JP2507365B2 - Starter pinion shift mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter for an internal combustion engine, and more particularly to a pinion shift mechanism for shifting a pinion gear for a starter to a ring gear side of the internal combustion engine.

[Conventional technology]

A conventional pinion shift mechanism for an embedded starter is constructed by engaging one end of a shift lever with the tip of a plunger operated by a magnetic switch as disclosed in, for example, Japanese Utility Model Publication No. 59-167966. The other end side is bifurcated, and the branched end portion is engaged with an engaging groove (sleeve outer peripheral groove) between the overrunning clutch provided on the pinion sleeve side and the flange portion. With such a structure, when the plunger is operated, the shift lever rotates about the fulcrum, and the branch end of the shift lever pushes one end of the overrunning clutch to move the pinion gear to the internal combustion engine. The gear was shifted to the ring gear side and the pinion gear was meshed with the ring gear.

[Problems to be solved by the invention]

By the way, in this type of starter, since the mounting space of the starter is being reduced along with the increase in the number of mounting parts in the automobile engine room, it is necessary to reduce the size of the starter. For the reason, we were able to make the starter compact enough. That is, in the above-mentioned conventional technique, the branched end portion of the shift lever used in the pinion shift mechanism is directly engaged with the sleeve outer peripheral groove.
With such a structure, it is necessary to secure a sufficient space for the sleeve outer peripheral groove to perform the pivotal movement of the shift lever, which increases the overall sleeve length, the motor rotation shaft length, and the starter overall length. , The starter was downsized sufficiently. Further, since the contact area between the shift lever and the side surface of the clutch is in a state close to the line contact of the shift lever thickness, concentrated frictional force is applied to the contact portion to easily wear it, and the wear resistance can be improved. Was wanted.

The present invention has been made in view of the above points, and an object thereof is to shorten the entire length of the pinion sleeve of the pinion shift mechanism to reduce the size of the starter, and further to improve the wear resistance of the pinion shift mechanism. It is to improve the durability.

[Means for solving problems]

The present invention is configured as follows to achieve the above object. In order to facilitate understanding of the contents of the invention, the first
The configuration of the present invention will be described with reference to the reference numerals of the embodiments in the drawings.

That is, according to the present invention, the pinion sleeve 4 having the pinion gear 6 is fitted to the rotary shaft 2 of the motor via the spline 3, and the shift lever 10 is connected to the one end 13a of the plunger 13 operated by the switch input of the starter to shift the gear. In the case where the pinion sleeve 4 is slid in the axial direction by the lever 10 to shift the pinion gear 6 to the ring gear 7 side of the internal combustion engine, the outer peripheral groove 8 is small enough to allow the plate material to be inserted into a part of the pinion sleeve 4. The shift plate 9 formed of a plate material is loosely fitted in the outer peripheral groove 8 so that the pinion sleeve 4 does not follow the rotation of the pinion sleeve 4 even if the pinion sleeve 4 rotates and the stationary state is maintained. 10 has a bifurcated side of the point of action,
Each of c is connected to the shift plate 9 via connecting means 9b and 11, and the connecting means 9b and 11 convert the rotation of the shift lever 10 to the shift plate 9 side and transmit the linear movement. In addition, the shift plate 9 is set so as to shift the pinion sleeve 4 and the pinion gear 6 to the ring gear 7 side of the internal combustion engine when the starter is input by the pushing force by the linear movement in the predetermined direction.

[Action]

According to the present invention having such a configuration, when the plunger 13 is attracted in the direction of arrow A when the starter is input and the branch portion 10c of the shift lever 10 rotates in the direction of arrow B, the shift plate 9 is interlocked with this. The pinion sleeve 4 and the pinion gear 6 are shifted to the ring gear 7 side of the internal combustion engine by the pushing force of this linear movement through the connecting members 9b and 11, and the pinion gear 6 meshes with the ring gear 7. become.

