JPS63129165A - Pinion shift mechanism of starter - Google Patents

Abstract

PURPOSE:To make the starter small-sized by freely inserting a shift plate into an outer peripheral groove which forms a part of a pinion sleeve and has a small width and allowing the shift plate to shift a pinion sleeve and pinion gear to the ring gear side of an engine by the pressing force in the rectilinear movement in a prescribed direction. CONSTITUTION:When a starter operates, a plunger 13 is attracted in the direction of the arrow A, and the branched part 10c of a shift lever 10 turns in the direction of the arrow B, and then a shift plate 9 performs a rectilinear movement in the direction of the arrow B through connecting members 9b and 11, interlocked with the above-described turn. A pinion sleeve 4 and a pinion gear 6 are shifted to the ring gear 7 side of an internal combustion engine by the pushing force of the rectilinear movement, and the pinion gear 6 is meshed with the ring gear 7. Therefore, the need of engaging the shift lever 10 directly with the outer peripheral groove of the sleeve as in the conventional is avoided, and since the dimension of the outer peripheral groove 8 is enough small for the shift plate 9 to be freely inserted, the whole length of the pinion sleeve, i.e., the shaft length of the starter can be shortened, and the whole starter can be made small-sized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter for an internal combustion engine, and more particularly to a pinion shift mechanism for shifting a starter pinion gear to a ring gear side of an internal combustion engine.

[Conventional technology]

The pinion shift mechanism for conventional embedded type starters is 1
For example, as disclosed in Japanese Utility Model Application Publication No. 59-167966, one end of a shift lever is engaged with the tip of a plunger operated by a magnetic switch or the like, and the other end of the shift lever is bifurcated. A structure was adopted in which the branch end was engaged with an engagement groove (sleeve outer circumferential groove) between an overrunning clutch and a flange provided on the pinion sleeve side.

With such a configuration, when the plunger operates, the shift lever shifts its fulcrum from the center on gear toward the ring gear of the internal combustion engine, and also engages the pinion gear with the ring gear.

[Problem that the invention seeks to solve]

By the way, this type of starter needs to be made smaller because the mounting space for the starter is becoming smaller due to the increase in the number of parts installed in the engine room of an automobile, but in the above-mentioned conventional technology.

For the following reasons, the starter could not be made sufficiently compact. That is, in the prior art described above, the branched end of the shift lever used in the pinion shift mechanism is directly engaged with the sleeve outer circumferential groove, but with this structure, the shift lever can be rotated. It is necessary to secure a sufficient space in the outer circumferential groove of the sleeve, which increases the overall length of the sleeve, the axial length of the motor rotating shaft, and the overall length of the starter, making it impossible to sufficiently downsize the starter. Also,
It has been desired that the contact area between the shift lever and the side surface of the clutch improves shift wear resistance.

The present invention has been made in view of the above points, and its purpose is to shorten the overall length of the pinion sleeve of the pinion shift mechanism to reduce the size of the starter, and to improve the wear resistance of the pinion shift mechanism. The purpose is to improve durability.

[Means for solving problems]

In order to achieve the above object, the present invention is configured as follows. In order to facilitate understanding of the content of the invention, the present invention will be described in detail with reference to the reference numerals of the embodiments shown in FIG.

That is, in the present invention, a pinion sleeve 4 having a pinion gear 6 is fitted onto a rotating shaft 2 of a motor via a spline 3, and a shift lever 10 is connected to one end 13a of a plunger 13 which is activated by a switch input from a starter. -10 in which the pinion sleeve 4 is slid in the axial direction to shift the pinion gear 6 to the ring gear 7 side of the internal combustion engine; A shift plate 9 formed of a plate material is loosely fitted into the outer circumferential groove 8 so that the shift plate 9 does not follow the rotation of the pinion sleeve 4 and can remain stationary. The shift lever 10 is bifurcated on the action point side, and each of the branched portions 10c is connected to the shift plate 9 by connecting means 9b.
, 10, and the connecting means 9b, 10b are constituted by connecting members that convert rotation of the shift lever 10 into linear motion and transmit it to the shift plate 9 side. With the pushing force of linear motion,
The pinion sleeve 4 and pinion gear 6 are set to be shifted to the ring gear 7 side of the internal combustion engine when the starter is input.

