RU2680878C1 - Starter free-wheel clutch - Google Patents

Abstract

FIELD: motor vehicle industry.SUBSTANCE: invention relates to machine building and can be used in construction of starters for internal combustion engines of automobiles. Starter free-wheel clutch contains a gear mounted on the starter shaft with the possibility of moving it in the axial direction and an overrunning friction clutch. Specified clutch is provided with elements of communication of its driving and driven elements with the starter shaft and gear. Freewheel friction clutch incorporates at least one self-retracting spring. Specified spring contains areas of self-tightening on the leading and driven elements with a function of its coupling with the gear and/or made in one piece with the driving element of the friction clutch with a function of the coupling element with the starter shaft or with the driven member.EFFECT: enabling the design simplification.4 cl, 15 dwg

Description

The invention relates to the field of automotive industry and can be used in the construction of starters of internal combustion engines (ICE) of cars.

Known movable free-wheeling clutches of the starter (MCXS), containing a gear and an overrunning clutch, the leading element of which is equipped with a coupling element with a starter shaft in the form of a splined sleeve (Akimov S.V., Chizhkov Yu.P. Electrical equipment of automobiles. Textbook for universities. - M .: CJSC “KZhI“ Driving ”, 2004. - 384 pp., Ill., Fig. 4.17-4.18, pp. 147-148). A common drawback of such MCXS is the design complexity of the MCXC itself and the starter shafts in the area of their location, since the axial mobility of the MCXC requires a smooth part of a smaller diameter on the starter shaft to fit the pinion gear and an enlarged spline part to fit the splined sleeve.

The closest technical solution to the claimed one is axially movable axially mounted on the starter’s axle shaft MCXS (RF Patent No. RU 2274781 IPC F16D 41/06, publ. 04/20/06. B-11), containing a gear mounted on the starter shaft it in the axial direction, and an overrunning friction clutch (OMT), equipped with coupling elements of its driving and driven elements, respectively, with the starter shaft and gear, in which the gear is integral with the driven OMT element and their coupling element, moment transmission elements The springs are spring-loaded rollers, and the coupling element of the OMT driving element with the starter shaft is a splined sleeve. In addition to the previously described one, the drawback of such a MCS is the inherent OMT of a roller type, a tendency to displace and skew the axes of its driving and driven elements, due to the property of their relative self-installation in the overtaking mode and aggravated by the axial distance of the seats of the sleeve and gear, which requires an increase in the number and radius of location rollers by the criterion of durability, and, as a result, leads to a complication of the design and an increase in the dimensions of the MCXS itself and starter elements in the zone of its location.

The basis of the invention is the task of increasing the durability of the Ministry of Agriculture, simplifying the design and reducing the dimensions of the Ministry of Agriculture and starter elements in the zone of its location.

The technical result is achieved by the fact that in the Ministry of Agriculture, containing gear mounted on the starter shaft, with the possibility of moving it in the axial direction, and OMT, equipped with communication elements of its leading and driven elements with the starter shaft and gear:

- OMT contains at least one self-tightening spring containing self-tightening sections on the leading and driven elements with the function of the element of its connection with the gear, and / or made in one piece with the leading element of the overrunning friction clutch with the function of the element of communication with the shaft starter or driven element;

the self-tightening spring is equipped with additional oppositely directed turns of unloading of the leading element of the overrunning friction clutch integral with them with the function of a coupling element with a shaft or a driven OMT element;

- MCXS is made sliding, with an axially movable coupling element of the driven OMT element with the gear, and in this case, the function of the leading OMT element together with the function of its communication element with the starter shaft is performed by the section of the starter shaft in contact with the self-tightening spring;

- MCXS is made detachable on the contact surface of the free-running section of the self-tightening spring with the leading or driven OMT element, equipped with a section for capturing the end turn of the free-running section of the self-tightening spring, and the MCS is equipped with a gear synchronization mechanism for gearing it with the engine flywheel crown. The invention is illustrated by drawings.

