CN209925141U - Electric starting device and internal combustion engine with same - Google Patents

Abstract

The utility model relates to an electric starting device, which comprises a starting motor, a power transmission mechanism and a clutch mechanism, wherein the power transmission mechanism comprises a power transmission component and an energy storage component; the power transmission assembly is constructed to include a power transmission wheel which is directly or indirectly driven by the motor; the energy storage assembly is constructed as a volute spring, and two free ends of the volute spring are respectively connected with the power transmission wheel and the clutch mechanism; the power transmission wheel is constructed to be provided with a cavity for accommodating the volute spring, and the cavity is provided with an opening; the power transmission mechanism further includes a scroll spring restraint member that forms a restraint for a scroll spring received in the cavity, the restraint preventing the scroll spring from disengaging from the cavity. The utility model discloses still relate to an internal-combustion engine with above-mentioned electric starting drive. The utility model discloses an electric starting device adds the about piece of vortex spring at the cavity of installation vortex spring, and the vortex spring is installed and is blocked after advancing the cavity, even receive external force can not the pine take off yet, has promoted the security greatly.

Description

Electric starting device and internal combustion engine with same

Technical Field

The present invention relates to an electric starter for an internal combustion engine. The invention also relates to an internal combustion engine.

Background

In the prior art, small gasoline engines are usually equipped with an electric starting device. An electric starting device generally comprises a starting motor, a power transmission mechanism and a clutch mechanism, wherein the power transmission mechanism comprises a reduction gearbox and an energy storage assembly. During the starting stage of the small gasoline engine, the torque output by the starting motor is transmitted to the energy storage assembly through the reduction gearbox, the energy storage assembly converts mechanical energy into potential energy, when the stored potential energy reaches a threshold value, the potential energy is released to the clutch mechanism instantly and rotates, and the clutch mechanism is meshed with the crankshaft and drives the crankshaft to rotate so as to start the gasoline engine. After the small gasoline engine is started, the transmission between the clutch mechanism and the crankshaft is disconnected. The reduction gearbox is typically configured as a gear set comprising a gear having a cavity capable of receiving the energy storage assembly; the energy storage assembly is usually configured such that the volute spring is accommodated in the cavity of the gear, and one end of the energy storage assembly is connected with the gear while the other end is connected with the clutch mechanism. Since the volute spring is usually assembled on the assembly site of the whole machine, when the incompletely-installed electric starting device which is already assembled with the volute spring is subjected to an unexpected external force, the volute spring is easy to loosen and bounce, and further personnel are injured. On the other hand, the on-site assembly of the volute spring causes low assembly efficiency of the whole machine. In addition, the volute spring is continuously and alternately zoomed in and out in the normal working process, and is easy to separate.

Disclosure of Invention

The invention aims to provide a power transmission mechanism with high safety coefficient and high assembly efficiency.

In order to solve the technical problem, the electric starting device comprises a starting motor, a power transmission mechanism and a clutch mechanism, wherein the power transmission mechanism comprises a power transmission assembly and an energy storage assembly; the power transmission assembly is configured to include a power transmission wheel that is directly or indirectly driven by the motor; the energy storage assembly is constructed as a volute spring, and two free ends of the volute spring are respectively connected with the power transmission wheel and the clutch mechanism; the power transmission wheel is configured to have a cavity for receiving the volute spring, the cavity having an opening; the power transmission mechanism further includes a scroll spring restraint member that forms a restraint for a scroll spring received in the cavity, the restraint preventing the scroll spring from disengaging from the cavity.

As an embodiment of the present invention, it is preferable that the scroll spring restraint is configured as a first protrusion provided on a peripheral edge of the cavity, and the third protrusion extends toward a center of the cavity.

As an embodiment of the present invention, it is preferable that the scroll spring restraint member is configured as a cover configured to engage with an opening of the cavity to form a restraint of the scroll spring received in the cavity, the restraint being such that the scroll spring cannot be detached from the cavity.

