Engine turning gear and turning method thereof

Abstract

The invention relates to the technical field of engines, and particularly discloses an engine turning gear and a turning method.The engine turning gear comprises a mounting flange, a transmission shaft, a gear, a first sleeve, a first elastic piece and a locking piece, and the mounting flange is used for being fixed to a rack of an engine; a boss is arranged at the first end of the transmission shaft, a gear is mounted at the second end, and the transmission shaft can slide relative to the mounting flange and has a separation position separated from a flywheel gear ring of an engine and a turning position meshed with the flywheel gear ring; the first sleeve sleeves the transmission shaft in a clearance manner, the first sleeve is provided with a positioning structure, and the positioning structure comprises a plurality of positioning holes which are sequentially formed in the axial direction of the transmission shaft at intervals and sequentially formed in the circumferential direction of the first sleeve at intervals; the first elastic piece enables the first sleeve to abut against the boss; the locking piece is arranged on the mounting flange in a sliding mode, when the transmission shaft is located at the turning position corresponding to the engine model, the locking piece can be connected with the positioning hole corresponding to the engine model in an inserted mode, and high applicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an engine cranking device and a cranking method thereof. Background Art

[0002] The engine cranking device is mainly composed of three parts: a drive shaft, a first elastic member and a gear. When cranking, the cranking device must first be fixed to the engine bracket with bolts, and the gear on the drive shaft is moved. When the gear and the engine flywheel ring gear begin to engage, the first elastic member will be squeezed and the drive shaft will be limited by the limit member. Then a certain torque is applied to one end of the drive shaft to drive the gear of the drive shaft and the engine flywheel ring gear to rotate.

[0003] However, in the existing engine cranking tools, when the limiting member limits the transmission shaft, the degree of engagement between the gear and the engine flywheel ring gear is fixed. For different models of engines, the degree of engagement between the gear and the engine flywheel ring gear is different. As a result, the existing engine cranking tools can only adapt to specific models of engines and have a limited scope of application. Summary of the Invention

[0004] The purpose of the present invention is to provide an engine cranking device to meet the cranking requirements of engines of different models.

[0005] In one aspect, the present invention provides an engine cranking device, the engine cranking device comprising:

[0006] A mounting flange for fixing to the engine frame;

[0007] A transmission shaft is slidably disposed on the mounting flange, a boss being provided on a first end of the transmission shaft, and the transmission shaft can slide relative to the mounting flange to have a separation position and a turning position;

[0008] a gear mounted on the second end of the transmission shaft, wherein when the transmission shaft is in the cranking position, the gear is capable of meshing with the flywheel ring gear of the engine, and when the transmission shaft is in the disengaged position, the gear is disengaged from the flywheel ring gear;

[0009] a first sleeve, which is loosely sleeved on the transmission shaft and located between the mounting flange and the boss; the first sleeve is provided with a positioning structure, the positioning structure comprising a plurality of positioning holes sequentially spaced along the axial direction of the transmission shaft, and the plurality of positioning holes are sequentially spaced along the circumferential direction of the first sleeve;

[0010] a first elastic member configured to always have a movement tendency to make the first sleeve press against the boss;

[0011] A locking piece is slidably disposed on the mounting flange. When the transmission shaft is located at the turning position, the locking piece can be plugged into one of the plurality of positioning holes.

[0012] As a preferred technical solution of the engine cranking device, the engine cranking device further includes a limit switch, the limit switch including a switch body, a detection rod slidably connected to the switch body, and a second elastic member, the detection rod being able to slide relative to the switch body to have an extended position and a retracted position, and the second elastic member being configured to always have a tendency to drive the detection rod to move toward the extended position;

[0013] When the detection rod is located in the extended position and the transmission shaft is located in the separated position, the detection rod is separated from the first sleeve and is located on the movement path of the first sleeve, and the limit switch sends a first detection signal; when the detection rod is located in the extended position and the transmission shaft moves to the turning position, the first sleeve can contact the detection rod and drive the detection rod to move from the extended position to the retracted position; when the detection rod is located in the retracted position, the limit switch sends a second detection signal.

