DE2162218A1 - Starter motor coupling with positive drive - Google Patents

Description

DI P LI N G. RUDOLF S. KODR O N-PATENTAN WALT 65 MAINZ / RHEIN, ADAM-KARRILL0N-STRA88E 30

December 13, 1971 No. 71 386

Patent application

of Mr. Jules Molliet, Arnay-le-Duo, France

Starter motor coupling with positive drive

The invention relates to a starter motor clutch with positive drive, consisting of a drive pinion and a grooved sleeve connected by a coupling, which is arranged on a grooved drive shaft of a starter motor isto

A distinction is made between the starter motor clutches and heat engine power mas cnine two groups, namely the inertial starters and the starters with positive drive «, In the case of an inertia starter, the gear wheel has internal threads and is screwed onto a bolt with an external thread that represents the drive shaft of the actual starter begins to rotate, it moves due to its moment of inertia on the one with an external thread provided bolt forward until the starter gear is in a generally with the flywheel of the heat engine engages firmly connected gear, after which the starter starts the Wilrmekraftmotor »If the When the heat engine is started, the driving gear is turned off the starter is a driven one and it moves backwards on its drive shaft to its output

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position where it is in its location by a compression spring is held.

The inertia starters have several disadvantages and are increasingly being used by starters with positive Drive replaced A major disadvantage of these inertia starters is the fact that one tooth of the gear of the starter during the movement of the starter in the longitudinal axis direction on a tooth of the ring gear can erupt, which leads to a blockage »

On a positive drive starter, a clutch fork moves the starter toward the ring gear and instantly brings the teeth of the gear of starting with those of the ring gear engaged, after which the starter motor is started. if the thermal engine is started, brings the clutch fork returns the starter to its original position and is thereby assisted by the fact that the ring gear is the driving part and the gear is the driven part.

In order to be able to move a starter on its drive shaft by means of a force of a clutch fork acting in the longitudinal axis direction, the pitch of the gearwheel must and its drive shaft must be larger than that of an inertial starter j the drive shaft is therefore more grooved or fluted than it is threaded «The coupling fork however, it is also necessary to return the starter to its starting position after the thermal engine has started to bring back «Shortly after starting the thermal engine there is a risk of excessive danger

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speed and driving too fast the starter motor and thus damage to it. If the rotation speed is too high, the starter receives too much torque, which this on the drive shaft or the gear on the ring gear can block, causing a backward movement by means of the coupling fork in the initial movement prevented

For these reasons, starter motor clutches with positive drive with a freewheel device are already available equipped, which at least partially enables angular shifts between gear and starter, whereby on the one hand the starter motor starts running at excessive speed and on the other hand blockage of the starter on the grooved drive shaft can be avoided ©

Various types of freewheel devices have been proposed Some work satisfactorily but are relatively complex and expensive ones Components,

The invention is based on the object of such freewheeling devices, sometimes called unidirectional couplings, by a simpler coupler to replace whose cost price is lower and the works with comparable reliability despite its simple construction,

This problem is solved with a starter motor clutch of the type mentioned according to the invention in that

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the coupling contains two interlocking parts, those with elastic play in rotation and in Longitudinal axis are connected to each other.

One of the interlocking parts is useful as Insertion part, the other formed as a part with a corresponding TDinsteckloch, wherein the part with insertion hole can be provided with two jaws, between which the other T-shaped part engages.