As a specific embodiment of the present invention, it is preferable that an engagement structure is provided between the cover and the cavity, and the engagement structure prevents the cover from being detached from the cavity.

As an embodiment of the present invention, it is preferable that the engaging structure includes a first convex portion and a first concave portion, and the first convex portion and the first concave portion are respectively provided on the periphery of the cover and the periphery of the cavity, and the first convex portion is configured to be able to be engaged with the first concave portion.

As an embodiment of the present invention, preferably, the engaging structure includes a second protrusion disposed on a periphery of the cavity, and the second protrusion is configured to be engaged with a circumferential edge of the cover.

As a specific embodiment of the present invention, it is preferable that the spiral spring has a spiral spring outer free end away from the center of the spiral line and a spiral spring inner free end close to the center of gravity of the spiral line; the outer free end of the volute spring is fixedly connected with the power transmission wheel, and the inner free end of the volute spring is fixedly connected with the clutch mechanism.

In an embodiment of the present invention, it is preferable that the scroll spring restraint is provided at the second groove portion.

As a specific embodiment of the present invention, it is preferable that the scroll spring restraint is configured as a fourth convex portion; the fourth protrusion extends from a side wall of the second groove portion near the rotation center of the power transmission wheel in a direction toward and/or away from the rotation center of the power transmission wheel.

As a specific embodiment of the present invention, it is preferable that the scroll spring restraint is configured as a fourth convex portion; the fourth protrusion extends from a side wall of the second groove portion away from the rotation center of the power transmission wheel in a direction toward the rotation center of the power transmission wheel.

The invention also provides an internal combustion engine, which comprises a crankshaft and an electric starting device, wherein the electric starting device comprises a starting motor, a power transmission mechanism and a clutch mechanism, and the power transmission mechanism comprises a power transmission assembly and an energy storage assembly; the power transmission assembly is configured to include a power transmission wheel that is directly or indirectly driven by the motor; the energy storage assembly is constructed as a volute spring, and two free ends of the volute spring are respectively connected with the power transmission wheel and the clutch mechanism; the power transmission wheel is configured to have a cavity for receiving the volute spring, the cavity having an opening; the power transmission mechanism further includes a scroll spring restraint member that forms a restraint for a scroll spring received in the cavity, the restraint preventing the scroll spring from disengaging from the cavity.

As a specific embodiment of the present invention, it is preferable that the power transmission assembly is configured as a gear reduction box having a reduction box chamber formed by a reduction box housing; the reduction gear box casing is formed by buckling a first casing 221 arranged on the inner side and a second casing 223 arranged on the outer side.

As a specific embodiment of the present invention, preferably, the clutch mechanism includes a pawl assembly and a ratchet assembly; the pawl assembly is fixedly connected with the crankshaft; the ratchet wheel assembly is rotatably connected with the reduction box shell.

The electric starting device is additionally provided with the vortex spring restraint piece in the cavity for mounting the vortex spring, the vortex spring is clamped after being mounted in the cavity, and the vortex spring cannot be loosened even being subjected to external force, so that the safety is greatly improved; the volute spring and the second gear can be made into an assembly, and small assembly is performed in advance, so that field assembly is avoided, and the assembly efficiency is greatly improved; the vortex spring in work can not be separated because of being continuously and alternately zoomed, and the stability of the energy storage structure is enhanced.

Drawings

Fig. 1 is an exploded view of an electric starter of the prior art.

Fig. 2 is an exploded view of the electric starter assembly of fig. 2 from another perspective.

FIG. 3 is a partially exploded view of an internal combustion engine according to an embodiment of the present invention.

Fig. 4 is a sectional view of an electric starting apparatus according to an embodiment of the present invention.

Fig. 5 is an exploded view of an energy storage device in accordance with an embodiment of the present invention.

Fig. 6 is an inside elevational view of an energy storage device in accordance with an embodiment of the invention.

Fig. 7 is a cross-sectional view taken along a-a in fig. 2.

Fig. 8 is a cross-sectional view taken along line B-B of fig. 2.

