JPS59122778A - Pinion transfer device of engine starter - Google Patents

Abstract

PURPOSE:To smoothly transfer a pinion in an engine starter, by sliding an overrunning clutch and the pinion in the axial direction along an armature shaft in order to engage the pinion with the ring gear of an engine when it is started. CONSTITUTION:An upper end part 10a' of a plate lever 10a is engaged to a hole in an engagement part 9a protrusively provided in the end part of a plunger 9 in a magnetic switch 8, while a bottom end part 10a'' is engaged to a stopper part 6a' formed in the peripheral surface of an outer 6a of an overrunning clutch 6. A lever holder 12a of almost triangular shape is turnably mounted to a pin constituting a supporting point 11a, and a position of the supporting point 11a is set so that the plate lever 10a is protruded in an arc shape in the opposite side to the supporting point 11a by adapting the supporting point 11a to the plate lever 10a. When the plunger 9 is attracted in the rightward direction, the overrunning clutch 6 and a pinion 5 are engaged with an engine ring gear 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine starter, and more particularly, to an engine starter that slides an overrunning clutch and a binion in the axial direction along an armature shaft in order to engage the binion with a ring gear of an engine when starting the engine. This relates to a binion transfer device for

FIG. 1 shows an engine starter equipped with a conventional Binion device. 1 is an armature having a shaft 2 supported by a housing 3. On the shaft 2 is an armature that can be engaged with a ring gear 4 of the engine. A binion 5 is attached so as to be slidable and rotatable in the axial direction. An overrunning clutch 6 for transmitting the rotation of the armature 1 to the pinion 5 is also mounted on the shafts 1 and 2 so as to be slidable in the axial direction together with the pinion 5. A magnetic switch 8 fixed to the housing 3 has a plunger 9 which is electromagnetically attracted to the right in Fig. 1 when the starter switch is turned on.
A plate lever 10 for shifting the pinion 5 and overrunning clutch 6 toward the ring gear 4 engages the overrunning clutch 6 at one end and engages the plunger 9 at the other end. When the plunger 9 is attracted to the right in the figure, it rotates around the fulcrum 11 and transmits the motion of the plunger V to the Δ-bar running clutch 6 and the pinion 5. The fulcrum 11 is formed by the inner surface of a vertical through hole formed in a fulcrum member 12 fixed to a stationary part provided in the housing 3. In other words, the plate lever 10 simply passes through this through hole. The engagement relationship between the plate lever 10 and the plunger 9 is such that the upper end of the plate lever 10 is simply inserted into the hole of the engagement member protruding from the end face of the plunger 9. The plate lever 10 is supported in the vertical direction on the overrunning clutch 6 side, and has a complicated structure.

Also, when the plunger 9 is attracted to the right, the plate lever 10
The plate lever 10 elastically pushes the overrunning clutch 6 and the binion 5 to the left while bending in an arc shape to engage the binion with the ring gear 4. In order to stably perform this engagement in each starter, the plate lever 10 '\'s required load becomes higher. To explain this point with reference to Fig. 5, this figure is a graph showing the plate lever load characteristics, and the straight line indicated by a dashed line (A> indicates the characteristics of the conventional plate lever support structure shown in Fig. 1). The stroke of the plunger 9 required to move the binion 5 to the left in FIG. If the variation in g) (variation due to manufacturing error) causes variation in the range from S+ to S2 in FIG. 5, then the variation in the load generated by the plate lever due to the variation in plunger stroke extends over a wide range from L+ to L2. Therefore, the leaf spring 10 is the longest stroke S of the plunger 9.
The maximum load corresponding to 2 [η has a high deflection constant that can withstand 2
It is necessary to use a leaf spring to make the plunger, which increases the variation in load with respect to the plunger stroke, making it impossible to obtain stable meshing performance and plunger operating voltage.

The present invention aims to solve this problem, and its gist is that when the plunger of the magnetic switch moves in the axial direction, it rotates around a fulcrum and transfers the movement of the plunge V to the overrunning clutch and pinion. A provisional lever with elasticity for transmitting the transmission and a lever holder rotatable about the fulcrum are provided, and the lever holder is provided with two lever abutting portions spaced apart from each other in the longitudinal direction of the lever. These abutting portions are brought into contact with one side of the temporary lever, and the fulcrum is brought into contact with the other side of the temporary lever, and the plate lever is moved slightly toward the fulcrum (in a tilted state) between the fulcrum and the lever holder. It is located at the point sandwiched between the two.

The invention will be explained in detail below with reference to FIGS. 2 and 3. In these figures, parts not shown in FIG. 1 but similar to those in the conventional example are designated by the same reference numerals (t) as in FIG. 1 to avoid duplication of explanation.

The upper end 108' of the plate lever 10a engages with the hole of the engaging part 9a protruding from the end of plunge I'7 of the magnetic switch 8, and the lower end 108'' engages with the hole of the engaging part 9a of the outer 6a of the overrunning clutch 6. Locking portion 6a formed on the outer peripheral surface
' is engaged with. The fulcrum 11a is formed by a bottle that is directly or indirectly attached to the inner surface of the housing 3, and is in contact with one side (the right side in the figure) of the plate lever 10a.The position of this fulcrum 11a is is set so that when the fulcrum 11a comes into contact with the plate lever 10a, the plate lever 108 protrudes in an arc shape on the side opposite to the fulcrum 11a.

