JPS5918263A - Inertia sliding type starter - Google Patents

Abstract

PURPOSE:To smooth the meshing of a pinion with a ring gear by a method wherein a braking mechanism, stopping temporarily the rotation of the pinion upon starting cranking, is provided to advance the pinion surely by the mechanism. CONSTITUTION:When a starting switch is put ON upon starting an engine, a starting motor 1 is driven and a driving shaft 13 is rotated through the pinion 8 and an internal gear 9. At the same time, an electromagnetic operating mechanism 28 is operated, a swing arm 27 is swung by the right movement of a plunger 32, engaging pawl 25 engages with the engaging groove 24 of a sliding cylinder 17 and the sliding cylinder 17 is provided with a braking torque in the rotating direction only. Then, the sliding cylinder 17 is moved to the right by the successive rotation of the driving shaft 13 while compressing a return spring 47 by an inertia caused by the braking mechanism 23. When the teeth of the pinion 22 is abutted against the same of a ring gear 21, the advance of the sliding cylinder 17 is precluded and the pinion 22 meshes with the ring gear 21 by the rotation of the sliding cylinder 17 which is effected against the braking torque.

Description

[Detailed description of the invention] The present invention relates to an inertial sliding starting device.

In this type of device, when the engine is started, the starter motor is driven to ensure that the pinion moves forward by inertia and meshes with the engine's ring gear, and if the engine's rotation fluctuates rapidly due to irregular ignition during startup, the pinion moves forward into the ring gear. It is necessary to prevent the engine from disengaging further and to continue cranking the engine without interruption.

In view of the above, the present invention prevents the rotation of the pinion by operating a brake mechanism at the time of starting the engine to ensure its forward movement, and prevents the pinion from detaching from the ring gear by operating the early detachment prevention mechanism during engine startup. Furthermore, it is an object of the present invention to provide a compact starting device in which the brake mechanism and the early release prevention mechanism are operated and released by a common electromagnetic actuation mechanism.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.H is a housing that accommodates various mechanical parts;
It consists of a motor accommodating part 2 located on the left side in the figure, a reducer accommodating part 3 located in the middle, and an early release prevention mechanism accommodating part 4 located on the right side. A rotary shaft 6 of the starting motor 1 housed in the motor housing 2 is rotatably supported on the partition wall 5 between the motor housing 2 and the reducer housing 3 via a bearing 7. The pinion 8 meshes with an internal gear 9 housed in the reducer housing 3. A drive shaft 13 consisting of a large diameter portion 10, a medium diameter portion 11, and a small diameter portion 12 is integrally protruded from the end wall of the internal gear 9.
passes through the early detachment prevention mechanism housing portion 4. Drive shaft 130
The large diameter portion 10 is rotatably supported via a bearing 15 on the partition wall 14 between the reducer housing portion 3 and the early release prevention mechanism housing portion 4, and the tip of the small diameter portion 12 of the blade moving shaft 13 is connected to the partition wall 14 between the reducer housing portion 3 and the early release prevention mechanism housing portion 4. It protrudes to the outside from the outer wall 16 of the prevention mechanism accommodating portion 4 .

Inside the drive shaft 13, a sliding tube 17 is placed over the small diameter portions 11 and 12, and the base end side of the sliding tube 17 is screwed to the medium diameter portion 11 via a helical spline #I+'2. ,
Further, a bearing portion 18 protruding from the inner circumferential surface of the intermediate portion is slidably supported by the small diameter portion 12 via a bearing 19. Further, the sliding tube 17 is rotatably and slidably supported by the outer wall 16 of the early detachment prevention mechanism accommodating portion 4 via a bearing 20. Sliding tube 1
A pinion 22 that can mesh with a ring gear 21 of the engine is formed integrally with the outer circumferential surface of the tip of the engine 7.

A brake mechanism 23 is provided on the base end side of the sliding tube 17 to apply a constant braking torque only in the rotational direction so as to advance the sliding tube 17 rightward in FIG. 1 after the drive shaft 130 starts rotating. The brake mechanism 23 has a plurality of engagement grooves 24 formed at equal intervals on the circumference on the base end surface of the sliding tube 17, and a plurality of engagement grooves 24 that can be engaged with any one of the engagement grooves 24. Matching claw 25
and a swinging arm 27 whose one end is swingably supported on the bulkhead 14 by a pin 26, the swinging arm 27
is swung by an electromagnetic actuating mechanism 2, so that the engaging pawl 25 can be engaged with and disengaged from the engaging groove 24.

As clearly shown in FIG. 2, the electromagnetic actuation mechanism 2 consists of a casing 29 attached to the early detachment prevention mechanism accommodating portion 4, a coil 30 fixed inside the casing 29, and a coil 30 fitted into one end of the center hole of the coil 30. It is composed of an iron core 31 attached thereto, a plunger 32 slidably fitted into the other end of the center hole, and a return spring 33 for the plunger 32.

Two flanges 34.3 are provided at the tip of the plunger 32.
5 is provided, and a return spring 33 is compressed between the flange portion 35 located inside the flange portion 35 and the coil cover 36. When the coil 30 is not energized, the tip of the plunger 32 abuts against the inner surface of the end wall of the casing 29 due to the elastic force of the return spring 33, so that the coil 30 of the plunger 32
It is prevented from coming out from the center hole.