Fig. 9 is a schematic diagram of an energy storage device in accordance with an embodiment of the present invention.

Fig. 10 is a schematic view of an energy storage device according to a fourth embodiment of the present invention.

Fig. 11 is an enlarged view of a portion x1 in fig. 10.

FIG. 12 is a cross-sectional view taken along line C1-C1 of FIG. 11.

Fig. 13 is a schematic view of an energy storage device according to a fifth embodiment of the present invention.

Fig. 14 is an enlarged view of a portion x2 in fig. 13.

FIG. 15 is a cross-sectional view taken along line C2-C2 of FIG. 14.

Fig. 16 is a schematic view of an energy storage device according to a sixth embodiment of the invention.

Fig. 17 is an enlarged view of a portion x3 in fig. 16.

FIG. 18 is a cross-sectional view taken along line C3-C3 of FIG. 17.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.

It is to be understood that the terms "first," "second," and the like in the description of the embodiments of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the embodiments of the present invention, unless otherwise explicitly stated or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as a fixed connection, a movable connection, a detachable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In particular embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween.

In particular embodiments of the present invention, the term "plurality" means two or more unless explicitly stated or limited otherwise.

Fig. 1 and 2 show a typical prior art electric starter 20, and fig. 3 is referenced to an internal combustion engine 10 equipped with the electric starter 20. For convenience of description, the side of the electric starter 20 facing the crankshaft 104 of the internal combustion engine 10 is defined as the opposite "inner side", and the side facing away from the crankshaft 104 is defined as the first opposite "outer side". The electric starter 20 includes a starter motor 24, a power transmission mechanism 22, and a clutch mechanism 26.

The starter motor 24 is provided with a motor output shaft 242, and a motor output gear 246 is provided at the end of the motor output shaft 242.

The power transmission mechanism 22 includes a power transmission assembly and an energy storage assembly. The power transmission assembly is specifically configured as a gear reduction box having a reduction box chamber formed by a reduction box housing, specifically, the reduction box housing is snap-fitted by a first housing 221 provided on the inside and a second housing 223 provided on the outside. A first gear 224 rotatable about a first gear shaft 2214 and a second gear 226 rotatable about a second gear shaft 2216 are provided in the reduction box chamber. Wherein the first gear 224 is configured as a duplicate gear including a first ring gear 2242 having a larger diameter and a second ring gear 2244 having a smaller diameter, the first ring gear 2242 meshes with the ring gear of the motor output gear 246 extending into the reduction case chamber, and the second ring gear 2244 meshes with the ring gear of the second gear 226. The second gear 226 is configured with a cavity 2264, the cavity 2264 being for receiving an energy storage assembly and having an inwardly facing opening. The energy storage assembly is configured as a volute spring 222, typically a planar spiral-type spring wound from an elongated spring material having an outer volute free end distal to the center of the spiral and an inner volute free end proximal to the center of gravity of the spiral. The outer free end of the volute spring is fixedly connected with the second gear 226, and specifically, the outer free end of the volute spring is configured as a second claw 2224, and correspondingly, a second groove 2262 is disposed on the sidewall of the cavity 2264, and the second groove 2262 is matched with the second claw 2224 to fixedly connect the outer free end of the volute spring with the second gear 226.

The clutch mechanism 26 provides a one-way transmission of power, typically configured as a ratchet and pawl arrangement. Specifically, the clutch mechanism 26 includes a pawl assembly 262 and a ratchet assembly 264. The pawl assembly 262 is fixedly connected to the crankshaft 104 of the internal combustion engine 10, and the pawl portion is provided on the outer side surface of the pawl assembly 262. The ratchet assembly 264 is rotatably connected to the gearbox housing. Specifically, ratchet assembly 264 includes an integrally disposed ratchet assembly outer end 2642 and a ratchet assembly inner end 2644. Wherein, the ratchet assembly outer end 2642 and the ratchet assembly inner end 2644 are respectively disposed at two sides of the first housing 221. The outer end 2642 of the ratchet assembly is fixedly connected to the free end of the inner portion of the volute spring. Specifically, the outer end 2642 of the ratchet assembly is provided with a first slot 2642a, and correspondingly, the inner free end of the volute spring is provided with a first finger 2222, and the first slot 2642a cooperates with the first finger 2222 to fixedly connect the inner free end of the volute spring with the ratchet assembly. The inner end 2644 of the ratchet assembly is provided with a ratchet portion, which cooperates with the pawl portion to achieve unidirectional power transmission between the power transmission mechanism 22 and the crankshaft 104.