[0014] As a preferred technical solution of the engine cranking device, the outer circumferential surface of the first sleeve is conical, and the outer diameter of the first sleeve gradually decreases from the first end of the transmission shaft to the second end of the transmission shaft.

[0015] As a preferred technical solution of the engine cranking device, a roller is rotatably provided on one end of the detection rod away from the switch body.

[0016] As a preferred technical solution of the engine cranking device, when the transmission shaft is located at the disengaged position, the distance between the gear and the flywheel ring gear is equal to the distance between the first sleeve and the detection rod.

[0017] As an optimal technical solution for the engine cranking device, the engine cranking device also includes a second sleeve, which is fixed to the mounting flange, and the second sleeve and the first sleeve are respectively located on both sides of the mounting flange, and the transmission shaft is gap-through in the second sleeve. When the transmission shaft is in the separation position, the gear abuts against the second sleeve.

[0018] As an optimal technical solution for the engine cranking device, the first elastic member is a compression spring, one end of the compression spring abuts against the sleeve, and the other end of the compression spring abuts against the mounting flange. The mounting flange is provided with a spring seat, and the spring seat is sleeved on the transmission shaft. The spring seat is provided with a groove, and one end of the compression spring extends into the groove.

[0019] As an optimal technical solution for the engine cranking device, the engine cranking device includes a plurality of the locking members, which are evenly distributed along the circumference of the transmission shaft; the first sleeve is provided with a plurality of the positioning structures, which are evenly distributed along the circumference of the first sleeve; and the plurality of the locking members are arranged in one-to-one correspondence with the plurality of the positioning structures.

[0020] The engine cranking device provided by the present invention has at least the following beneficial effects:

[0021] The engine cranking device includes a mounting flange, a transmission shaft, a gear, a first sleeve, a first elastic member and a locking member, the mounting flange is used to be fixed to the frame of the engine; the transmission shaft can be slidably passed through the mounting flange, and a boss is provided at the first end of the transmission shaft, and the transmission shaft can slide relative to the mounting flange and has a separation position and a cranking position; the gear is mounted on the second end of the transmission shaft, and when the transmission shaft is in the cranking position, the gear can mesh with the flywheel ring gear of the engine, and when the transmission shaft is in the separation position, the gear is separated from the flywheel ring gear; the first sleeve is loosely sleeved on the transmission shaft and is located between the mounting flange and the boss, the first sleeve is provided with a positioning structure, the positioning structure includes a plurality of positioning holes arranged in sequence along the axial direction of the transmission shaft, and the plurality of positioning holes are arranged in sequence along the circumferential direction of the first sleeve; the first The elastic member is configured to always have a movement tendency to make the first sleeve press against the boss; the locking member is slidably arranged on the mounting flange, and when the transmission shaft is in the cranking position, the locking member can be plugged into one of the multiple positioning holes. The engine cranking device can determine the size of the gear that needs to engage with the flywheel ring gear during cranking according to the actual model of the engine, and then determine the position of the transmission shaft when it is in the cranking position, and the positioning hole corresponding to the actual model of the engine. When the engine needs to be cranked, the transmission shaft is moved to the corresponding cranking position, and then the locking member is inserted into the corresponding positioning hole to lock the position of the first sleeve, thereby fixing the position of the transmission shaft and the gear relative to the flywheel ring gear, and then the transmission shaft is driven to rotate by a torque tool to perform the cranking operation, which has high applicability.

[0022] In another aspect, the present invention provides a cranking method for an engine cranking device, which is implemented by the engine cranking device described in any of the above solutions. The cranking method for the engine cranking device comprises:

[0023] Get the engine model;

[0024] determining a meshing coefficient of the gear meshing into the flywheel ring gear of the engine based on the model of the engine;

[0025] Determine a target positioning hole based on the meshing coefficient, where the target positioning hole is one of the plurality of positioning holes;

[0026] The driving transmission shaft drives the gear and the flywheel ring gear to gradually mesh and stop when the target positioning hole and the locking member are at the same height along the axial direction of the transmission shaft;

[0027] The locking piece is plugged into the target positioning hole.