The jaws with an external groove are useful and the wings of the T-shaped part are provided with the same but wider ring external groove, in which a Seeger ring is inserted "

In the direction of rotation play and in a length direction play are advantageous built-in compression springs

The operation of the device according to the invention is the following :

The starter body must be removed for at least a brief moment long disconnect from its gear to activate the starter after starting the thermal engine by means of a Bring the clutch fork back to its original position and reduce the frictional forces and possibly very high torques of the thermal engine to be able to compensate. the Said unidirectional coupling, which enables separation in the direction of rotation, not in the direction of the longitudinal axis, is one such means for this. If the Sinrad can only rotate freely by a small angle and if this small play in the direction of rotation is achieved by a play in

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Longitudinal axis direction is compensated, each game is equipped with suitable damping means, it can be expected that the from the ring gear on the Braking force exerted by the gear wheel is reduced and that the clutch fork is like a freewheel device has the option of returning the starter to its original position. «One can say that the small Backlash in the direction of rotation compensates for the backlash in the longitudinal axis direction

Unexpectedly, it is not necessary in the described device that the game is proportionate in each case must be large in order to ensure the satisfactory operation of the coupler according to the invention « Experience has shown that even with very little play - on the order of millimeters in Longitudinal direction and from a few degrees of angle, for example 3 degrees, in the direction of rotation - the gear wheel into its starting position without the risk of excessive speed returns · This has been found in a large number of practical tests. This makes the special per se unexpected value of the invention, since one with a very compact device such small game in either direction, with a far less costly and complicated machining than is necessary for unidirectional couplings «

All that is required is that each game be appropriate buffered with damping elements, for which the following an exemplary embodiment is described in more detail with reference to the drawing «

Eb show t

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Figure 1 ι a starter motor clutch according to the invention with positive drive with an insertion part and a part with a corresponding insertion hole,

FIG. 2 t the object according to FIG. 1 partially cut and with a slightly different assignment of the two main parts to each other,

Figure 3 t the Τ _θ ιι with insertion hole in front view,

Figure h : the object according to Figure 3 in side view,

Figure 5: the plug-in part in front view and

FIG. 6 t shows the object according to FIG. 5 in a side view.

In the coupling device shown in the drawing, the gear 2 of the starter must be coupled to a sleeve 3 which is arranged on the grooved drive shaft h of the starter motor, not shown »

An approximately cylindrically shaped part 20 is firmly connected to the gear wheel 2 and has a rectangular recess 21 on the front side, which results in two jaws 27 and 28 a circular trough cut 29 (see Figure 2), the latter in their Durahmesser that of the sleeve 3 corresponds * the part 20 also has two symmetrical to the rotational axis of the gear wheel 2 and for Aohse of the part 20 arranged bores 23 and 2k *

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In the. Bate ken 27 and 28 are on the Aus sens exte the circular grooves 25 and 26 visible in FIGS. 3 and 4 are embedded.

A plug-in part 30, which is approximately T-shaped and has dimensions that allow insertion into the cuboid recess 21 of the part 20 while leaving a certain amount of play, is firmly connected to the sleeve 3. Förraigen part are designed as parts of a cylinder 33, the diameter of which corresponds to that of part 20, and are also provided with an outer ring groove Jk and 35, which is, however, wider than the circular grooves 25 and 26 of part 20. Furthermore, the wings 32 and 31 asymmetrically to the sleeve axis 3 »but to the symmetry of the part 30 asymmetrically arranged bores 36 and 37 ·

Compression springs 41, 42, 43 and kh are accommodated in the bores 231, 24, 36 and 37, respectively

The outer ring grooves 25, 26, Jk and 35 are connected to one another by an inserted Seeger ring 126 »

The coupler shown in Figures 1 and 2 is assembled in such a way that the parts 20 and 30 engage one another, the spring elements kl to kk are housed in the bores 23 # 24, 43 and 44 and the Seeger ring 126 in the Ringaussennuten 25, 26, 34 and 35 lies «, Since the outer end 38 of the sleeve 3 (see Figure 6) is located in the circular recess 29 (see Figure 2) of the part 20, this is a

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very good centering ensured the extreme end 38 but not at the bottom of this trough 29 (see Figure 1), because it is closed by the compression springs 41 and 42

is pushed back on the wings 3I and 32 of the Part 30 apply a corresponding pressure » There is thus a free play 5I »between the wings