The above-described assembly of the electric starter assembly 20 is generally performed simultaneously with the assembly of the complete engine of the internal combustion engine 10. In assembling the scroll spring 222, the first step: the volute spring 222 is first tightened and installed in the cavity 2264, so that the second claw 2224 is matched with the second groove 2262; in a second step, the second gear 226 with the spiral spring 222, the first housing 221 and the ratchet assembly 264 are assembled together. Thus, the volute spring 222 is securely mounted between the second gear 226 and the first housing 221. However, as mentioned in the background of the present application, before the second step is completed, the spiral spring 222 is not securely restrained in the axial direction of the second gear 226 in the front fork 2264, so that there is a high risk that the spiral spring 222 may be ejected.

A first embodiment.

Fig. 3 ~ fig. 7 shows an embodiment of the present invention, since the present invention is an inventive improvement based on the prior art, the same reference numerals are used in fig. 4 ~ fig. 7 for the same or similar parts as those in the prior art described above, and further, for the sake of brevity and easy understanding of the present specification, detailed explanation for the same or similar structure as that in the prior art described above is not repeated.

The present embodiment provides an internal combustion engine 10 comprising a body, a piston, a connecting rod, a crankshaft 104, a valve train, a fuel supply system, a lubrication system, a cooling system, an ignition system, and a starting system, wherein the starting system comprises an electric starting apparatus 20. in the present embodiment, the internal combustion engine 10 is embodied as a gasoline engine, in the present embodiment, referring to fig. 3, the electric starting apparatus 20 is fixed to the body by a bolt 108, and a cover 106 covers the outside of the electric starting apparatus 20. referring to fig. 4 ~ fig. 7, the electric starting apparatus 20 of the present embodiment comprises a starter motor 24, a power transmission mechanism 22, and a clutch mechanism 26.

The power transmission mechanism 22 includes a power transmission wheel or a set of power transmission wheels and also includes an energy storage assembly. In this particular embodiment, the power transfer mechanism 22 includes a gear reduction box and an energy storage assembly. The gear reduction box is provided with a reduction box chamber, and the reduction box chamber accommodates a power transmission wheel or a power transmission wheel set. In the present embodiment, the power transmission wheel set is configured to include a first gear 224 and a second gear 226. First gear 224 includes a first toothed ring 2242 and a second toothed ring 2244, and second gear 226 includes a cavity 2264, the cavity 2264 having an opening. The energy storage assembly is configured as a volute spring 222.

The power transmission mechanism 22 further includes a scroll spring restraint that forms a restraint for the scroll spring 222 housed within the cavity 2264 that prevents the scroll spring 222 from disengaging from the cavity 2264. In this particular embodiment, the power transmission mechanism 22 also includes a cover 228. The cap 228 is configured to mate with an opening of the cavity 2264 to form a restraint to the scroll spring 222 received within the cavity 2264 that prevents the scroll spring 222 from disengaging the cavity 2264. Specifically, an engagement structure is provided between the cover 228 and the cavity 2264 to prevent the cover 228 from disengaging from the cavity 2264.

Referring to fig. 8, in some embodiments, the engagement structure includes a first protrusion 228a disposed on a periphery of the cover 228 and a first recess 2264a disposed on a periphery of the cavity 2264, respectively, the first protrusion 228a configured to snap-fit with the first recess 2264 a. Referring to fig. 9, in some embodiments, the engagement structure includes a second protrusion 2264b disposed on the periphery of the cavity 2264, the second protrusion 2264b configured to snap-fit with the circumferential edge of the cover 228.

