JPS6095189A - Starter - Google Patents

Abstract

PURPOSE:To reduce wear due to the vibration of a fulcrum shaft part by forming a pair of U-grooves, which rotatably support the arc-shaped front end part of a drive lever, having a greater diameter than that of said fulcrum shaft and also the both ends of said fulcrum shaft from the other side, on the end of a rectangular holder. CONSTITUTION:A U-shaped groove part 1a is provided on a lever holder 1, and a fulcrum shaft 2a is inserted in this groove 1 and, further, the arc-shaped front part 2b, whose diameter is greater than that of the fulcrum shaft 2a, of a drive lever 2, is formed mountably on this groove part in such a way that a minute gap can be provided between the part 2b and a front housing 3. Thereby, the arc-shaped front end part 2b is not brought in contact with a front housing 3 when a magnet switch 8 is operating, preventing a friction loss from occurring. Therefore, an arc-shaped front part 2b having a larger diameter can be employed and wear can be reduced at the time when the magnet switch is not operating.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to a starter that can be used to start an internal combustion engine.

(Prior art) In conventional devices of this type, the lever holder was generally provided with a hole that rotatably supported the fulcrum shaft of the drive lever as a fixation and fulcrum structure for the drive lever. On the other hand, with a hole, not only does it require a separate process, but the diameter of the hole and shaft must be made small in order to minimize the loss when the drive lever's fulcrum shaft rotates. This has the disadvantage that it does not cause wear due to wear.

Furthermore, as described in Japanese Utility Model Publication No. 46-35938, a groove for inserting the fulcrum shaft of the drive lever is provided in the inner wall of the front housing, and the fulcrum shaft is fixed in pressure contact with the groove of the front housing by a lever holder. There are some models in which the cylindrical projection of the drive lever is rotatably fitted into this fulcrum shaft, but this not only requires a process of fitting the cylindrical projection of the drive lever into the fulcrum, but also reduces loss during rotation. If this is attempted, there is a drawback that wear due to vibration is likely to occur between the fulcrum shaft and the cylindrical projection.

(Object of the Invention) In order to eliminate the above-mentioned drawbacks, the present invention forms an arcuate front end portion with a diameter larger than the fulcrum shaft on the front housing side of the drive lever, which is integrally formed with the fulcrum shaft, and Both ends of the fulcrum shaft can be rotated from the side opposite to the front end and held in place.By forming a pair of Ui'' holes on the tip of the 21-shaped lever holder, no special processing is required. ,
Another object of the present invention is to reduce wear due to vibration of the fulcrum shaft portion without increasing loss when rotating the drive lever.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

1 is a U-shaped lever boulder made of a resin material such as glass fiber reinforced nylon, and has a pair of U-shaped grooves 1a at its tip.
In these grooves la, both ends of a fulcrum shaft 2a integrally formed to project from the drive lever 2 are rotatably fitted. 411 Ml 44 such as glass fiber reinforced nylon
The drive lever 2 is substantially concentric with the fulcrum shaft 2a (or may not be concentric with it), and comes into contact with the front housing 3 at the front end 2b of a circular arc with a diameter of 9 threads, which is larger than the fulcrum shaft 2a. and one end is the overrunning clutch 7.
The outer 7a is rotatably engaged with the outer 7a.
Press and move a. Reference numeral 4 denotes an inner fB transfer wheel, which is integrally formed with the center bracket 9 and the lever holder 1 from a resin material such as glass fiber reinforced nylon, and is connected to the drive shaft 5 spline-coupled to the outer 7a of the overrunning clutch 7 via the shaft 12. It meshes with the attached planetary gear lO. Motor armature shaft 6
has a sun gear 6a that meshes with the planetary gear lO, and
They are rotatably connected to each other via a drive shaft 5 and a bearing 13. 8 is a magnetic switch that drives the drive lever 2 and cuts off electricity to the motor; 11;
is the yoke of the motor. Further, the drive shaft 5 is rotatably held by the center bracket 9 via a bearing 9a, and the inner 7b of the overrunning clutch 7 is formed with a binion (not shown) that meshes with the ring gear of the engine. The lever holder 1, internal gear 4, and center bracket 9 are integrally clamped and fixed by the front housing 3, the yoke 11, and the case of the magnetic switch 8.

In the above configuration, the lever holder 1 is provided with a U-shaped 1.1 part 1a, the fulcrum shaft 2a is inserted into the fila, and the arcuate front end 2b of the drive lever 2 is connected to the front housing 3 with a small gap. When the magnetic switch 8 is activated, the fulcrum shaft 2 is attached around the U groove 1a.
a rotates, and the drive lever 2 presses and moves the clutch 7 to the left in the figure to engage the pinion with the ring gear.

In addition, when the magneto switch 8 is not activated, the arcuate front end 2b comes into contact with the front 1 housing 3 by a return spring (not shown) built into the magnet switch 8, and the drive lever 2 moves as shown in FIG. -Towards the horn 1
Regulations on shuttles that cannot be used.

As described above, it is possible to achieve the same operating performance as the conventional method.

Furthermore, the arcuate n;1 end 2b does not come into contact with the front housing 3 during operation of the Macnesotos f) J8, so no loss due to friction occurs. Therefore, the arc-shaped front end portion 2b with a large diameter can be employed, and wear caused by vibrations when the magnetic switch 8 is not activated can be reduced. Therefore, the drive lever 2 and the lever holder 1 can be made of a resin material with low wear resistance.

In addition, since the lever holder l can be molded into two types, it can be integrally molded with the internal gear 4 and the center bracket 9.
It is possible to reduce the number of parts, assembly man-hours, and costs.

Note that it may be integrally molded with either the lever holder, the free gear 4, or the center bracket 9, or may be formed separately from these.

Furthermore, the present invention is not limited to those with a planetary gear reduction mechanism, but can also be applied to those with other configurations of reduction mechanisms or those without a reduction gear.

〔Effect of the invention〕

As described above, in the present invention, an arc-shaped front end portion having a diameter larger than the fulcrum shaft is formed on the front housing side of the drive lever in which the fulcrum shaft is integrally formed in a protruding manner. Since a single U-shaped groove that holds both ends of the fulcrum shaft rotatably is formed at the tip of the trowel-shaped lever, it is easy to make a hole for the lever holder and the drive lever. There is no need for the process of fitting the cylindrical protrusion into the fulcrum shaft, and when the magnet switch is activated, the fulcrum shaft with a small diameter rotates around the U-groove of the lever holder, which reduces frictional resistance and reduces rotation loss. Not only that, but when the magnetic switch is activated, the large-diameter arc-shaped front end comes into contact with the front housing, which has the excellent effect of greatly reducing friction on the fulcrum shaft caused by vibration. .

[Brief explanation of drawings]

The figure is a longitudinal cross-sectional view of the main structure of an embodiment of the starter of the present invention. l... Lever holder, la... U-shaped groove, 2... Drive lever, 2a... Fulcrum shaft, 2b... Arc shape 1
1iI end, 3... foot [2 foot housing, 6...
Motor armature shaft, 7... Overrunning clutch, 8... Magnetic switch. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] A drive lever that is integrally formed with a fulcrum shaft and has an arc-shaped oil end portion with a larger diameter than the fulcrum shaft on the front housing side, a magnetic switch that drives this drive lever, and a magnetic switch that drives the drive lever. A pinion that is driven in n8 units through a lever, a motor that rotationally drives this pinion, and n;1
A starter comprising: a U-shaped lever holder having a pair of U-shaped grooves formed at its tip to rotatably fit and hold both ends of the fulcrum shaft from the opposite side to the front end of the drive lever.