Engine starting device

Abstract

The invention relates to an engine starting device, which belongs to the field of engine starting equipment and comprises a starting motor in transmission connection with an output end of an engine crankshaft, a driving gear is mounted on a main shaft of the starting motor, the driving gear is in meshed connection with a gear disc, and the gear disc is sleeved on a centering rotating shaft in a running fit manner; the end of the centering rotating shaft is detachably connected with the output end of the crankshaft in a transmission mode, a transmission disc used for being connected with the gear disc is further fixed to the centering rotating shaft, the transmission disc and the gear disc are axially and elastically connected together, and when the rotating speed of the centering rotating shaft is higher than that of the gear disc driven by the starting motor under driving of the crankshaft, the transmission disc is driven by the crankshaft. And the transmission disc and the gear disc relatively rotate and slip. The device is compact in overall structure, an engine can be quickly started, and connection with a starting motor can be automatically disconnected.

Description

Technical Field

[0001] The invention relates to the field of engine starting equipment, in particular to an engine starting device. Background Art

[0002] Currently, there are three main modes of new energy: pure electric, dual-purpose oil and electricity, and range extender. Among them, the range extender is mainly driven by an electric motor, and the engine acts as a generator to charge the battery during driving. Generally, a generator is installed on the flywheel side of the engine, and the rotation of the engine drives the generator to generate electricity.

[0003] However, when the engine is tested offline, the engine is generally not equipped with a motor. Since the start of the range extender engine is achieved by driving the engine in reverse to start the ignition, the engine itself is no longer equipped with a starter. When the engine is tested offline, the ignition cannot be started to perform the corresponding test. For this reason, a general method is to fix a drive motor at the end of the test bench to start the engine. However, this method is costly and requires high accuracy in the centering of the bench. Summary of the invention

[0004] In view of the introduction of the above technical status, the purpose of the present invention is to provide an engine starting device to better solve the technical problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, an engine starting device adopted by the present invention includes a starting motor for transmission connection with the output end of the engine crankshaft, a driving gear is installed on the main shaft of the starting motor, the driving gear is meshed with a gear plate, the gear plate is rotatably sleeved on a centering shaft, the end of the centering shaft is detachably transmission connected with the output end of the crankshaft, a transmission plate for connecting the gear plate is also fixed on the centering shaft, and the transmission plate and the gear plate are axially elastically connected together, when the centering shaft is driven by the crankshaft and the speed is higher than the gear plate driven by the starting motor, the transmission plate and the gear plate rotate relative to each other and slip.

[0006] Furthermore, the end of the centering shaft has a spline structure, and the spline structure is drivingly connected to the end of the crankshaft output end.

[0007] Furthermore, the starter motor is mounted on one side of an end face of a mounting bracket, the mounting bracket is detachably mounted on the crankshaft output end of the engine, and the centering shaft is rotatably mounted on the bracket; the bracket has a plurality of connecting ear plates, each connecting ear plate has a screw hole, and the bracket is detachably mounted on the end face of the output end of the engine by passing bolts through the screw holes.

[0008] Furthermore, a cylindrical blind hole is provided in the end surface of the transmission plate facing the gear plate, a pressure spring is coaxially installed in the cylindrical blind hole, and a permanent magnet is installed in the hole wall of the cylindrical blind hole; the transmission plate and the gear plate are axially connected together by a plurality of sliding bolts in an annular array, and the pressure spring is always in a compressed state; an annular groove is provided in the end surface of the gear plate, and the nuts of all the sliding bolts are located in the annular groove in smooth contact, and when the crankshaft speed is higher than the speed of the gear plate driven by the starter motor, the nuts can slide circumferentially in the annular groove and can always be separated from the annular groove.

[0009] Furthermore, a closed conductive frame connected end to end is provided in the cylindrical blind hole, and the conductive frame is fixed on the end face of the gear plate; the centering shaft and the transmission plate are connected together through a locking tongue installed elastically and telescopically, and an electromagnet inside the centering shaft for controlling the locking tongue to retract is connected in series to the conductive frame to form a closed circuit with an electromagnet, and when the conductive frame rotates relative to the transmission plate together with the gear plate, the conductive frame cuts the magnetic flux lines of the permanent magnet to generate an induced current, so that the electromagnet is energized to generate an attractive force on the locking tongue.

[0010] Furthermore, the centering shaft has a groove in the radial direction, a push spring is installed in the groove, the bottom end of the push spring is connected to a positioning step in the groove, and the other end is connected to the locking tongue that extends out of the centering shaft under normal conditions; the electromagnet is embedded in the bottom of the groove, and the electromagnet is tightened by a locking nut threadedly installed in the groove, and the top end of the locking nut has a limiting column for contacting the locking tongue.