An engagement pin 37 bent into a hook shape is protruded from the free end side of the swing arm 27, and the engagement pin 37 is inserted between the flange portions 34 and 35 of the two plunger 320s. . As a result, when the coil 30 is energized, the iron core 31 is magnetized and the plunger 32 is attracted to the right in FIG. 2, so the swinging art 27 swings clockwise in FIG. It engages with any one of the 17 engagement grooves 24.

On the other hand, when the current to the coil 30 is cut off, the plunger 32 slides to the left in FIG.

The braking torque generated by the electromagnetic actuating mechanism 28 is such that when the sliding tube 17 collides with the ring gear 21 and is prevented from moving forward, the engaging groove 24 disengages from the engaging pawl 25 and the sliding tube 17 rotates. set to get. In addition, the length of the engaging claw 25 is such that the engaging claw 25 has a length until the engagement between the pinion 22 and the ring gear 21 is substantially completed.
5 and the engagement groove 24 can continue to be engaged with each other.

An early detachment prevention mechanism 38 as described below is provided between the sliding tube 17 and the outer wall 16.

That is, a cylindrical portion 39 into which the sliding tube 17 is loosely inserted is protruded from the inner surface of the outer wall 16, and a pair of ball insertion holes 4° are formed in the peripheral wall of the cylindrical portion 39 with a phase difference of 180 degrees. . A lock ball 41 having a diameter larger than the thickness of the peripheral wall of the cylindrical portion 39 is loosely fitted into each ball insertion hole 40 . A lock groove 42 is formed on the outer circumferential surface of the base end of the sliding tube 17 adjacent to the engagement groove 24, and a portion of each lock ball 41 is in contact with the outer circumferential surface of the sliding tube 17. Between is Tsutsube 39 Yu ■
Each lock ball 41 is exposed on the circumferential surface, while each lock ball 41 is in a lock groove 42.
When it falls into the cylindrical portion 39, a portion of the cylindrical portion 39 is submerged from the circumferential surface. A lock ring 43 is rotatably disposed on the outer periphery of the cylindrical portion 39, and when a portion of each lock ball 41 is exposed from the outer periphery of the cylindrical portion 39, a portion of each lock ball 41 is attached to the inner periphery of the lock ring 43. A pair of relief grooves 44 that engage with each other are formed. An engagement pin 45 bent into a hook shape is protruded from the outer peripheral surface of the lock ring 43, and the engagement pin 45 is inserted between the two flanges 34 and 35 of the plunger 32. As a result, when the electromagnetic actuating mechanism 28 is activated, as the sliding cylinder 17 moves forward, the braking of the brake mechanism 23 is released, that is, the engaging claw 25 of the swinging arm 27
After the engagement groove 24 of the sliding tube 17 is disengaged from the lock ring 43, when each lock ball 41 falls into the lock groove 42, the lock ring 43
It rotates clockwise in the figure to close the opening of the ball insertion hole 40 and prevent the lock groove 42 of each lock ball 41 from coming off. 48 is a retaining ring for the lock ring 43.

The sliding tube 17 is disposed between the bearing portion 18 of the sliding tube 17 and the retainer 46 which is held at the tip of the small diameter portion 12 of the drive shaft 13 to prevent it from coming off.
A return spring 47 is compressed.

Next, the operation of this embodiment will be explained.

1st. Figure 2 shows the state before starting the engine, and shows the sliding tube 1.
7 receives the extension force of the return spring 47 and moves the proximal end surface to the drive shaft 1.
30 is held in a retracted position where it abuts against the stepped portion between the large diameter portion 10 and the medium diameter portion 11. Further, since the electromagnetic actuation mechanism 28 is not activated, the plunger 32 collides with the inner surface of the end wall of the casing 29 due to the expansion force of the return spring 33, and as a result, the swing arm 2
7 swings in the counterclockwise direction in FIG. , a portion of each lock ball 41 exposed from the outer circumferential surface of the cylindrical portion 39 is
3 are engaged with the grooves 44.

When starting the engine, turn on the start switch and start motor 1.
is driven to rotate the drive shaft 13 via the pinion 8 of the rotating shaft 6 and the internal gear 9. At the same time, the electromagnetic actuating mechanism 28 is activated to attract the plunger 32 to the right in FIG. 2, and the swinging arm 27 is swung clockwise in FIG.
is engaged with any one of the engagement grooves 24 of the sliding tube 17 to apply braking torque to the sliding tube 17 only in the rotational direction.

As the drive shaft 130 continues to rotate, the sliding tube 17 starts to move forward in the right direction in FIG. 1 while compressing the return spring 47 due to inertia caused by the brake mechanism 23. and Binion 2
When the teeth of the ring gear 21 collide with the teeth of the ring gear 21, the sliding cylinder 17 is prevented from moving forward, so the sliding cylinder 17 overcomes the braking torque, that is, the engagement force of the engaging pawl 25, and rotates, which causes the pinion to rotate. 22, the ring gear 21 starts to mesh. After this engagement starts, the sliding cylinder 17 moves forward again, and the swinging arm 27
After the engagement groove 24 of the sliding tube 17 is disengaged from the engagement claw 25 of the sliding tube 17, the sliding tube 17 continues to move forward due to the inertia of the ring gear 21 until the engagement between the binion 22 and the ring gear 21 is completed.