[Effect]

According to the present invention having such a configuration, when the plunger 13 is attracted in the direction of arrow A and the branch portion 10a of the shift lever 10 is rotated in the direction of arrow B, the shift plate 9 is rotated in conjunction with this. 7 linear movements are performed in the direction of arrow B via the connecting members 9b and 11, and the pushing force of this linear movement causes the pinion sleeve 4 and pinion gear 6 to
is shifted to the ring gear 7 side of the internal combustion engine, and the pinion gear 6 meshes with the ring gear 7.

Therefore, according to the present invention, the shift lever 1
There is no need to directly engage the outer peripheral groove of the sleeve with the outer peripheral groove of the sleeve, and there is no longer a need to secure the space required for rotation of the shift lever 10 in the outer peripheral groove of the sleeve 8 as in the past. As a result, the overall length of the binion sleeve and, in turn, the axial length of the starter can be shortened, making it possible to downsize the starter as a whole. Further, according to the present invention, since the contact area between the shift plate 9 and the side surface of the outer circumferential groove 8 can be increased, local concentrated frictional force is not applied to the contact surface, improving wear resistance and improving the durability of the pinion shift mechanism. can be improved.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 and 2.

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

In the figure, 1 is the armature of the starter DC motor.

2 is a rotating shaft that transmits the rotational force of the armature 1; 3 is a helical spline disposed on the rotating shaft 2; 4 is a binion sleeve; 5 is an overrunning clutch; and 6 is a pinion gear. The binion sleeve 4, the clutch 5, and the pinion gear 6 are integrally constructed, and the inner peripheral surface of the binion sleeve 4 engages with the helical spline 3 and is fitted onto the rotating shaft 2. In this way, the binion sleeve 4 ．． The clutch 5 and pinion gear 6 can slide in the axial direction, but in the rotational direction they are engaged with the rotating shaft 2 so that they can rotate integrally with the rotating shaft. 7 is a ring gear directly connected to the internal combustion engine.

Reference numeral 8 denotes a sleeve outer circumferential groove formed in the sleeve 4, and the sleeve outer circumferential groove 8 connects to the rear end side of the clutch 5 and a three-dimensional U-shaped groove 9.
A shift plate 9 having a diameter a is fitted into the sleeve outer circumferential groove 8 from above. The U-shaped groove 9a of this shift plate 9 is made somewhat wider than the sleeve diameter a at the position where the sleeve outer circumferential groove 8 is located, so that the shift plate 9 is loosely fitted into the sleeve outer circumferential groove 8, and the rotation shaft 2 and the sleeve 4 are in a loosely fitted state. Even if the sleeve rotates, it does not rotate and remains stationary, and the sleeve outer circumferential groove 8 is inserted only in the axial direction.
It is designed to allow you to move around inside. Furthermore, a pair of connecting pieces 9b are provided on both left and right sides of the shift plate 9 so as to extend to the vicinity of the center on both sides of the outer periphery of the clutch 5. The connecting piece 9b has a mechanical coupling relationship with the outer circumferential surface of the clutch 5, and thus remains stationary even when the clutch 5 is in a rotating state. Further, the connecting piece 9b is connected only to a branch end 10d of a shift lever 10, which will be described later, via a pin 11.

10 is a shift lever for pinion gear shift.

The shift lever 10 includes an engaging portion 10a that engages with one end 13a of a plunger 13 for driving the shift lever, and a fulcrum portion 1.
0b, and a branching part 10c that branches into two from the lower position of the fulcrum part 10b and straddles the outer peripheral surface of the clutch 5. Each end 10d of the first branching part 10c connects the shift plate 9 as described above. It is rotatably connected to the piece 9b via a pin 11. Therefore, in conjunction with the rotational movement of the shift lever 10, the shift plate 9 can linearly reciprocate in the axial direction via the connecting piece 9b.

12 is a magnetic switch disposed above the armature 1; 13 is a magnetic switch 12 turned on;
Plunger that reciprocates in off-action.

14 is a pinion pushing spring that presses the shift lever 10 toward the fulcrum 10b.