FIG. 1, 2. Variants of the mobile MCXS with an OMT coupling element with a starter shaft in the form of a splined sleeve.

FIG. 3. Mobile MCHS with OMT leading element made in one piece with a self-tightening spring

FIG. 4, 5, 6, 7, 8. Section A-A of FIG. 3. Options for the connection of a self-tightening spring with a starter shaft.

FIG. 9. Sliding axially in the Ministry of Agriculture.

FIG. 10. Section AA from FIG. 9. Variants of the connection of a self-tightening spring with an OMT connection element with a gear.

FIG. 11. MKShS with additional turns of unloading of the leading OMT element.

FIG. 12. Section AA from FIG. 11. Additional turns of unloading of the leading OMT element.

FIG. 13, 14 Detachable MCXS in the initial and working positions.

FIG. 15. View A of FIG. 14. Capture portion of the end turn of the overtaking portion of the self-tightening spring.

The structure of the Ministry of Agriculture - mobile (Fig. 1, 2, 3, 11), sliding (Fig. 9) or detachable (Fig. 13-15), depending on their features, include those differing in their design:

- gear 1 (Fig. 1-3, 9, 11, 13, 14) installed along the landing on shaft 2;

- OMT with a self-tightening spring 3 (Fig. 1-3, 9-11, 13-15), including the leading element 4 (Fig. 1, 2) with element 5 (Fig. 1, 2) of its connection with the starter shaft 2 ( Fig. 1-15) or the leading element 6 (Fig. 3-15) with the function of the element of its connection with the starter shaft 2, and the driven element 7 (Fig. 9, 10) with the element 8 (Fig. 9, 10) of its connection with gear 1 or driven element 9 (Fig. 1-8, 11-15) with the function of the element of its connection with gear 1;

- elements of axial coupling, providing the movement of the movable MCXS as a whole (Figs. 1-3, 11), and limiting the relative movement of the movable and axially stationary elements of the sliding MCXC (Fig. 9);

- elements for limiting the misalignment of the axes of the OMT elements relative to each other or to the axis of the starter shaft 2 (Figs. 1-3, 9, 11), designed to reduce the landing load "gear 1 - starter shaft 2";

- elements of the device for synchronizing the gearing of the gear with the crown of the flywheel of the internal combustion engine in detachable MCHS (Fig. 13, 14).

The leading element 4 OMT is made in the form of:

- a spline sleeve (Fig. 1), on the outer surface of which the irreversible self-tightening section L1 of the self-tightening spring 3 is fixedly fixed;

spline sleeve (Fig. 2), the outer surface of which is in contact with the overtaking portion of self-tightening L2 self-tightening spring 3.

The leading element 6 OMT with the function of the element of its connection with the starter shaft 2 is made in the form:

- the end of the self-tightening spring 3 bent in the direction of the shaft 2 and entering into its helical groove (Fig. 3-8, 11, 12);

a portion of the shaft 2 in contact with the overtaking portion of the self-tightening L2 of the self-tightening spring 3 (Fig. 9);

- fixed bushings on the shaft 2 of the sleeve (Fig. 13, 14).

The driven element 7 OMT is made in the form of a bent outward end of a self-tightening spring 3 (Fig. 9, 10).

The driven element 9 OMT with the function of the element of its connection with the gear 1 is made in the form:

- made in one piece with the gear 1 of the sleeve in contact with the overtaking section of self-tightening L2 self-tightening spring 3 (Fig. 2, 13-15);

- made in one piece with the gear 1 of the sleeve, on the outer surface of which the irrevocable self-tightening section L1 of the self-tightening spring 3 is fixedly fixed (Fig. 1);

- rigidly connected to the gear 1 of the sleeve, the inner surface of which is in contact with the working on the distribution section L2 self-tightening spring 3 (Fig. 3, 4-8, 11, 12).