[0028] As a preferred technical solution of the cranking method of the engine cranking device, the cranking method of the cranking device further includes the following steps that are synchronously executed: the driving transmission shaft drives the gear and the flywheel ring gear to gradually mesh and stop when the target positioning hole is opposite to the locking member:

[0029] The position of the gear is detected in real time, and when the gear is engaged with the flywheel ring gear, starting the engine is prohibited.

[0030] The cranking method of an engine cranking device provided by the present invention has at least the following beneficial effects:

[0031] The cranking method of the engine cranking device obtains the model of the engine, determines the meshing coefficient of the gear meshing into the flywheel ring gear of the engine based on the engine model, and determines the target positioning hole based on the meshing coefficient. The target positioning hole is one of multiple positioning holes. The driving transmission shaft drives the gear to gradually mesh with the flywheel ring gear and stops until the target positioning hole and the locking member are at the same height along the axial direction of the transmission shaft. The locking member is plugged into the target positioning hole, so that the position where the transmission shaft drives the gear to stop corresponds to the model of the engine, and after the locking member locks the position of the first sleeve, the position of the transmission shaft can be guaranteed to be stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the first structure of the engine cranking device and the flywheel ring gear in an embodiment of the present invention;

[0033] Figure 2 A second structural schematic diagram of the engine cranking device and the flywheel ring gear in an embodiment of the present invention;

[0034] Figure 3 is a first cross-sectional view of an engine cranking device according to an embodiment of the present invention;

[0035] Figure 4 is a second cross-sectional view of the engine cranking device according to an embodiment of the present invention;

[0036] Figure 5 1 is a schematic diagram of the first structure of the engine cranking device according to an embodiment of the present invention;

[0037] Figure 6 This is a second structural schematic diagram of the engine cranking device in an embodiment of the present invention;

[0038] Figure 7Flowchart of a cranking method of an engine cranking device according to an embodiment of the present invention;

[0039] Figure 8 2 is a third structural schematic diagram of the engine cranking device in an embodiment of the present invention.

[0040] In the picture:

[0041] 1. Install the flange;

[0042] 2. Drive shaft; 21. Boss;

[0043] 3. Gear;

[0044] 4. First sleeve; 41. Positioning hole;

[0045] 5. First elastic member; 6. Locking member; 7. Bolt;

[0046] 8. Limit switch; 81. Switch body; 82. Detection rod; 83. Roller;

[0047] 9. Second sleeve; 10. Support block; 11. Spring seat; 12. Flywheel ring gear; 13. Starting device. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0051] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0052] Please refer to Figures 1 to 6 This embodiment provides an engine cranking device, which includes a mounting flange 1, a transmission shaft 2, a gear 3, a first sleeve 4, a first elastic member 5 and a locking member 6. Among them, the mounting flange 1 is used to be fixed to the engine frame; the transmission shaft 2 is slidably inserted into the mounting flange 1, and a boss 21 is provided at the first end of the transmission shaft 2. The transmission shaft 2 can slide relative to the mounting flange 1 and has a separation position and a cranking position; the gear 3 is mounted on the second end of the transmission shaft 2. When the transmission shaft 2 is in the cranking position, the gear 3 can engage with the flywheel ring gear 12 of the engine, and when the transmission shaft 2 is in the separation position, the gear 3 is separated from the flywheel ring gear 12; the first sleeve 4 is loosely sleeved on the transmission shaft 2 and is located between the mounting flange 1 and the boss 21. The first sleeve 4 is provided with a positioning structure, which includes a plurality of positioning holes 41 arranged in sequence along the axial direction of the transmission shaft 2, and the plurality of positioning holes 41 are arranged in sequence along the circumferential direction of the first sleeve 4; the first elastic member 5 is configured to always have a movement tendency to make the first sleeve 4 press against the boss 21; the locking member 6 is slidably provided on the mounting flange 1. When the transmission shaft 2 is in the cranking position, the locking member 6 can be selectively plugged into one of the plurality of positioning holes 41.