In this embodiment, cover 228 is configured as an annular cover plate having a central portion with an aperture that facilitates passage of ratchet assembly outer end 2642 therethrough.

A second embodiment.

Referring to fig. 9, the present embodiment is different from the above-described first embodiment in that the scroll spring restraint is configured as a third protrusion 2264c disposed on the peripheral edge of the cavity. Specifically, the third protrusions 2264c extend toward the center of the cavity 2264 and are provided in at least two numbers. Preferably, at least two of the third protrusions 2264c are substantially evenly distributed along the circumference of the cavity 2264.

Unlike the first embodiment in which the cover 228 is used to limit the scroll spring 222, the third protrusion 2264c is directly used to limit the scroll spring 222. Specifically, after the coiled scroll spring 222 is placed in the cavity 2264, the scroll spring 222 is released to expand outward, and the outermost coil of the scroll spring 222 abuts against the inner wall of the periphery of the cavity 2264 due to the limitation of the cavity 2264. Since the third protrusion 2264c protrudes inward from the periphery of the cavity 2264c, at least the outermost coil body of the volute spring 222 can be effectively limited, and the volute spring 222 can be prevented from being accidentally disengaged.

A third embodiment.

The present embodiment differs from the first embodiment described above in that the gear reduction box in the first embodiment is replaced with a belt transmission box. Specifically, the motor output gear 246, the first gear 224, and the second gear 226 in the first embodiment are replaced with a motor output pulley, a first pulley, and a second pulley.

A fourth embodiment.

Referring to fig. 10 ~ fig. 12, the present embodiment is different from the first embodiment described above in that the scroll spring restraint is configured as at least one fourth protrusion 2262c provided at the second groove 2262. further, the fourth protrusion 2262c extends from a side wall of the second groove 2262 near the rotation center of the second gear 226 toward the rotation center of the second gear 226.

Specifically, the second groove portion 2262 is enclosed by the ring gear circumferential wall 226a, the first extension 2262a and the second extension 2262 b. The ring gear circumferential wall 226a is configured as an annular structure, which constitutes a circular body of the second gear 226. The teeth of the second gear 226 are on the outer peripheral surfaces of the ring gear peripheral walls 226a, respectively, and the cavity 2264 is defined by the inner peripheral surfaces of the ring gear peripheral walls 226 a. The first extension 2262a extends from the inner circumferential surface of the ring gear circumferential wall 226a toward the rotation center of the second gear 226. The second extension 2262b extends from the inner circumferential surface of the gear ring circumferential wall 226a to the first extension 2262a at a position axially spaced apart from the second gear 226 by a first distance, first toward the rotation center of the second gear 226 to form a first extension head, and then extends substantially parallel to the gear ring circumferential wall 226a toward the first extension 2262a to form a second extension tail. The second extension tail is spaced a third distance from the gear ring circumferential wall 226a, and the end of the second extension 2262b is spaced a second distance from the face of the first extension 2262a adjacent the second extension 2262b, the first and third distances defining the size of the second slot 2262.

The second hooks 2224 are configured as hooks formed at the outer free ends of the spiral springs 222 against the winding direction of the spiral springs 222. When the scroll spring 222 is assembled with the second gear 226, the second hook 2224 is engaged in the second groove 2262, so that the second hook 2224 and the outermost coil spring body of the scroll spring 222 are respectively located at two sides of the tail section of the second extension portion, and the bent portion between the second hook 2224 and the outermost coil spring body of the scroll spring 222 is located between the ends of the first extension portion 2262a and the second extension portion 2262 b.

In the present embodiment, the fourth protrusion 2262c is configured as a protrusion located at the tip of the second extension 2262c and extending toward the rotation center of the second gear 226. Preferably, the width of the fourth protrusion 2262c in the radial direction of the second gear 226 is not less than the thickness of the single coil spring body of the spiral spring 222 and not more than twice the thickness of the single coil spring body of the spiral spring 222. Preferably, in this embodiment, the scroll spring restraint includes only one fourth protrusion 2262 c.