The communication element 5 of the leading element 4 OMT with the shaft 2 of the starter is made in the form of splines located on the inner surface of the sleeve, performing the function of the leading element 4 OMT (Fig. 1, 2).

The communication element 8 of the driven element 7 OMT with gear 1 is made in the form of a sleeve rigidly connected to the gear 1 and having a helical groove for engagement with the driven element 7 OMT (Fig. 9, 10).

Self-locking spring 3 contains:

- end overtaking section of self-tightening L2, working for crimping (Fig. 1, 2, 9, 11, 13-15) or for distribution (Figs. 3-8, 10, 11), on which are installed with a preliminary radial tightness and experiencing In connection with this, bending strains of the coil can either slip over the surface of the connected OMT element or self-tighten on it in the transmission mode of the starting torque, and the boundary of this section, remote from the end of the spring 3, is the point A of the greatest load, where the maximum magnitude of stress Elenia

- irrevocable section of self-tightening L1 (Fig. 1, 2, 13, 14), on which the conditions for securing the turns exclude the possibility of its rotation relative to the associated leading 4 (Fig. 2, 13, 14) or slave 9 (Fig. 1) elements OMT;

- bent end, performing the function of the leading element 6 OMT (Fig. 3, 4-8, 11) or the function of the driven element 7 OMT (Fig. 9, 10), and its shape and dimensions provide free axial movement in the grooves and slots of adjacent elements OMT or starter shaft 2;

- plot L3 of additional unloading turns installed with a gap g (Fig. 11, 12) of the bent end of the spring 3, which is integral with them and performing the function of the OMT driving element 6, and the gap g excludes the coils landing on the starter shaft 2 and their self-tightening on it when the magnitude of the moment on the shaft 2 of the starter, comprising less than half the maximum starting torque.

The composition of the axial coupling elements of the mobile MCHS includes:

- a split retaining ring 10 (Fig. 1), the halves of which are embedded in the groove of the gear 1, forming a lock, and a sealed cup 11, covering the leading 4 and driven 9 OMT elements;

- a retaining ring 12 located in the area of the telescopic connection (Fig. 2) of the leading 4 and driven 9 OMT elements;

The composition of the elements for limiting the distortions of the axes of the OMT elements relative to each other or to the axis of the starter shaft 2 includes:

- elements of the telescopic connection of the leading 4 and the driven 9 OMT elements (Fig. 1, 2), designed to exclude the relative displacement of the latter when the spring 3 is self-tightening, and the minimum clearance in it should provide separate rotation of these elements with slight distortions of their axes due to gaps in their landings on the shaft 2 starter;

- the sleeve 13 (Fig. 3), rigidly connected with the driven element 9 OMT and having a landing fit on the shaft 2 of the starter;

the surface of the self-tightening spring 3, which, depending on the direction of self-tightening, has a landing fit along the starter shaft 2 (Fig. 3, 11) or along the sleeve that performs the function of the OMT communication element 8 with gear 1 (Fig. 9).

A feature of the detachable MCXS (Fig. 13, 14) is that in the initial position and at the stage of putting the gear into gear, the OMT is open and does not provide the possibility of transmitting torque for synchronizing the gearing of the gear and the crown of the ICE flywheel. To perform the synchronization function, a synchronization device in the form of a self-tightening spring 14 is introduced into the detachable MCXS, the bent end of which interacts with the protrusion 15 on the end surface of the gear 1.

The best, according to the criteria of the minimum moment transmitted from the gear 1 to the starter shaft 2, and heat generation during overtaking, the results are provided at the minimum possible, taking into account technological errors, radial tightness on the overtaking section of the self-tightening spring 3, which is ensured by the maximum allowable diameter limits and the number of turns.