[0053] The engine cranking device provided in this embodiment can determine the size of the flywheel ring gear 12 that the gear 3 needs to engage during cranking according to the actual model of the engine, and then determine the position of the drive shaft 2 when it is in the cranking position, as well as the positioning hole 41 corresponding to the actual model of the engine. When the engine needs to be cranked, the drive shaft 2 is moved to the corresponding cranking position, and then the locking member 6 is inserted into the corresponding positioning hole 41 to lock the position of the first sleeve 4, thereby fixing the position of the drive shaft 2 and the gear 3 relative to the flywheel ring gear 12, and then the drive shaft 2 is driven to rotate by a torque tool to perform the cranking operation, which has high applicability.

[0054] In this embodiment, when the locking member 6 is separated from the positioning hole 41, the elastic force of the first elastic member 5 allows the first sleeve 4 to remain in contact with the boss 21 of the drive shaft 2. When a cranking operation is required, an external driving force is applied to move the drive shaft 2 from the separated position to the cranking position. During this process, the drive shaft 2 drives the first sleeve 4 to move synchronously via the boss 21, causing the first elastic member 5 to be compressed. When the locking member 6 is inserted into one of the positioning holes 41, the relative position of the first sleeve 4 and the mounting flange 1 is locked. The external driving force is no less than the elastic force of the first elastic member 5.

[0055] Furthermore, after the locking member 6 is plugged into the positioning hole 41, the external driving force causes the transmission shaft 2 to cling to the first sleeve 4, thereby maintaining a stable relative position between the transmission shaft 2 and the fixing flange. This, in turn, stabilizes the position of the transmission shaft 2 and the gear 3 relative to the flywheel ring gear 12, thus stabilizing the position of the transmission shaft 2 and ensuring a stable turning operation. It should be noted that after the locking member 6 is plugged into the positioning hole 41, the external driving force can be appropriately reduced, as long as the boss 21 of the transmission shaft 2 can be in contact with the first sleeve 4.

[0056] Furthermore, when the turning operation is completed, it is only necessary to separate the locking member 6 from the positioning hole 41. Under the elastic force of the first elastic member 5, the first sleeve 4 drives the transmission shaft 2 to move to the separation position, so that the gear 3 is separated from the flywheel ring gear 12.

[0057] Furthermore, the cranking position of the drive shaft 2 is not fixed; it can be set based on the engine model being cranked. Specifically, the required engagement size of the gear 3 into the flywheel ring gear 12 may vary for different engine models, leading to differences in the cranking position of the drive shaft 2. Of course, it's possible that the gear 3 may need to engage the same size of the flywheel ring gear 12 for two different engine models.

[0058] Furthermore, in this embodiment, the axial arrangement positions of the plurality of positioning holes 41 along the transmission shaft 2 can be related to the models of the various engines that the engine cranking device needs to match. That is, the axial arrangement positions of the plurality of positioning holes 41 along the transmission shaft 2 correspond one-to-one to the multiple engine models. Therefore, when the transmission shaft 2 is located at a cranking position that matches the model of the engine that needs to be cranked, the locking member 6 can be plugged into and fitted with the positioning hole 41 that matches the model of the engine that needs to be cranked. In other embodiments, the plurality of positioning holes 41 are arranged at equal intervals along the axial direction of the transmission shaft 2, and the spacing is relatively small. When the transmission shaft 2 is located at a cranking position that matches the model of the engine that needs to be cranked, if the locking member 6 is not aligned with each positioning hole 41 in the axial direction of the transmission shaft 2, the transmission shaft 2 is appropriately moved so that the locking member 6 is aligned with the nearest positioning hole 41 and plugged into and fitted with it.

[0059] In this embodiment, multiple positioning holes 41 are spaced apart along the circumference of the first sleeve 4 so that two adjacent positioning holes 41 can maintain partial offset along the axial direction of the transmission shaft 2. When the transmission shaft 2 moves to a cranking position suitable for the model of the engine to be cranked, the first sleeve 4 is rotated to align the locking member 6 with the corresponding positioning hole 41. Then, the locking member 6 is driven to move relative to the mounting flange 1, so that the locking member 6 can be plugged into and engaged with the positioning hole 41. Preferably, the locking member 6 is a pin, and the end of the locking member 6 is chamfered to facilitate smooth insertion of the locking member 6 into the positioning hole 41.