When the binion 22 and the ring gear 21 complete meshing, the third. As shown in FIG. 4, the lock groove 4 of the sliding tube 17
2, each lock ball 41 falls, and a portion of each lock ball 41 sinks from the outer circumferential surface of the cylindrical portion 39. At this point, the sliding tube 17 has come off the swing arm 27, so the plunger 32 of the electromagnetic actuating mechanism 2B is further attracted to the right in FIG. 2 and collides with the iron core 31 as shown in FIG. As a result, the lock ring 43 rotates clockwise in FIG. 2, and the opening of each ball insertion hole 40 is closed by the lock ring 43, as shown in FIG.

As a result, the forward and backward movement of the sliding tube 1T is delayed by the operation of the early detachment prevention mechanism 38, so that the drive shaft 130
The rotational force is transmitted to the sliding tube 1γ, rotates the ring gear 21 via the pinion 22, and ranks the engine.

In this case, even if the engine undergoes violent rotational fluctuations due to irregular ignition and instantaneous retraction force acts on the pinion 22 from the ring gear 21, the sliding tube 17 will not be retracted by the early disengagement prevention mechanism 3.
8 prevents the binion 22 from disengaging from the ring gear 21, so that cranking of the engine can be continued and the engine can be reliably started.

After the engine starts, the sliding tube 17 is rotated at high speed by the ring gear 21 and is also receiving the elastic force of the return spring 47, so that the sliding tube 17 receives a thrust in the direction of retreating to the left in FIG. work. Then, when the start switch is turned off, the power to the start motor 1 is cut off, and the driving of the drive shaft 13 is stopped. At the same time, the power to the electromagnetic actuating mechanism 28 is cut off.
The plunger 32 slides to the left in FIG.
is swung counterclockwise to a position where it does not engage with the engagement groove 24 of the sliding tube 17, and the lock ring 43 is similarly rotated counterclockwise so that its six relief grooves 44 and each lock ball 41 are rotated counterclockwise. They match, and each lock ball 41 also comes out of the lock groove 42.

That is, since the early detachment prevention mechanism 38 is released, the proximal end surface of the sliding tube 1T abuts against the stepped portion between the large diameter portion 10 and the medium diameter portion 11 via the helical spline, rll, and T2. During this time, the pinion 22 is detached from the ring gear 21.

As described above, according to the present invention, the drive shaft rotatably supported by the starter motor is rotatably supported in the housing, and the sliding joint that is screwed onto the drive shaft via the helical plane is rotated. A pinion capable of meshing with the ring gear of the engine is provided at the tip of the sliding cylinder, and the housing is provided with a pinion that can be supported in the sliding cylinder in the rotational direction at least until the pinion starts meshing with the ring gear. A brake mechanism is provided between the housing and the sliding tube that applies a certain amount of braking force.It operates when the engagement between the binion and the ring gear is completed, and holds the sliding tube at the forward limit and prevents the pinion from moving. We have set up an early withdrawal prevention mechanism to prevent early withdrawal.
Since the housing is equipped with one common electromagnetic actuation mechanism that activates and releases the brake mechanism and early release prevention mechanism, the brake mechanism reliably advances the sliding tube, that is, the pinion, and connects it to the ring gear. The engine can be started reliably by keeping the mesh engaged by the early disengagement prevention mechanism. Furthermore, the actuation and release mechanisms of the brake mechanism and the early release prevention mechanism can be simplified, and the entire device can be made more compact.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view before operation, FIG. 2 is a sectional view taken along the line TI-II in FIG. 1, and FIG.
Figure 3 is a longitudinal side view during operation, Figure 4 is Figure 3 TV-
It is a sectional view taken along the line IV. H...housing, 5++J'2...helical spline, 1...starting motor, 13...drive shaft, 17
...Sliding tube, 21...Ring gear, 22...Pinion, 23...Brake mechanism, 28...Electromagnetic actuation mechanism, 38...Early separation prevention mechanism. Patent applicant: Sawafuji Electric Co., Ltd.

Claims (1)

[Claims] The housing rotatably supports a drive shaft that is rotationally driven by a starter motor, and also rotatably and slidably supports a sliding tube that is threaded onto the drive shaft via a helical spline. A pinion that can mesh with the ring gear of the engine is provided at the tip, and a brake mechanism is provided in the housing that applies a constant braking torque to the sliding tube only in the rotational direction at least until the pinion starts meshing with the ring gear. an early disengagement mechanism is provided between the housing and the sliding tube, which operates when the engagement between the binion and the ring gear is completed to hold the sliding tube at the forward limit and prevent early disengagement of the pinion. An inertial sliding starter device, comprising: a prevention mechanism; and a common electromagnetic actuation mechanism provided in the housing for activating and releasing the brake mechanism and the early release prevention mechanism.