Best results in terms of durability

at:

- the minimum values of the contact pressure of the turns and the bent ends of the self-tightening spring on the contact surfaces of the OMT elements and the starter shaft;

- creating conditions for the lubrication of the surfaces of the spring and the OMT element in contact with it in the overtaking area, under conditions of their micro displacements in self-tightening modes;

- the use of two or more axisymmetrically loaded self-tightening springs 3 (Figs. 4-8, 10), regardless of the method of their placement - by inserting into each other or sequentially along the axis;

- the use of unloading coils, regardless of how they are laid - along the axis or with a second layer inside or outside the coils of the overtaking section.

In the best way, the immobility of the connection in structures with several turns on the irrevocable section L1 (Fig. 1, 2, 13, 14) is ensured by increasing the radial tightness of its turns on the associated OMT elements.

The declared MCHS work by implementing the following sequence of stages of the ICE start-up cycle as part of the starter:

- supply of the MCHS gear from the initial position to the ring gear of the ICE flywheel (not shown in the drawings) until the end surfaces of the teeth touch;

- synchronization of the gearing of the MCXS gear and the engine flywheel crown by turning the relative motionless ring of the engine flywheel until the gear teeth coincide with the troughs between the ring teeth;

- input gears meshing with the crown of the flywheel of the internal combustion engine to the full width of the teeth;

an increase in torque on the MCXS gear to a value that ensures the beginning of the internal combustion engine cranking;

- cranking the ICE by transmitting the starting torque from the starter shaft through the MCX to the ICE flywheel;

- unloading of the MCXS elements from the starting moment;

- transition to the overtaking mode - uncoupling of the gear, which received high-speed rotation from the flywheel of the launched ICE, and the starter shaft to avoid damage to the starter elements;

- removing the gear from the engagement with the flywheel of the ICE and returning the MCX to its original position in cases of successful or failed launches of the ICE.

At the stage of supplying gear 1 to the ring gear of the ICE flywheel by moving the sleeve 16 to the left (Figs. 1-3, 9, 11, 13, 14), which transfers the axial force from the retractor starter relay (not shown in the drawings):

- movable MCHS move with rotation relative to the fixed shaft 2 of the starter at an angle determined by the screw slots (Figs. 1, 2, 11) or grooves (Fig. 3) on the fixed shaft 2 of the starter, due to the interaction of their surfaces with the leading 6 (Fig. 3, 11) OMT elements or communication elements 5 (Fig. 1, 2) OMT with starter shaft 2;

- in the sliding MCXS (Fig. 9), the gear 1 and the sleeve 8 of the element of its connection with the OMT driven element 7 are rotated relative to the fixed shaft 2 of the starter and the fixed self-tightening spring 3 by an angle determined by the helical groove in the sleeve 8, due to the interaction of the surface of this a groove with an OMT driven element 7 made in the form of a bent end (or splines) of a self-tightening spring 3;

- in a detachable MCXS (Fig. 13, 14), the gear 1 moves without rotation relative to the fixed shaft 2 of the starter while maintaining the possibility of engagement of the protrusion 15 of the gear 1 with the bent end of the self-tightening spring 14.

The stage of synchronization of gearing of gear 1 (Figs. 1-3, 9, 11, 13, 14) and the crown of the ICE flywheel starts from the moment of supplying power to the starter motor, when a gradual increase in torque on its shaft 2, when stationary, due to braking about the flywheel crown, gear 1, leads to loading of the MCXS with this moment, and the beginning of self-tightening of the 3 OMT spring in movable and sliding MCXCs (Figs. 1-3, 9, 11) and spring 14 of the synchronization device in detachable MCXCs (Figs. 13, 14) . In this case, self-tightening springs 3 and 14 perceive and transmit this torque through the interaction of their bent ends (or splines) with the OMT response elements (Fig. 9, 13, 14) or starter shaft 2 (Fig. 3, 11), as well as by friction of the turns on the surfaces in contact with them (Fig. 1, 2), which is a consequence of the presence of a preliminary radial interference and the resulting pressure of the turns on these surfaces. The wire of self-tightening turns of springs 3 and 14 in the area adjacent to point A of the highest load experiences compression or tensile strains, depending on the direction of self-tightening, to crimp (Fig. 1, 2, 10) or to distribute (Fig. 3, 11) , slides along the surfaces of OMT elements in contact with them, increases the pressure on them in excess of the value determined by the radial interference, moreover:

- the length of such zones, measured along the axis of the wire from point A of the highest load, increases with increasing transmitted moment;

- the values of axial forces, deformations and slippage vary from the maximum value proportional to the current moment, reached at the point A of the greatest load, to zero at the boundary of the deformation zone, and the pressure of the turns on the surfaces in contact with them - from the maximum value to the value determined by the preliminary radial interference;

- the amount of slippage at point A (Fig. 1, 2, 4-8, 10) of the greatest load of a self-tightening spring has a significant effect on the wear of surfaces in contact with self-tightening turns, especially on the irrevocable section L1 in movable MCS, therefore, as much as possible is assigned on this section possible radial interference and can be applied fixing or engagement of the final turn in order to minimize the length of the slip zone.

When using several axisymmetrically loaded self-tightening springs (Fig. 4, 10) as part of an OMT or synchronization device, the force exerted on them by the moment is distributed between them, excluding the misalignment of the axes of the OMT elements relative to each other and relative to the axis of the starter shaft 2, as well as the axis of the gear 1 relative to the axis of the shaft 2 of the starter. Under non-axisymmetric loading, for example, when using one spring, the absence of skew is provided by elements of its limitation (Figs. 1-3, 9, 11).

The appearance of torque at the synchronization stage also leads to a decrease in the gap r (Fig. 12) between the starter shaft 2 and additional unloading turns of the bent end of the spring 3 in the section L3 (Fig. 11), which, in this case, acts as a torsion spring, not touching the turns of the shaft 2 of the starter. Due to the need to preserve the mobility of the spring 3 relative to the shaft 2 at this and the subsequent stages, the gap r between it and the surface of the turns is selected based on the analysis of the dynamics of increase in the starter torque from the condition that their self-tightening begins only after gear 1 is fully engaged with the crown ICE flywheel, when the moment developed by the starter exceeds the amount necessary to fit these turns on its shaft 2.

The synchronization process is ensured by the fact that the moment acting on the starter shaft 2 exceeds the moment from the friction resistance of the end surfaces of the teeth of gear 1 and the flywheel when the starter shaft 2, together with the entire MCX, rotates relative to the stationary crown, and continues until the gear teeth coincide with the troughs between the teeth of the crown of the internal combustion engine.

The step of introducing the gear 1 into engagement with the engine flywheel crown to the full tooth width is realized by moving the sleeve 16 to the left (Figs. 1-3, 9, 11, 13, 14) under the action of the axial force generated by the retractor relay with a continuously increasing torque on the shaft 2 starters. Wherein:

- in the movable and sliding MCHS, the helical shape of the splines (Fig. 1, 2, 5-8, 9, 11) and grooves (Fig. 3, 4) provides the axial component of the force acting on their surface in the direction of gear 1 engaging with the crown ICE flywheel;

- in detachable MCXS (Fig. 13, 14), the gear 1 moves along the shaft 2, receiving a torque from it until its protrusion 15 comes out of contact with the bent end of the self-tightening spring 14, after which the shaft 2 gets free rotation with a set of revolutions, and the spring 14 is unloaded from the moment acting on it, which is accompanied by processes opposite to self-tightening.

The gear engaging step 1 is completed when:

- reaching the final position of the gears 1 in the movable and sliding MCXS (Figs. 1-3, 9, 11);

- contacting the end coil of the overtaking portion of the self-tightening spring 3 with the grip portion 17 of this coil located on the driven OMT element 9 in detachable MCXS (Fig. 13-15). In this case, a prerequisite for completing the input of gear 1 into engagement for detachable MCXS is the contact of the slave 9 and the leading 4 OMT elements with the possible formation of a regulated gap a (Fig. 15), and the gap d is selected so that reaching the end coil of the spring 3 with the section capture 17 and the occurrence in the end turn sufficient to start self-tightening of the radial interference did not begin before the completion of the process of putting gear 1 into engagement.