[0060] In this embodiment, the mounting flange 1 is fixed to the engine frame by a plurality of bolts 7. Preferably, the plurality of bolts 7 are evenly distributed along the circumference of the mounting flange 1, and each bolt 7 passes through the mounting flange 1 and is threadedly connected to the engine frame.

[0061] Optionally, a support block 10 is provided on the mounting flange 1 , and the locking member 6 is slidably provided on the support block 10 , and the sliding direction of the locking member 6 is perpendicular to the center line of the first sleeve 4 .

[0062] Optionally, the first elastic member 5 is a compression spring, one end of which abuts against the sleeve, and the other end of which abuts against the mounting flange 1. In other embodiments, the first elastic member 5 may also be replaced by a disc spring, a tension spring, or the like.

[0063] Optionally, the mounting flange 1 is provided with a spring seat 11, which is sleeved on the transmission shaft 2. The spring seat 11 is provided with a groove, and one end of the compression spring extends into the groove. In this arrangement, the spring seat 11 ensures that the deformation direction of the compression spring remains stable when the compression spring undergoes elastic deformation.

[0064] Optionally, the multiple positioning holes 41 of the positioning structure are all opposite to the spring seat 11 to prevent the locking member 6 from extending into the first elastic member 5, thereby avoiding jamming.

[0065] Optionally, the engine cranking device includes multiple locking members 6, which are evenly distributed along the circumference of the transmission shaft 2. The first sleeve 4 is provided with multiple positioning structures, which are evenly distributed along the circumference of the first sleeve 4. The multiple locking members 6 are arranged in a one-to-one correspondence with the multiple positioning structures. In this arrangement, the multiple locking members 6 cooperate with the positioning holes 41 in the multiple positioning structures to ensure stable force on the first sleeve 4, thereby ensuring a stable relative position between the first sleeve 4 and the mounting flange 1. This embodiment exemplifies a solution in which the engine cranking device includes two locking members 6, the first sleeve 4 is provided with two positioning structures, and the two locking members 6 correspond to the two positioning structures, respectively.

[0066] Optionally, the engine cranking device further includes a limit switch 8, which includes a switch body 81, a detection rod 82 slidably connected to the switch body 81, and a second elastic member (not shown in the drawings). The detection rod 82 can slide relative to the switch body 81 and has an extended position and a retracted position. The second elastic member is configured to always have a tendency to drive the detection rod 82 to move toward the extended position. When the detection rod 82 is in the extended position and the transmission shaft 2 is in the separated position, the detection rod 82 is separated from the first sleeve 4 and is located on the movement path of the first sleeve 4, and the limit switch 8 emits a first detection signal. When the detection rod 82 is in the extended position and the transmission shaft 2 moves to the cranking position, the first sleeve 4 can contact the detection rod 82 and drive the detection rod 82 to move from the extended position to the retracted position. When the detection rod 82 is in the retracted position, the limit switch 8 emits a second detection signal. With this arrangement, the position of the transmission shaft 2 can be detected by the limit switch 8, ensuring that the engine is prevented from being accidentally started during cranking. Specifically, the controller collects signals from the limit switch 8 and controls the engine based on the signals from the limit switch 8. When the controller receives the first detection signal, if it receives an engine start instruction, it allows the engine to start. When the controller receives the second detection signal, if it receives an engine start instruction, it prohibits the engine from starting. In this case, even if someone in the cab attempts to start the engine, the engine cannot start, thereby protecting the operator performing the cranking operation and preventing damage to the engine cranking device.