[0011] Furthermore, the permanent magnets are arranged in a ring array in the hole wall of the cylindrical blind hole, and the polarities of the ends facing each other are opposite.

[0012] Furthermore, the conductive frame includes a pair of Π-shaped raised segments, each of the two raised segments is connected to a corresponding conductive ring, the interiors of the two conductive rings are axially penetrated by the centering shaft without contact, the first conductive ring is fixed in the gear plate, and the second conductive ring is freely located in the cylindrical blind hole without contacting other components.

[0013] Furthermore, an insulating cup cover is embedded and fixed in the end face of the gear plate, and the bottom of the insulating cup cover has an annular mounting groove. The first conductive ring is coaxially installed in the annular mounting groove, and its end is axially pressed and fixed by a locking ring threadedly installed in the insulating cup cover.

[0014] Furthermore, two second conductive rings are provided, which are respectively fixed to the ends on the same side of the two raised sections, and the two second conductive rings are coaxially arranged with each other, and the inner walls of the two second conductive rings have an annular guide groove, and each annular guide groove is slidably matched with a corresponding conductive column inside it, and the conductive column is fixed in an insulating base embedded in the centering shaft, and the two conductive columns are respectively connected to the two ends of the electromagnet through corresponding insulating wires.

[0015] The engine starting device of the present invention can be used alone for offline engine detection, or can be adaptively installed on a new energy hybrid electric vehicle. When the power motor stops or is about to stop, the starting motor starts and switches to the fuel engine driving state. Specifically, the engine starting device of the present invention comes with a test gear ring, that is, a gear plate, which can meet the situation where the engine cannot be driven without a starting gear ring, and the tooling also has a positioning shaft, which is used as a centering tooling during testing, and can also avoid damaging the dual-mass flywheel when testing the engine with a dual-mass flywheel. In addition, the present invention is also provided with a special protection mechanism. After starting the engine, the gear plate and the starting motor will not rotate at high speed, and the connection can be disconnected immediately to play a protective role. Moreover, this working mechanism of disconnecting the transmission connection is based on automatic disconnection when the engine crankshaft starts to work normally, which is very clever. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following are auxiliary illustrations for explaining some specific embodiments of the present invention. The drawings described are mainly the principles of the specific operation execution structures or methods of some embodiments of the present invention. However, this does not mean that the physical structure or operation steps of the present invention can only be as shown in the drawings.

[0017] Figure 1 It is a schematic diagram of an installation structure of the present invention on an engine; Figure 2 It is a local transmission structure diagram of the present invention; Figure 3-Figure 4 These are two transmission structure diagrams between the gear plate and the centering shaft of the present invention; Figure 5 yes Figure 4 A magnified view of the structure at center A; Figure 6 It is a schematic end view of the connection between the second conductive ring and the raised section of the conductive frame.

[0018] Component number explanation: driving motor 1, gear plate 2, centering shaft 3, transmission plate 4, connecting ear plate 401, sliding bolt 5, nut 6, pressure spring 7, permanent magnet 8, conductive frame 9, raised section 901, second conductive ring 902, annular slide groove 90201, first conductive ring 903, insulating cup cover 10, protruding ring 11, locking ring 12, conductive column 13, insulating base 14, wire 15, mounting frame 16, locking tongue 17, groove 18, push spring 19, electromagnet 20, locking nut 21, limit column 22, conductive frame 23, insulating ring 24. DETAILED DESCRIPTION

[0019] The embodiments of the present invention will be fully described below, and some core features of the embodiments will be specifically shown in the accompanying drawings, wherein the same or similar reference numerals in the drawings represent the same or similar technical features, or structures or steps or processes with similar functions. Other embodiments replaced by ordinary technicians based on these embodiments without the need for creative work also belong to the protection scope of the present invention.