A triangular lever holder 12a is rotatably attached to the bottle forming the fulcrum 11a. As clearly shown in FIG. 3, the lever holder 128 is attached to the plate lever 10a.
two lever contact portions 12a' separated from each other in the longitudinal direction;
12a'', and these lever contact portions 12a', 12
a'' is in contact with the other side of the plate lever (the left side as seen in the figure) in a state where the plate bar 10a is pressed toward the fulcrum 11a.

In addition, 6b is the outer 6 of the overrunning clutch 6.
This is an inner that is combined with a in a hugging state via a roller 6C, and is formed integrally with the binion 5.

In the above configuration, when the starter switch is turned on, the plunger 9 is electromagnetically attracted to the right as seen in the figure, and pulls the upper end 10a' of the plate lever 10a to the right. This causes the plate lever 10a to rotate clockwise around the fulcrum 11a, moving the overrunning clutch 6 and the pinion 5 toward the ring gear 4. In this case, if the pinion 5 does not mesh well with the ring gear 4, the plate lever 10a with the live springs 1 to 1 bends in an arc until the pinion 5 and the ring gear 4 mesh together.
Since the plate lever 10a is held at three points by the temporary lever 10a or the fulcrum 11a and the two lever contact parts 12a' and 12a'' of the lever bolter 12a, the plate lever 10a is held at the lever contact part 12a' of the lever holder 12a. l 2a
The spring constant will be different before and after leaving the rr. That is, at the initial +11J stage of rightward movement of the plunger 9, the end 1 of the plate lever 10a is lower than the point of contact with the lever contact portions 12a', 128''.
Since the 0a', 108'' odd part is mainly bent, the spring constant is higher than the spring constant when the entire plate lever 10a is bent, and a slight rightward movement of the plunger 179 causes a considerably high load value (β1 ) (see solid line B in Fig. 5).Next, the plunger 9 further moves to the right, and the plate lever 10a further bends in an arc shape and separates from the lever abutting portion 12a'12a'' of the lever halter 12a. Thereafter, the plate lever 10a is bent by the spring constant of the entire plate lever 10a, so the spring constant becomes smaller, and the increase in the plate lever load with respect to the increase in the amount of movement of the plunger 9 becomes smaller. Therefore, due to the variation in the dimension ((j) between the pinion 5 and the ring gear 4, the stroke of the plunge A7 required to mesh the pinion 9 with the ring gear 4 will increase from S + force \ to S2 as shown in Fig. 5. Even if it varies within the range, the variation in the plate reno \-108 Kosei load due to the variation in the 74 lancier stroke is within a narrow range of (2 to (3)), and is stable against the variation in the movement m of the plunger 9. The temporary lever generated load force is 1q, and therefore, when the pinion 5 is engaged with the ring gear 4, stable meshing ability and stable plunger operating voltage can be reduced by 1q. U'21J will be fruitful.

FIG. 4 shows a modified example 12b y, 2 of the small lever holter, and this modified holter has a pin 1 constituting the fulcrum.
Rotatably throw it into 1a and move it to d3 and put it into the board - 10a
The boss uii 11 a' comes into contact with one side of the temporary lever 108, and the other side of the temporary lever 108 comes into contact with /<-1 second 851
2b', 1211''.This variation Iβ(sill(
In this case, the bottle lla or board reno \-10 that constitutes the fulcrum
The lever halter 12b0')/1 boss part 11a' does not come into direct contact with the temporary lever (12b0') or the temporary lever (17X). It should be interpreted as a thing.

[Brief explanation of drawings]

FIG. 1 is a partial side view and a partial top view showing the main parts of an engine starter equipped with a conventional engine transfer device. FIG. 2 is a diagram similar to FIG. 1, or is a diagram showing the main parts of an engine starter embodying the present invention. 3 is an enlarged sectional view of the binion transfer device of FIG. 2; FIG. FIG. 4 is a diagram showing a modification of the lever halter shown in FIG. 3. FIG. 5 is a graph showing a comparison of the plate lever generation characteristics of the conventional pinion transfer device and the pinion transfer device of the present invention with respect to the Branjas 1-roller. 1... Armature 2... Shaft 4... Ring gear 5... Binion 6... Overrunning clutch 8... Magnet switch 9... Plunger 10... Plate lever 11a...・Fully point (pin) 12a...Lever halter 12a', 128''...Lever contact part agent Shallow
118 Other 4 people 2nd Inga 5 figure F'U> Shikinuto o-7

Claims (1)

[Claims] A binion rotatably and axially slidably disposed on the armature A7 shaft and capable of meshing with the ring gear of the engine; 1. A pinion transfer device for an engine starter, comprising: an overrunning clutch for transmitting rotation of an armature to the pinion; and a magnet switch having a plunger; a resilient plate lever which engages the plunger and rotates about a fulcrum when the plunger moves in the axial direction to transmit the movement of the plunger to the overrunning clutch and the pinion; The lever holder has two lever abutting portions spaced apart from each other in the longitudinal direction of the lever, and the plate lever is attached to one side of the lever or to the fulcrum. The engine is supported by the lever holder and is held between the fulcrum and the lever halter in a state where the extending side is in contact with the two contact portions of the lever holder and is slightly bent toward the fulcrum. Starter binion transfer device.