[0067] The switch body 81 can be a photoelectric switch, a Hall sensor, etc., and is electrically connected to the controller. Taking a photoelectric switch as an example, the switch body 81 includes a light emitting end and a light receiving end that are spaced apart and arranged opposite to each other. When the detection rod 82 is in the extended position, the detection rod 82 is separated from the light emitting end and the light receiving end, and the light receiving end can receive the light emitted by the light emitting end, so that the switch body 81 emits a first detection signal (such as a high level). When the detection rod 82 is in the retracted position, the detection rod 82 extends between the light emitting end and the light receiving end. Under the shielding of the detection rod 82, the light receiving end cannot receive the light emitted by the light emitting end, so that the limit switch 8 emits a second detection signal (such as a low level).

[0068] Optionally, when the transmission shaft 2 is in the disengaged position, along the axial direction of the transmission shaft 2, the distance between the gear 3 and the flywheel ring gear 12 is equal to the distance between the first sleeve 4 and the detection rod 82. With this arrangement, when the gear 3 is in a critical state of engagement and disengagement with the flywheel ring gear 12, the first sleeve 4 and the detection rod 82 are in a critical state of contact and separation, that is, when the gear 3 is just engaged with the flywheel ring gear 12, the first sleeve 4 and the detection rod 82 are also just in contact, and the detection rod 82 is moved to the retracted position, and the limit switch 8 sends a second detection signal, thereby ensuring the accuracy of the limit switch 8 in detecting the position of the gear 3.

[0069] It can be understood that, in this embodiment, when the detection rod 82 is located at the retracted position, the detection rod 82 is not located at a fixed point, but is located within a range.

[0070] Optionally, the outer circumference of the first sleeve 4 is conical, and the outer diameter of the first sleeve 4 gradually decreases from the first end of the transmission shaft 2 to the second end of the transmission shaft 2. With this arrangement, after the first sleeve 4 contacts the detection rod 82, as the transmission shaft 2 gradually moves toward the cranking position, the detection rod 82 gradually retracts, and the size of the gear 3 engaging with the flywheel ring gear 12 is positively correlated with the size of the detection rod 82 retracted. The specific relationship is as follows:

[0071] △L2=△L1*K1+a.

[0072] Among them, △L2 is the size of the retracted detection rod 82; △L1 is the size of the gear 3 meshing with the flywheel ring gear 12, as shown in FIG. Figure 6 As shown, ΔL1 is the distance the first sleeve 4 moves further axially along the transmission shaft 2 after contact with the detection rod 82. a is a constant, and K1 is a proportional coefficient, which is specifically related to the cone angle of the first sleeve 4. When the transmission rod moves toward the cranking position, the distance the detection rod 82 moves is detected, and the distance the gear 3 engages with the flywheel ring gear 12 can be detected. This allows the transmission rod to be controlled to stop at the appropriate position to match the model of the engine requiring cranking.

[0073] Alternatively, see Figure 5 and Figure 6 The outer surface of the detection rod 82 is provided with a scale, and the mounting flange 1 is provided with a pointer. The pointer and the scale cooperate to read the initial scale mark L2 on the scale corresponding to the pointer when the transmission shaft 2 is in the separation position. Then, when the transmission shaft 2 moves toward the turning position, the real-time scale mark L2' on the scale corresponding to the pointer is read in real time, where ΔL2 = L2 - L2'. In other embodiments, a position sensor may also be provided on the detection rod 82 to detect the real-time position of the detection rod 82 via the position sensor.

[0074] Optionally, a roller 83 is rotatably provided at one end of the detection rod 82 away from the switch body 81. By providing the roller 83, it is possible to avoid a jam between the detection rod 82 and the first sleeve 4.

[0075] Optionally, the engine cranking device further includes a second sleeve 9, which is fixed to the mounting flange 1. The second sleeve 9 and the first sleeve 4 are respectively located on either side of the mounting flange 1. The transmission shaft 2 is loosely inserted through the second sleeve 9. When the transmission shaft 2 is in the disengaged position, the gear 3 abuts the second sleeve 9. This arrangement ensures that the position of the gear 3 remains stable when the transmission shaft 2 is in the disengaged position.

[0076] Please refer to Figure 7 and Figure 8 This embodiment further provides a cranking method for an engine cranking device, which is implemented by the above-mentioned engine cranking device. The cranking method for the engine cranking device includes the following steps.

