromagnetic force of a solenoid (not shown), and the Y-shaped bifurcated tip of the shift lever 6 is the crank of the internal combustion engine. Since it moves toward the ring gear 3 fitted to the shaft, the taking piece 7 pushes the end face 8c, the pinion assembly 8 is pushed out and meshed with the ring gear 3 (pinion maximum projecting position), and almost simultaneously with the motor 1 The armature (not shown) rotates, and the rotation is transmitted from the pinion shaft 9 → the pinion assembly 8 → the ring gear 3 → the crankshaft to start the internal combustion engine. Until it is confirmed that the internal combustion engine is started, the taking piece 7 and the entraining groove 8a, the flange portion 8b, the end surface portion 8c, the groove at the moment when the pinion assembly 8 and the ring gear 3 are engaged with each other (the pinion maximum projecting position) The positional relationship of the bottom diameter portion 8d is maintained.

  When the key SW is returned to the starter OFF after confirming that the internal combustion engine has started, the electromagnetic force of the solenoid disappears, and the plunger 4 pushes the end of the shift lever 6 back in the D direction by the force of a pinion return spring (not shown). Since the Y-shaped bifurcated end of the shift lever 6 moves to the opposite ring gear side by the lever operation, the pinion assembly 8 is pulled back while the taking piece 7 is hooked on the flange 8b.

  The trajectory of each part during the series of pinion shift operations as described above is such that the trajectory of the pinion assembly 8 is on the pinion shaft center line E, and the trajectories of the fulcrum B and the taking piece 7 are on the arc F centered on the support point A. It is.

  For this reason, at the pinion maximum projecting position, the distance between the taking piece 7 and the entraining groove 8a, the flange portion 8b, the end surface portion 8c, and the groove bottom diameter portion 8d is the longest.

  Further, since the taking piece 7 is pivotably fitted to the fulcrum B and can be freely tilted, in the conventional example, the distance between the taking piece 7 and the entraining groove 8a is separated when the pinion is in the maximum projecting position. If it is too much, it will be possible to fall down until it is disengaged from the entrainment groove 8a like the taking piece 7 'in FIG. If it falls off, the pinion cannot be shifted. Even if it is not completely disengaged, if the distance is too far, there is a possibility that it will fall down to a state where it is sandwiched between the flange portion 8b and the end surface portion 8c (that is, the taking piece 7 rides on the flange portion 8b). is there. If it falls to this state, even if it tries to pull back the pinion assembly 8, the taking piece 7 cannot return to the normal state of the normal flange portion 8b and the end face portion 8c, and the pinion assembly 8 is pulled back. I can't.

  In the pinion shift mechanism of the present embodiment, the taking piece 7 is provided with a protruding guide portion 7a protruding in a direction perpendicular to the pinion shaft center line E. Further, while the taking piece 7 moves along the arc F, the protruding guide portion is provided. The tip of 7a is set so as to always protrude from the pinion shaft center line E. As shown in FIG. 2, the taking piece 7 has a fulcrum part 7b fitted to the shift lever 6 and a U-shaped bottom part 7c corresponding to the U-shaped bottom of the taking piece 7, and the fulcrum part 7b Between the U-shaped bottom portion 7c, a protruding guide portion 7a extending to the opposite side to the U-shaped bottom portion 7c is provided. As a result, the distance between the taking piece 7 and the entraining groove 8a is the longest, and the pinion maximum flight in which the positional relationship among the taking piece 7 and the entraining groove 8a, the flange portion 8b, the end surface portion 8c, and the groove bottom diameter portion 8d is maintained. Even in the extended position, the possible tilting angle of the taking piece 7 can be kept small, and the taking piece 7 does not come out of the entraining groove 8a, and the taking piece 7 does not get on the collar 8b. That is, a reliable pinion shift function operation can be realized by the starter.

  In addition, it is also possible to manufacture the taking piece 7 by resin molding, and even in that case, the same functions and effects as in the above-described embodiment can be obtained.

1 is a structural diagram of a pinion shift mechanism that constitutes an embodiment of the present invention. FIG. 1 and FIG. 3 show II views when the pinion is fully projected (the pinion shaft is not shown). The structure of the conventional pinion shift mechanism is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Front housing 3 Ring gear 4 Plunger 5 Torsion spring 6 Shift lever 7 Taking piece 7a Protrusion guide part 8 Pinion assembly 8a Engaging groove 8b Eave part 8c End surface part 8d Groove bottom diameter part 9 Pinion shaft A Support point B Support point C, D Plunger moving direction E Pinion shaft center line (orbit of pinion assembly)
F Circular arc (trajectory of support hole B)

Claims (5)

A Y-shaped shift lever supported substantially at the center by a torsion spring, and
A U-shaped taking piece rotatably fitted to the Y-shaped bifurcated tip;
A pinion assembly having an entraining groove in which the taking piece is disposed, and a flange portion, an end surface portion, and a groove bottom diameter portion constituting the entraining groove;
A pinion shaft that transmits rotation to the pinion assembly and has an inner peripheral portion of the pinion assembly and a pair of splines so that the pinion assembly is slidable in the axial direction;
A plunger hooked to the other end of the shift lever;
A solenoid disposed on an outer periphery of the plunger,
The pinion assembly is pushed out to the ring gear side fitted to the crankshaft of the internal combustion engine by the electromagnetic force of the solenoid, and the shift operation of pulling back the pinion assembly to the side opposite to the ring gear by the force of the spring is performed. The taking piece moves on an arc orbit centering on a pivotal fulcrum of the shift lever, and the pinion assembly is a starter that moves in parallel with the pinion shaft center line,
A starter provided with a protruding guide portion protruding in a direction perpendicular to the center line of the pinion shaft on the taking piece. The starter according to claim 1,
During the shift operation, a starter in which a leading end of the protruding guide portion of the taking piece that moves on an arc orbit centering on a rotation fulcrum of the shift lever protrudes from the pinion shaft center line. The starter according to claim 1,
The taking piece is a starter that is a bent metal wire. The starter according to claim 1,
The taking piece is a starter which is a molded resin. A Y-shaped shift lever supported substantially at the center by a torsion spring, and
A U-shaped taking piece rotatably fitted to the Y-shaped bifurcated tip;
A pinion assembly having an entraining groove in which the taking piece is disposed, and a flange portion, an end surface portion, and a groove bottom diameter portion constituting the entraining groove;
A pinion shaft that transmits rotation to the pinion assembly and has an inner peripheral portion of the pinion assembly and a pair of splines so that the pinion assembly is slidable in the axial direction;
A plunger hooked to the other end of the shift lever;
A solenoid disposed on an outer periphery of the plunger,
The taking piece extends to the opposite side of the U-shaped bottom portion between the fulcrum portion fitted to the shift lever, the U-shaped U-shaped bottom portion, and the fulcrum portion and the U-shaped bottom portion. A starter having a protruding guide;

Images