At the stage of increasing the moment on the gear 1, as the torque developed by the starter increases, the process of self-tightening of the turns of the self-tightening spring 3 continues, including additional unloading turns in the section L3 (Fig. 11), as well as part of the turns of the non-revolving section L2. In this case, the OMT elements in contact with the spring 3 are displaced by an insignificant angle due to deformation of the wire and slipping of the turns along the surfaces in contact with them, and the gear 1 of the detachable MCXS (Fig. 14, 15) and the entire movable MCXC (Fig. 9) with unloading coils lose the possibility of axial movement relative to the shaft 2 of the starter.

The stage of cranking the ICE flywheel begins when the moment developed by the starter shaft 2 transmitted through the MCXS exceeds the resistance of the ICE mechanisms and ends when the starter motor is disconnected, unloading the MCXC from the starting moment and switching it to overtaking mode in case of successful ICE start and subsequent pinion 1 out of engagement, or immediately into gear 1 out of engagement mode during a failed start.

At the stage of unloading from the starting moment, as the moment drops on the starter shaft 2, the OMT elements gradually come into contact with the elements of the self-tightening spring 3, and the spring 3 itself, including the unloading turns in section L3, which is accompanied by processes opposite to the processes of the stage loading. As a result of unloading, the gear 1 of the detachable MCXS (Fig. 14, 15) and the entire movable MCXC (Fig. 9) with unloading turns return the possibility of axial movement along the shaft 2.

At the stage of transition to the overtaking mode, after the ICE has successfully started, gear 1 (Figs. 1-3, 9, 11, 13, 14) starts to rotate at a speed greater than the starter shaft 2, which is accompanied by loading of the coils of the spring 3 in the opposite direction of self-tightening. The wire of self-tightening turns of the spring in the area adjacent to point A of the highest load begins to experience strains opposite to strains during self-tightening, slip along the surfaces in contact with them in the opposite direction of self-tightening, and reduce the pressure caused by the radial tightness, moreover, on the overtaking section L2 of the spring 3:

- the length of this zone, measured along the axis of the wire from point A of the highest load, increases almost to the last turn, which then begins to slide along the surface in contact with it;

- the turns in this zone are loaded with a moment that creates bending stresses in the wire that exceed the bending stresses due to the radial tension, and therefore cease to press on the surface in contact with them and create a moment from friction forces;

- the final value of the loading turn of the unloading moment is determined by the radial interference of the extreme turn, which, unlike other turns of the overtaking section, does not lose contact with the counter surface and slides along it, creating this moment transmitted to the starter shaft 2.

The unloading moment created by the final turn of the overtaking section L2 of the spring 3 acts on the turns of its discharge section L3 (Fig. 11), increasing the gap between them and the starter shaft 2, creates a force at the points of contact of its bent ends and splines with the OMT elements (Fig. 9, 13, 14) or starter shaft 2 (Fig. 3, 11), reduces the radial interference on the part of the turns of the non-revolving section L1, having a radial tension not exceeding the interference of the final turn of the overtaking section L2, and the remaining turns of the non-revolving section L1 retain the radial ny interference.

The stage of withdrawing gear 1 from engagement with the engine flywheel crown starts from the moment of removing power from the electric motor and the starter retractor by moving the sleeve 16 to the right (Figs. 1-3, 9, 11, 13, 14), and its features depend on the results of the previous steps .