Therefore, according to the present invention, the shift lever as in the conventional case is used.
There is no need to directly engage the sleeve outer peripheral groove with the sleeve outer peripheral groove, and it is no longer necessary to secure the space required for the rotation of the shift lever 10 in the sleeve outer peripheral groove 8 as in the past. The width of the pinion sleeve may be small enough to allow the insertion of the pinion sleeve. As a result, the overall length of the pinion sleeve and thus the axial length of the starter can be shortened, and the size of the entire starter can be reduced. Further, according to the present invention, since the contact area between the shift plate 9 and the side surface of the outer peripheral groove 8 can be increased, local contact frictional force is not applied to the contact surface to improve wear resistance and durability of the pinion shift mechanism. It is possible to improve the sex.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a side view showing an arrangement state of starter components which is an embodiment of the present invention, and FIG. 2 is a sectional view taken along line I-I of FIG.

In the figure, 1 is an armature of a DC motor for starter, 2 is a rotary shaft for transmitting the rotational force of the armature 1, 3 is a rotary shaft 2
The helical spline, 4 is a pinion sleeve, 5 is an overrunning clutch, and 6 is a pinion gear. The pinion sleeve 4, the clutch 5 and the pinion gear 6 are integrally formed, and the inner peripheral surface of the pinion sleeve 4 engages with the helical spline 3 and is fitted onto the rotary shaft 2. In this way, the pinion sleeve 4, clutch 5 The pinion gear 6 can slide in the axial direction, but engages with the rotary shaft 2 in the rotational direction so that the pinion gear 6 can rotate integrally with the rotary shaft 2. Reference numeral 7 is a ring gear directly connected to the internal combustion engine.

Reference numeral 8 denotes a sleeve outer peripheral groove formed in the sleeve 4, and the sleeve outer peripheral groove 8 is provided between the rear end side of the clutch 5 and the flange portion 4a provided at one end of the sleeve 4, and the sleeve outer peripheral groove 8 is formed in the sleeve 2 shown in FIG. A shift plate 9 having a U-shaped groove 9a as shown in (1) is fitted from above the sleeve outer peripheral groove 8. The U-shaped groove 9a of the shift plate 9 is made slightly wider than the sleeve diameter 1 at the position where the sleeve outer peripheral groove 8 is present, so that the shift plate 9 is loosely fitted in the sleeve outer peripheral groove 8.
Even if the rotating shaft 2 and the sleeve 4 rotate, they are fitted and inserted so that they do not rotate and accordingly remain stationary, and they can move in the sleeve outer peripheral groove 8 only in the axial direction. Further, a pair of connecting pieces 9b is provided on both left and right sides of the shift plate 9 so as to extend to the vicinity of the center of both sides of the outer periphery of the clutch 5. This connecting piece 9b does not have a mechanical coupling relationship with the outer peripheral surface of the clutch 5, and accordingly maintains the stationary state even when the clutch 5 is rotated. The connecting piece 9b is a branch end portion 10d of the shift lever 10 described later.
And is only connected via pin 11.

10 is a shift lever for shifting the pinion gear, and the shift lever 10 is one end of the plunger 13 for driving the shift lever.
Each of the ends of the branch portion 10c includes an engagement portion 10a that engages with the support portion 13a, a fulcrum portion 10b, and a branch portion 10c that bifurcates from a position below the fulcrum portion 10b and extends over the outer peripheral surface of the clutch 5. As described above, the portion 10d is rotatably connected to the connecting piece 9b of the shift plate 9 through the pin 11. Therefore, the shift plate 9 can reciprocate linearly in the axial direction through the connecting piece 9b in conjunction with the rotational movement of the shift lever 10.

Reference numeral 12 is a magnetic switch arranged above the armature 1, 13 is a plunger that reciprocates by turning the magnetic switch 12 on and off, and 14 is a pinion for pushing the shift lever 10 to the fulcrum 10b side. It is a spring.

 Next, the operation of this embodiment will be described.