Next, the operation of this embodiment will be explained.

When the magnetic 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 point of action of the lever 1o, rotates in the direction of arrow B about the fulcrum 10b.
d, the shift plate 9 also moves in the direction of arrow B via the arm 9b, and as a result of this movement, the shift plate 9 pushes the side surface of the outer circumferential groove 8 on the rear side of the clutch 5, and the sleeve 4. At this time, the clutch 5 and pinion gear 6 are shifted in the direction of arrow B, and the pinion gear 6 thus meshes with the ring gear 7 of the internal combustion engine.

The DC motor is energized to rotate the armature 1 and rotating shaft 2, and the pinion sleeve 4 is rotated through the helical spline 3.
．． Clutch 5. The pinion gear 6 and hence the ring gear 7 rotate. In addition, pinion sleeve 4. When 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 circumferential groove 8 of the pinion sleeve 4. However, since the contact area between the two is large, there is a difference in local rotation. It is possible to prevent the occurrence of concentrated frictional force, thereby improving friction resistance and, ultimately, durability.

Further, when the magnetic is turned off, the meshing between the pinion gear 6 and the ring gear 7 is released by an operation opposite to the above-described operation.

As described above, unlike the conventional pinion shift mechanism, this embodiment does not engage the branched end 10d of the shift lever 1o in the sleeve outer circumferential groove 8, but instead fits a thin shift plate 9 therein. Therefore, the groove width of the outer circumferential groove 8 can be significantly narrowed.

[The shift lever 10 and the shift plate 9 are configured to wrap around the sleeve 4 and the clutch 5.] Therefore, the axial length of the sleeve 4 is significantly shortened, and the overall length of the starter is shortened, thereby making the entire starter more compact. can be achieved. Moreover, in this embodiment, since the shift plate 9 has a U-shaped groove shape, it is easy to attach and detach the shift plate 9 to and from the sleeve outer circumferential groove 8, thereby streamlining the assembly work. After that, the shift plate can be reliably attached.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to significantly shorten the overall length of the pinion sleeve at the end of the shift lever, thereby downsizing the entire sleeve, and to provide a pinion shift mechanism with excellent durability.

−Electric −

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing the arrangement of a pinion shift mechanism which is an embodiment of the present invention, and FIG.
It is a 1-line sectional view. 2...Motor rotating shaft, 3...Spline, 4...
Pinion sleeve, 5... Overrunning clutch, 6... Pinion gear, 7... Ring gear, 8...
・Peripheral groove. 9...Shift plate, 9a...U-shaped groove, 9b, 1
DESCRIPTION OF SYMBOLS 1... Connection means (connection piece, pin), 10... Shift lever-510c... Lever branch part, 13... Plunger. 13a...One end of the plunger.

Claims (1)

[Scope of Claims] 1. A pinion sleeve having a pinion gear is fitted onto the rotating shaft of the motor via a spline, and a shift lever is connected to one end of a plunger that is activated by switch input from a starter, and the shift lever is used to control the pinion. In a device that shifts a pinion gear to the ring gear side of an internal combustion engine by sliding a sleeve in the axial direction, a small outer circumferential groove into which a plate material can be inserted is formed in a part of the pinion sleeve; , a shift plate formed of a plate material is fitted loosely so that even when the pinion sleeve rotates, it does not follow it and remains stationary; on the other hand, the shift lever is bifurcated on the action point side, and this bifurcation each of the parts is connected to the shift plate via a connecting means, and the connecting means is constituted by a connecting member that converts rotation of the shift lever into a linear motion and transmits the linear movement to the shift plate, A pinion shift mechanism for a starter, characterized in that the pinion sleeve and pinion gear are set to shift toward a ring gear side of an internal combustion engine when a starter is input by a pushing force generated by linear movement of the shift plate in a predetermined direction. 2. The starter pinion shift mechanism according to claim 1, wherein the fitting groove of the shift plate for loosely fitting into the outer peripheral groove of the pinion sleeve is a U-shaped groove. 3. In claim 1 or 2, the pinion sleeve has a lining clutch, and the shift plate and the branch part of the shift lever are connected through a connecting member near the outer periphery of the lining clutch. The starter pinion shift mechanism is operated by