Fifth embodiment.

The present embodiment is different from the fourth embodiment described above in that, referring to fig. 13 ~ and fig. 15, the fourth protrusion 2262c extends from the side wall of the second groove 2262 close to the rotation center of the second gear 226 in a direction away from the rotation center of the second gear 226, specifically, the fourth protrusion 2262c is configured as a protrusion located at the end of the second extending 2262c and extending away from the rotation center of the second gear 226.

A sixth embodiment.

The present embodiment differs from the fourth embodiment described above in that, referring to fig. 16 ~ and fig. 18, the fourth protrusion 2262c extends from the side wall of the second groove 2262 away from the rotational center of the second gear 226 toward the rotational center of the second gear 226, and the fourth protrusion 2262c is configured as a protrusion extending from the gear ring circumferential wall 226a toward the rotational center of the second gear 226 between the first extension 2262a and the first section of the second extension.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. An electric starting device comprises a starting motor, a power transmission mechanism and a clutch mechanism, wherein the power transmission mechanism comprises a power transmission assembly and an energy storage assembly; it is characterized in that the utility model is characterized in that,

the power transmission assembly is configured to include a power transmission wheel that is directly or indirectly driven by the motor; the energy storage assembly is constructed as a volute spring, and two free ends of the volute spring are respectively connected with the power transmission wheel and the clutch mechanism;

the power transmission wheel is configured to have a cavity for receiving the volute spring, the cavity having an opening;

the power transmission mechanism further includes a scroll spring restraint member that forms a restraint for a scroll spring received in the cavity, the restraint preventing the scroll spring from disengaging from the cavity.

2. An electric starter device as claimed in claim 1, wherein the spiral spring restraint is configured as a third projection disposed on the periphery of the chamber, the third projection extending towards the centre of the chamber.

3. The electric starter of claim 1 wherein the volute spring restraint is configured as a cap configured to engage the opening of the cavity to form a restraint to the volute spring received in the cavity, the restraint preventing the volute spring from disengaging the cavity.

4. The electric starter of claim 3 wherein an engagement structure is provided between the cap and the cavity, the engagement structure preventing the cap from being removed from the cavity.

5. The electric starter of claim 4 wherein the engagement structure comprises a first projection disposed on a periphery of the cover and a first recess disposed on a periphery of the cavity, respectively, the first projection configured to snap fit with the first recess.

6. The electric starter of claim 4 wherein the engagement structure includes a second projection disposed on a periphery of the cavity, the second projection configured to snap-fit with a peripheral edge of the cover.

7. The electric starter device of claim 1 wherein the spiral spring restraint is disposed at the second slot portion.

8. The electric starter device of claim 7 wherein the spiral spring restraint is configured as a fourth protrusion; the fourth protrusion extends from a side wall of the second groove portion near the rotation center of the power transmission wheel in a direction toward and/or away from the rotation center of the power transmission wheel.

9. The electric starter device of claim 7 wherein the spiral spring restraint is configured as a fourth protrusion; the fourth protrusion extends from a side wall of the second groove portion away from the rotation center of the power transmission wheel in a direction toward the rotation center of the power transmission wheel.

10. An internal combustion engine comprising a crankshaft and an electric starting apparatus, the electric starting apparatus comprising a starter motor, a power transmission mechanism and a clutch mechanism, the power transmission mechanism comprising a power transmission assembly and an energy storage assembly; it is characterized in that the utility model is characterized in that,

the power transmission assembly is configured to include a power transmission wheel that is directly or indirectly driven by the motor; the energy storage assembly is constructed as a volute spring, and two free ends of the volute spring are respectively connected with the power transmission wheel and the clutch mechanism;

the power transmission wheel is configured to have a cavity for receiving the volute spring, the cavity having an opening;

the power transmission mechanism further includes a scroll spring restraint member that forms a restraint for a scroll spring received in the cavity, the restraint preventing the scroll spring from disengaging from the cavity.

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