When the magnetizing switch 12 is energized by the input of the starting switch, the plunger 13 is attracted in the direction of arrow A, and the branch end 10d, which is the action point of the lever 10, is the fulcrum 10b.
Rotate in the direction of arrow B around. Following the movement of the branch end 10d, the shift plate 9 also moves in the direction of arrow B via the arm 9b, and this movement causes the shift plate 9 to push the side surface of the outer peripheral groove 8 on the rear side of the clutch 5 and the sleeve 4, clutch 5 and The pinion gear 6 is shifted in the direction of arrow B, and thus the pinion gear 6 meshes with the ring gear 7 of the internal combustion engine. At this time, the DC motor is energized to rotate the armature 1 and the rotating shaft 2, and the pinion sleeve 4, the clutch 5, the pinion gear 6, and thus the ring gear 7 rotate via the helical spline 3. When the pinion sleeve 4, the clutch 5, etc. rotate, the shift plate 9 remains stationary, so a relative rotation difference occurs between the shift plate 9 and the side surface of the outer peripheral groove 8 of the pinion sleeve 4. Since the contact area is large, it is possible to prevent the localized concentrated frictional force from being generated, and to improve the friction resistance and thus the durability.

Further, when the magnetism is turned off, the engagement between the pinion gear 6 and the ring gear 7 is released by a reverse operation to the above operation.

As described above, unlike the conventional pinion shift mechanism, the present embodiment does not engage the branched end 10d of the shift lever 10 in the sleeve outer peripheral groove 8 and instead mounts the thin shift plate 9 therein. As a result, the groove width of the outer peripheral groove 8 can be significantly narrowed, and moreover, the shift lever 10 and the shift plate 9
Since it is constructed by lapping the sleeve 4 and the clutch 5, the axial length of the sleeve 4 can be greatly shortened, and the total length of the starter can be shortened, and the size of the entire starter can be reduced. Moreover, in this embodiment, the shift plate 9 can be easily attached to and detached from the sleeve outer peripheral groove 8 because the shift plate 9 has a U-shaped groove shape, so that the assembling work is rationalized. Furthermore, the effect that the shift plate can be securely attached once assembled is exhibited.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a pinion shift mechanism which has a significantly shortened overall length of the pinion sleeve of the shift lever mechanism to reduce the size of the entire sleeve and which is excellent in durability. Further, since the shift plate and the pinion sleeve are brought into surface contact with each other, a large contact area can be secured, so that wear resistance is improved. Further, since the shift plate is U-shaped, it can be easily attached to and detached from the sleeve outer peripheral groove, and the assemblability is good and the disassembly is easy.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an arrangement state of a pinion shift mechanism which is an embodiment of the present invention, and FIG. 2 is an I-I of FIG.
It is a line sectional view. 2 ... Motor rotating shaft, 3 ... Spline, 4 ... Pinion sleeve, 5 ... Overrunning clutch, 6 ...
Pinion gear, 7 ... Ring gear, 8 ... Outer peripheral groove, 9 ...
… Shift plate, 9a …… U-shaped groove, 9b, 11 …… Connecting means (connecting piece, pin), 10 …… Shift lever, 10c …… Lever branching part, 13 …… Plunger, 13a …… Plunger end.

Claims (1)

(57) [Claims] 1. A pinion sleeve fitted to a rotary shaft of a motor via a spline and having a pinion gear, a bifurcated shift lever connected to one end of a plunger of a magnetic switch operated by a switch input of a starter, and the shift. In a pinion shift mechanism of a starter for sliding the pinion sleeve in the axial direction by a lever to shift a pinion gear to a ring gear side of an internal combustion engine, a small outer peripheral groove is formed on a part of an outer surface of the pinion sleeve, and A shift plate formed of a plate material is loosely fitted in the outer peripheral groove, and each of the branch tip end portions of the shift lever is connected to the shift plate via a connecting means.
A pinion shift mechanism for a starter characterized in that an outer peripheral portion of an overrunning clutch is connected, and a shift lever and one end of a connecting means are rotatably connected at the outer peripheral portion of the overrunning clutch.