[0020] See also Figure 1 As shown, the structure of the engine starting device in this embodiment mainly includes a starting motor for transmission connection with the output end of the engine crankshaft. The key is that a driving gear is installed on the main shaft of the starting motor, and the driving gear is meshed and connected with a gear plate 2, and the two are reduced in speed. The gear plate 2 is rotatably sleeved on a centering shaft 3, and the end of the centering shaft 3 is detachably connected to the output end of the crankshaft of the engine. During specific installation, the end of the centering shaft 3 has a spline structure, and the spline structure is transmission-connected to the end of the crankshaft output end, and then when the centering shaft 3 rotates, it directly drives the crankshaft of the engine to rotate. At the same time, a very special structure is that a transmission disc 4 for connecting the gear disc 2 is also fixed on the centering shaft 3. The connection between the centering shaft 3 and the gear disc 2 is not a coaxial sleeve installation structure. In fact, the transmission disc 4 and the gear disc 2 are axially elastically connected together, that is, they are connected together through an elastic connector, so that when the gear disc 2 drives the centering shaft 3 to rotate and starts to rotate with the crankshaft, once the engine is started, the crankshaft will naturally rotate continuously under the push of the piston inside the engine. When the crankshaft speed increases to a speed higher than the speed of the gear disc 2 driven by the starter motor, the transmission disc 4 and the gear disc 2 will naturally rotate relative to each other, thereby slipping and disengaging the integrated transmission connection at the beginning. In the above operation, the starter motor can be set to automatically stop after a certain period of time, or stop in time according to the above speed difference. However, no matter when it stops, when the crankshaft gradually increases its speed, it will not force the gear disc 2 and the starter motor to rotate together, so as to avoid damage to the corresponding components or equipment.

[0021] As one of the specific implementation structures, such as Figure 1 The starter motor is mounted on one side of the end face of a mounting bracket 16, and the mounting bracket 16 is detachably mounted on the crankshaft output end of the engine, which is convenient for overall disassembly and assembly, and the centering shaft 3 is rotatably mounted on the bracket. During manufacture, the bracket has a plurality of connecting ear plates 401, each of which has a screw hole, and the bracket is detachably mounted on the end face of the output end of the engine, that is, in the connecting screw hole corresponding to the output end of the engine, by passing a bolt through the screw hole.

[0022] For the installation structure of the transmission plate 4, please refer to Figure 3-4 , there is a cylindrical blind hole in the end face of the transmission plate 4 facing the gear plate 2, a pressure spring 7 is coaxially installed in the cylindrical blind hole, a permanent magnet 8 is installed in the hole wall of the cylindrical blind hole, the transmission plate 4 and the gear plate 2 are connected axially by a plurality of sliding bolts 5 in an annular array, and due to the axial tensioning effect of these sliding bolts 5, the pressure spring 7 can be always in a compressed state, so that the transmission plate 4, the pressure spring 7, the sliding bolts 5, the gear plate 2, the centering shaft 3 and the like maintain an integral structure under normal conditions. In addition, an annular groove 90201 is provided in the end face of the gear plate 2, and the nuts 6 of all the sliding bolts 5 are smoothly contacted in the annular groove 90201, and when the crankshaft speed is higher than the speed of the gear plate 2 driven by the starter motor, the nuts 6 can slide circumferentially in the annular groove 90201, and existing structures such as T-slots can be used so that the nuts 6 can always be separated from the annular groove 90201. In addition, continue to refer to Figure 4 A closed conductive frame 9 connected end to end is also provided in the cylindrical blind hole. The conductive frame 9 is fixed on the end face of the gear plate 2 and rotates at the same speed as the gear plate 2. The centering shaft 3 and the transmission plate 4 are connected together by a locking tongue 17 installed elastically and telescopically. An electromagnet 20 that controls the locking tongue 17 to retract into the centering shaft 3 is connected in series to the conductive frame 9 to form a closed circuit with the electromagnet 20. In use, when the conductive frame 9 rotates relative to the transmission plate 4 along with the gear plate 2, the conductive frame 9 cuts the magnetic flux lines of the permanent magnet 8 to generate an induced current, so that the electromagnet 20 is energized to generate an attraction to the locking tongue 17, and the locking tongue 17 is completely sucked into the centering shaft 3, breaking away from the transmission connection relationship between the two. This is convenient for the engine to be started successfully. When the crankshaft rotates at high speed, it will not rotate with the transmission plate 4, the gear plate 2 and the starter motor at high speed.

