JPS633431Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pinion transfer device for a starter (starting motor). A schematic configuration of a conventional device of this type is shown in FIG. In this FIG. 1, code 1 is a starter;
2 is a DC motor screwed onto the front bracket 3 with a through bolt (not shown); 4 is a rotating shaft 5;
The armature of the DC motor is supported by a sleeve bearing 6, and the armature 7 is engaged with a spline so that it can be slid back and forth on the rotating shaft 5. Running clutch, 9 is the clutch outer 10 of this clutch.
The washer 11 is fitted into the middle part with the pivot 11
The shift lever is pivoted by a, and one end thereof is engaged with the clutch outer 10. Further, 12 is an electromagnetic switch that engages the plunger 13 with the other end of the shift lever 11 and is screwed to the front bracket 3; 14 is a holder that supports the shift lever 11 and is held by a lever spring 15; 16 is a holder that supports the shift lever 11; This spring 15
A grommet 17 forms a pressure-receiving bottom surface and has a sealing function for the device; 17 is a stopper ring-locked to the rotating shaft 5 so as to receive pressure from the forward protrusion of the pinion 8; 18 is a stepped portion 5a of the rotating shaft 5; A thrust washer 19, which is clamped between the front end inner circumferential surface of the front bracket 3 and the front bracket 3, is a ring gear of the internal combustion engine that engages the pinion 8. Therefore, in this conventional configuration, when the electromagnetic switch 12 is energized, the shift lever 11 is rotated counterclockwise in the figure via the plunger 13, and the overrunning clutch 7 is moved onto the rotating shaft 5. Move the pinion 8 forward to the ring gear 1.
Engage with 9. After that, the electromagnetic switch 12
When a built-in main contact (not shown) is closed, the DC motor 2 is energized and the armature 4 is driven to rotate. This rotational force is transmitted to the overrunning clutch 7 via the spline on the rotating shaft 5, and the pinion 8, which is rotationally engaged in one direction with the overrunning clutch 7, starts, or cranks, the ring gear 19, thereby causing internal combustion. Start the engine, and after starting the engine, turn the electromagnetic switch 12
When the energization is released, the plunger 13 returns to its original position, and the overrunning clutch 7 is returned to the rear via the shift lever 11, thereby coming to rest again in the state shown in the figure. However, in the case of such a conventional device, since the shift lever 11 is in sliding contact with the clutch outer 10 of the overrunning clutch 7 and the washer 9 every time it is operated, as described above, the wear phenomenon caused by mechanical friction is prevented. At the same time, the rotational output of the device is reduced due to mechanical friction loss. This invention provides a non-contact structure between the shift lever and the overrunning clutch in order to overcome these drawbacks of the conventional device. Hereinafter, one embodiment of the pinion transfer device according to this invention will be described in detail with reference to FIGS. 2a, b, and c and FIG. 3. In the embodiments shown in FIGS. 2a, b, and c and in FIG. 3, the same reference numerals as in the conventional example shown in FIG. 1 indicate the same or corresponding parts. Also, 20 is a starter,
Reference numeral 21 denotes an overrunning clutch that is engaged with the rotating shaft 5 by a helical spline; 22 a non-magnetic frame 24 fixed to the clutch outer 23 of the overrunning clutch 21 ;
A permanent magnet body 26 consists of a ferrite permanent magnet 25 which is held by the clutch outer 23 and is magnetized in the axial direction; a non-magnetic frame 27 which is loosely fitted onto the clutch outer 23; It is a floating ring consisting of a ferrite permanent magnet 28 magnetized with opposite polarity, and a pair of engagement pins 2 on the circumferential side.
7a is provided protrudingly. Further, 29 has an intermediate portion supported by a pivot 29a on the holder 14, and
A shift lever 30 has a fork-shaped long hole 29b at one end that is engaged with the engaging pin 27a, and the other end is engaged with the plunger 13 in the same manner as described above, and 30 is a washer of the clutch outer 23. , 31 is a retaining ring thereof, and 32 is an oil seal that is attached to the cylindrical portion 3a of the front bracket 3 and is in sliding contact with the outer peripheral surface of a cover 33 that is caulked to the clutch outer 23 of the overrunning clutch 21 . However, in the case of this embodiment configuration, when the plunger 13 is attracted by energizing the electromagnetic switch 12, the shift lever 29 is rotated counterclockwise in the drawing, and the fork is engaged with the end thereof. The floating ring 26 is moved forward on the clutch outer 23. Since the permanent magnet 28 attached to the floating ring 26 and the permanent magnet 25 fixed to the clutch outer 23 have opposite polarities, the overrunning clutch 21 moves on the rotating shaft 5 due to the magnetic repulsion of both. This causes the pinion 8 to mesh with the ring gear 19 as shown in FIG. 3, and then cranking is performed in the same manner as above to start the internal combustion engine. , a permanent magnet body 22 fixed to an overrunning clutch 21 and a floating ring 2
6 means that the minute gap (△
t), and as a result, the overrunning clutch 21 is biased and held forward in a non-contact state, and there is no risk of mechanical friction or sliding contact between the two. be. In the above embodiments, ferrite is used as the permanent magnet, but other permanent magnets, such as annular rubber magnets, may also be used, and when this rubber magnet is used, the impact resistance (resistance to breakage) can be improved. . As detailed above, according to this invention, a permanent magnet is fixed to the overrunning clutch, and a permanent magnet with a polarity opposite to this permanent magnet is placed opposite to the overrunning clutch so that it can be operated by the shift lever. Since magnetic repulsion is used to apply transfer force to the overrunning clutch as the shift lever is operated, there is no risk of mechanical friction occurring between the two, and therefore the device rotational output is free of friction loss. In addition, if necessary, by making the pinion transfer mechanism part dust-proof with an oil seal, etc., iron particles worn in other parts will not enter and adhere to the inside of the device. This has various effects such as improving the reliability and durability of the device.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the configuration of a conventional pinion transfer device, Fig. 2a is a sectional view showing an embodiment of the pinion transfer device of this invention, and Fig. 2b is a partial cross section taken along line A-A of the same. FIG. 3C is an explanatory diagram showing a state in which both the permanent magnets are opposed to each other, and FIG. 3 is an explanatory diagram of the operation of FIG. 2. 2... DC motor, 3... Front bracket, 4 ... Armature, 5... Rotating shaft, 8... Pinion, 12 ... Electromagnetic switch, 13... Plunger, 19... Ring gear, 20 ... Starter, 2
DESCRIPTION OF SYMBOLS 1... Overrunning clutch, 22 ... Permanent magnet body, 23... Clutch outer, 25... Permanent magnet, 26 ... Floating ring, 28... Permanent magnet, 2
9...Shift lever, 32...Oil seal.

Claims (1)

[Claims for Utility Model Registration] (1) In a configuration comprising an overrunning clutch that is spline-engaged with the rotating shaft of the starter and has a pinion at its front end, and a shift lever that transfers the overrunning clutch, A permanent magnet with polarity in the axial direction is attached to the overrunning clutch side, and a permanent magnet with opposite polarity in the axial direction is attached to the shift lever side, and the magnetic repulsion of both permanent magnets causes
A starter pinion transfer device characterized in that an overrunning clutch can be transferred by a shift lever without contact. (2) a permanent magnet of an overrunning clutch;
2. A starter pinion transfer device according to claim 1, wherein the operating portion of the shift lever with the permanent magnet is protected by a dust-proof structure. (3) Claim 1 or 2 of the claim for utility model registration, characterized in that each permanent magnet is a rubber magnet.
The pinion transfer device for the starter described in 2.