. geln 31 and 32 and the base between the jaws 27 and 2 £ and a play 52 on the right side of the Seeger ring126 in the outer ring grooves 34 and 25 of the wings 31 and 32, since these outer ring grooves, as explained above, are wider are than the corresponding ring outer grooves 25 and 26 of the part 20 and are therefore a little too wide for the Seeger ring 126. ^r

On the other hand, the compression springs 43 and 44 acting in the same direction of rotation leave what is visible in FIG Play 53 between the wings 31 and 32 and the jaws 27 and 28 are created »

The coupling assembled in this way thus represents an articulated structure with play in the longitudinal direction and in the direction of rotation, with suspension elements in the form of compression springs 41, 42, 43 and 44 being accommodated in each case are"

-The longitudinal pressure of the suspension elements is limited by the Seeger ring 126 «Both parts are perfectly centered in one another by the in of the circular trough 29 lying outermost end 38 of Sleeve 3 acts as a shaft bearing.

At the moment of starting, one acts through an electromagnet

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or manual pull controlled coupling fork, not shown on a flange disk shown in dashed lines 54 and moves the entire starter as it goes without saying) to the left «The gear wheel 2 approaches the ring gear and meshes with this * At the end of this movement, the gear 4 hits one at the end of the grooved drive shaft 4 located stop 40. The springs 41 and 42 compress and bring the play 51 (see Figure 2) to disappear · If at the moment the gear wheel engages in the ring gear, a tooth of the gear against such that the ring gear strikes, the sleeve 3 can continue their movement by the previously relaxed compression springs 41 and 42 (see Figure 2) compresses «Since the sleeve 3 thus moves a little further, it rotates over the Springs 43 and 44 and the gear wheel sufficient so that the contact between the two teeth ceases «That The gear wheel thus meshes with the ring gear and at the end of the movement the play 51 disappears because of the stop 40 again in the manner described above: The starter engine is started and leaves the heat engine on, the springs 43 and 44 compressing each other and the game 53 disappears "

After starting, the disc of the ring gear tends to run faster than the gear wheel, # whereby the four compression springs relax simultaneously and the effect of the ring gear, which has become the driving part, "extinguishes" even if this is only for a very short time * If this is the case for a long time , this is sufficient for the clutch fork, the movement of the

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Starter from left to right into its rest position to induce «Once the rightward movement has begun, it stops also continues, since with increasing speed the starter moves to the right from the ring gear to the The effect exerted by the gearwheel is reduced · The movement directed to the right is therefore undisturbed.

309830/01 «OWQiNAL INSPECTED

Claims (2)

13 »December 1971 serial no. ₀ 71 386 Claims Starter motor coupling with positive drive, ordering from a drive pinion and one over a coupling connected corrugated sleeve which is mounted on a corrugated drive shaft of a starter motor is arranged characterized in that the coupling has two interlocking Contains parts (20,30) with elastic play in the direction of rotation (53) and in Longitudinal axis direction (5I »5 ^) connected to one another are. 2. Starter motor coupling according to claim 1, characterized in that that one of the interlocking parts (30) as an insertion part, the other as part (20) with corresponding insertion hole is formed. 3ο starter motor coupling according to claim 1 and / or claim 2, characterized in that the T _e ii is provided with an insertion hole (20) with two jaws (27, 28) between which the other T-shaped part (30) engages . hο starter motor coupling according to one or more of the preceding claims 1 to 3t, characterized in that the jaws (27,28) with an annular outer groove (25,26) and the wings (31,32) of the T-shaped part (30) with a similar one , but wider sized .Ringaußennut (3 ^ · »35) are provided, in which a Seeger Rhg (126) is inserted together. 209830/0583 Starter motor clutch according to claim 1, characterized in that compression springs (41, 42, 43 and kk) are installed in the rotational play (53) and in a longitudinal play (5I). 209830/05 6 3