[0023] As a more specific structure, such as Figure 4As shown, the centering shaft 3 has a groove 18 in the radial direction, and a push spring 19 is installed in the groove 18. The bottom end of the push spring 19 is connected to a positioning step in the groove 18, and the other end is connected to a lock tongue 17 that extends out of the centering shaft 3 in the normal state, such as when not working, to maintain the initial connection relationship with the transmission disk 4. In addition, an electromagnet 20 is embedded in the bottom of the groove 18, and the electromagnet 20 is pressed by a locking nut 21 threadedly installed in the groove 18, so as to be fixedly installed. In addition, a limiting column 22 for contacting the lock tongue 17 is fixed at the top of the locking nut 21. When the lock tongue 17 is sucked into the centering shaft 3, the push spring 19 will not be crushed. At the same time, this limiting column 22 can be processed into a hexagonal shape to adapt to the rotation of the locking nut 21 with a hexagonal wrench. In the above embodiment, for the installation of the permanent magnet 8, the ability to generate induced current is taken as the basis, and the adaptive design can be made with reference to the relevant technical field. As the present embodiment, the permanent magnets 8 are arranged in a circular array in the wall of the cylindrical blind hole to generate a larger and more timely current, and when installed, the polarities of the opposite ends can be opposite to each other. As for the energization of the electromagnet 20, it can be adaptively designed based on the electromagnetic induction current of the present invention and connected to the electromagnet 20.

[0024] Based on the above embodiment structure, Figure 3-4 The conductive frame 9 of this embodiment includes a pair of Π-shaped raised segments 901, and the two ends of the two raised segments 901 are respectively connected to a corresponding conductive ring, and the centering shaft 3 axially passes through the interior of the two conductive rings without contact, so as to avoid the induced electricity from being transmitted to the centering shaft 3. The first conductive ring 903 is fixed in the gear plate 2, and the second conductive ring 902 is freely located in the cylindrical blind hole without contacting other components, so as to form a closed circuit well.

[0025] In order to avoid the induction current, Figure 4 An insulating cup cover 10 can be embedded and fixed in the end surface of the gear plate 2. The bottom of the insulating cup cover 10 has an annular mounting groove. The annular mounting groove can be formed by a protruding ring 11 at the bottom of the insulating cup cover 10. The first conductive ring 903 is coaxially installed in the annular mounting groove, and its end is axially pressed and fixed by a locking ring 12 threadedly installed in the insulating cup cover 10 to achieve detachable installation.

[0026] As another implementation structure, two second conductive rings 902 are specially provided in this embodiment, and are respectively fixed to the ends on the same side of the two raised sections 901. The two second conductive rings 902 are coaxially arranged and spaced apart from each other. The inner walls of the two second conductive rings 902 have an annular guide groove. Each annular guide groove slides with a corresponding conductive column 13 inside it, and is in continuous contact and conduction. The conductive column 13 is fixed in an insulating base 14 embedded in the centering shaft 3. The two conductive columns 13 are respectively connected to the two ends of the electromagnet 20 through corresponding insulating wires 15. This is equivalent to connecting the electromagnet 20 to this closed circuit and avoiding the outflow of induced electricity. In addition, in order to ensure that the electromagnet 20 still has magnetism to maintain the state where the lock tongue 17 is retracted into the centering shaft 3 after the centering shaft 3 and the transmission disk 4 are disconnected from the transmission connection, similarly, if Figure 4 , a conductive frame 23 similar to the conductive frame 9 can also be set on the surface of the centering shaft 3 to connect with the corresponding wire 15 of the electromagnet. When necessary, a corresponding control switch can be adaptively set on the wire 15 as needed. The above-mentioned conductive frame 23 is fixed on the centering shaft 23 through an insulating ring 24 coaxially fixed on the centering shaft 3, and then insulated from the centering shaft 3, so that when the centering shaft 23 rotates, it can have relative movement with the permanent magnet 8 in the transmission disk 4, and then cut the magnetic flux lines to generate current. In this way, when the transmission disk 4 and the gear disk 2 do not rotate relative to each other, the magnetism of the electromagnet after power is maintained. When the engine test is completed, the electromagnet is powered off, and the centering shaft 3 is rotated manually or some structures are adaptively designed to automatically rotate, so that the lock tongue 17 can be rebounded into the inner wall of the transmission disk 4 during the rotation process to restore the transmission connection.

[0027] The above series of specific implementation details are merely some preferred embodiments of the present invention and cannot be used to limit the protection scope of the claims of the present invention. A person skilled in the art can simply change the design ideas based on the understanding of the above embodiments and the reference to the basic principles recorded in the claims of the present invention. However, these design changes still fall within the protection scope of the invention.

Claims

1. An engine starting device, comprising a starting motor for drivingly connecting to an output end of an engine crankshaft, characterized in that: A driving gear is mounted on the main shaft of the starter motor, the driving gear is meshed with a gear plate (2), the gear plate (2) is rotatably sleeved on a centering shaft (3), the end of the centering shaft (3) is detachably connected to the output end of the crankshaft, a transmission plate (4) for connecting the gear plate (2) is also fixed on the centering shaft (3), and the transmission plate (4) and the gear plate (2) are axially elastically connected together, when the centering shaft (3) is driven by the crankshaft and the rotation speed is higher than that of the gear plate (2) driven by the starter motor, the transmission plate (4) and the gear plate (2) rotate relative to each other and slip.