Upon successful start of the internal combustion engine, when the crown of its flywheel rotates gear 1, the OMT transmits the unloading moment, determined by the radial tightness of the extreme turn of the overtaking section L1 of the self-tightening spring 3, from gear 1 to shaft 2 (Fig. 1, 2, 14), the rotation speed of which is determined this moment and the resistance of the starter mechanisms, and should be minimized by the criterion of durability. Wherein:

- in the movable and sliding MCHS, the helical shape of the splines (Fig. 1, 2, 5-8, 11, 12) and grooves (Figs. 3, 4, 9) provides the axial component of the force acting on their surface in the direction of the output of the gear 1 out of engagement with the crown of the flywheel of the internal combustion engine, disappearing after complete disengagement, when the return of the MCXS to its original state occurs under the action of the sleeve 16 moving to the right;

- in detachable MCXS (Fig. 13, 14), the end coil of the overtaking section L2 of the self-tightening spring 3 comes out of contact with the capture section 17 of this coil located on the OMT slave 9 (Fig. 13-15), as a result of which the spring 3 is unloaded from the unloading moment, then the rotating gear 1 moves along the shaft 2 without transmitting this moment to it, and after complete disengagement, rotating by inertia, reaches the angular position relative to the shaft 2 when its protrusion 15 comes into contact with the bent end of the self-tightening spring 14 synchronization, after which the MCX returns to its original state under the action of the sleeve 16 moving to the right.

In the event of a failed start of the internal combustion engine, the output of gear 1 from the engagement with the stationary crown of the flywheel of the internal combustion engine begins with the shaft 2 of the starter stationary, while:

- in movable and sliding MCXS, due to the helical shape of the slots (Fig. 1, 2, 5-8, 11, 12) and grooves (Fig. 3, 4, 9), on the MCXC and starter shaft 2 until the gear 1 comes out completely an unloading moment acts, which leads to a small angle rotation of the starter shaft 2 or OMT in the overtaking mode, after which the MCX returns to its original state under the action of the sleeve 16 moving to the right;

- in detachable MCXS (Fig. 13, 14), the movement of gear 1 occurs freely from the moment the end coil of the overtaking section L2 of the self-tightening spring 3 comes out of contact with the capture section 17 of this coil located on the OMT slave 9 (Fig. 13-15), as a result of which the Ministry of Agriculture returns to its original state;

- for a detachable MCXS (Fig. 13, 14), a variant is possible in which the protrusion 15 of the gear 1 abuts against the end of the self-tightening spring 14 and the gear 1 does not completely come out of engagement with the crown of the ICE flywheel, and this position of the MCX is not emergency, since the next attempt start-up will begin immediately from the stage of full engagement of gear 1 and the crown of the engine flywheel.

The declared MCXS can significantly reduce the cost of both the MCXC itself, by simplifying the design and starter elements by eliminating the need to carry out technologically complex elements on its shaft and reducing the dimensions of the material-intensive starter elements in the MCXS location zone.

Claims (4)

1. A freewheel for the starter, comprising a gear mounted on the starter shaft with the possibility of axial movement and an overrunning friction clutch, equipped with coupling elements for its driving and driven elements with the starter shaft and gear, characterized in that the overrunning friction clutch includes at least one self-tightening spring containing self-tightening sections on the driving and driven elements with the function of the element of its connection with the gear and / or made integrally with the driving element of the overrunning clutch s with the friction member due to the function of the starter shaft or the driven element. 2. The starter overrunning clutch according to claim 1, characterized in that the self-tightening spring is provided with additional oppositely directed unloading turns of the leading element of the freewheel clutch with the function of the coupling element with the shaft or driven element of the freewheel clutch. 3. The starter freewheel according to claim 1, characterized in that it is sliding with an axially movable coupling element of the driven element with the gear, and the contact element of the overrunning friction clutch together with the function of its coupling element with the starter shaft is contacted with a self-tightening spring a section of a starter shaft. 4. The starter freewheel according to claim 1, characterized in that it is detachable on the contact surface of the overrun section of the self-tightening spring with a driving or driven element of the overrunning friction clutch, equipped with a section for capturing the end turn of the overrun section of the self-tightening spring, and the freewheel the starter is equipped with a synchronization device for gearing its gears with the flywheel of the internal combustion engine.

Images