2. An engine starting device according to claim 1, characterized in that: The end of the centering shaft (3) has a spline structure, and the spline structure is drivingly connected to the end of the crankshaft output end.

3. An engine starting device according to claim 1, characterized in that: The starter motor is mounted on one side of an end surface of a mounting bracket (16); the mounting bracket (16) is detachably mounted on the crankshaft output end of the engine; the centering shaft (3) is rotatably mounted on the bracket; the bracket has a plurality of connecting ear plates (401), each connecting ear plate (401) has a screw hole, and the bracket is detachably mounted on the end surface of the output end of the engine by means of bolts passing through the screw holes.

4. An engine starting device according to claim 1, characterized in that: The transmission disc (4) has a cylindrical blind hole in its end surface facing the gear disc (2), a pressure spring (7) is coaxially mounted in the cylindrical blind hole, and a permanent magnet (8) is mounted in the hole wall of the cylindrical blind hole; the transmission disc (4) and the gear disc (2) are axially connected together by a plurality of sliding bolts (5) in an annular array, and the pressure spring (7) is always in a compressed state; An annular groove (90201) is provided in the end surface of the gear plate (2), and the nuts (6) of all the sliding bolts (5) are located in the annular groove (90201) in smooth contact, and when the crankshaft speed is higher than the speed of the gear plate (2) driven by the starter motor, the nuts (6) can slide in a circular motion in the annular groove (90201) and can always be separated from the annular groove (90201).

5. An engine starting device according to claim 4, characterized in that: A closed conductive frame (9) connected end to end is also provided in the cylindrical blind hole, and the conductive frame (9) is fixed on the end surface of the gear plate (2); the centering shaft (3) and the transmission plate (4) are connected together by a locking tongue (17) which is elastically telescopically installed; an electromagnet (20) which controls the locking tongue (17) to retract into the centering shaft (3) is connected in series to the conductive frame (9) to form a closed circuit with the electromagnet (20); when the conductive frame (9) rotates relative to the transmission plate (4) along with the gear plate (2), the conductive frame (9) cuts the magnetic flux lines of the permanent magnet (8) to generate an induced current, so that the electromagnet (20) is energized to generate an attractive force on the locking tongue (17).

6. An engine starting device according to claim 5, characterized in that: The centering shaft (3) has a groove (18) in the radial direction, and a push spring (19) is installed in the groove (18). The bottom end of the push spring (19) is connected to a positioning step in the groove (18), and the other end is connected to the locking tongue (17) that extends out of the centering shaft (3) in a normal state. The electromagnet (20) is embedded in the bottom of the groove (18), and the electromagnet (20) is pressed by a locking nut (21) threadedly installed in the groove (18). The top end of the locking nut (21) has a limiting column (22) for contacting the locking tongue (17).

7. An engine starting device according to claim 4, characterized in that: The permanent magnets (8) are arranged in a ring array in the hole wall of the cylindrical blind hole, and the polarities of the ends facing each other are opposite.

8. An engine starting device according to claim 5, characterized in that: The conductive frame (9) comprises a pair of Π-shaped raised sections (901), each of the two raised sections (901) being connected to a corresponding conductive ring at both ends, the centering shaft (3) passing axially through the interior of the two conductive rings without contact, the first conductive ring (903) being fixed in the gear plate (2), and the second conductive ring (902) being freely located in the cylindrical blind hole without contacting other components.

9. An engine starting device according to claim 8, characterized in that: An insulating cup cover (10) is embedded and fixed in the end surface of the gear plate (2), and the bottom of the insulating cup cover (10) has an annular mounting groove. The first conductive ring (903) is coaxially mounted in the annular mounting groove, and its end is axially pressed and fixed by a locking ring (12) threadedly mounted in the insulating cup cover (10).

10. An engine starting device according to claim 8, characterized in that: Two second conductive rings (902) are provided, which are respectively fixed to the ends on the same side of the two raised sections (901), and the two second conductive rings (902) are coaxially arranged with spacing, and the inner walls of the two second conductive rings (902) have an annular guide groove, and each annular guide groove is slidably matched with a corresponding conductive column (13) inside, and the conductive column (13) is fixed in an insulating base (14) embedded in the centering shaft (3), and the two conductive columns (13) are respectively connected to the two ends of the electromagnet (20) through corresponding insulating wires (15).

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