[0077] S100: Get the engine model.

[0078] The engine model is obtained based on the engine's factory information.

[0079] S200: Determine the meshing coefficient of the gear 3 meshing with the flywheel ring gear 12 of the engine based on the engine model.

[0080] Specifically, the controller pre-stores a first mapping relationship between the engine model and the meshing coefficient of the gear 3 meshing with the engine's flywheel ring gear 12. The meshing coefficient of the gear 3 meshing with the engine's flywheel ring gear 12 is determined based on the acquired engine model and the first mapping relationship. The first mapping relationship between the engine model and the meshing coefficient of the gear 3 meshing with the engine's flywheel ring gear 12 can be determined through preliminary bench testing.

[0081] Among them, the meshing coefficient is K2, and the maximum size of the gear 3 meshing with the engine's flywheel ring gear 12 is D. For a specific model of engine, the required size of the gear 3 meshing with the engine's flywheel ring gear 12 is K2*D, that is, for a specific model of engine, when the drive shaft 2 is in the cranking position, the size △L1 of the gear 3 meshing with the engine's flywheel ring gear 12 is = K2*D.

[0082] In other embodiments, the meshing coefficient of the gear 3 meshing with the flywheel ring gear 12 of the engine may also be determined according to the cranking working condition of the engine. The meshing coefficient may be different under different cranking working conditions.

[0083] S300 : determining a target positioning hole based on the meshing coefficient, where the target positioning hole is one of the plurality of positioning holes 41 .

[0084] Specifically, the controller pre-stores a second mapping relationship between the meshing coefficient and the target positioning hole, and the target positioning hole can be determined based on the meshing coefficient and the second mapping relationship. The second mapping relationship between the meshing coefficient and the target positioning hole can be determined through a preliminary bench test.

[0085] Among them, since there is a positioning hole 41 corresponding to each engine model, for a specific engine model, when the transmission shaft 2 is in the cranking position, the target positioning hole and the locking member 6 are opposite to each other in the axial direction of the transmission shaft 2.

[0086] Optionally, each positioning hole 41 of the corresponding positioning structure on the first sleeve 4 is marked with an identifier, which may be the meshing coefficient corresponding to the positioning hole 41 , so that when the drive shaft 2 is driven to move toward the turning position, the stop position of the drive shaft 2 can be determined by referring to the identifier.

[0087] S400 : The driving shaft 2 drives the gear 3 to gradually mesh with the flywheel ring gear 12 until the target positioning hole and the locking member 6 are at the same height along the axial direction of the driving shaft 2 and stop.

[0088] Specifically, an external driving force is applied to push the transmission shaft 2 to move from the separation position to the turning position, and the transmission shaft 2 drives the first sleeve 4 to move synchronously through the boss 21 .

[0089] Optionally, before driving the transmission shaft 2 to move, the first sleeve 4 can be rotated to make the center lines of the target positioning hole and the locking member 6 parallel, so that when the transmission shaft 2 moves, it is easy to observe whether the target positioning hole and the locking member 6 are aligned. In other embodiments, the transmission shaft 2 can also be driven to move first, and it can be visually determined whether the target positioning hole and the locking member 6 are at the same height along the axial direction of the transmission shaft 2. When they are at the same height, the sleeve is rotated to make the center lines of the target positioning hole and the locking member 6 coincide with each other.

[0090] S500: The locking member 6 is plugged into the target positioning hole.

[0091] The locking member 6 is driven by external force to slide relative to the mounting flange 1 so that the locking member 6 is inserted into the target positioning hole.

[0092] Optionally, after step S500, a torque tool (such as a motor, etc.) is allowed to drive the transmission shaft 2 to rotate, so as to drive the engine to perform a cranking operation.

[0093] The winching method of the winching device provided in this embodiment obtains the model of the engine, determines the meshing coefficient of the gear 3 meshing with the flywheel ring gear 12 of the engine based on the engine model, and determines the target positioning hole based on the meshing coefficient. The target positioning hole is one of the multiple positioning holes 41. The driving transmission shaft 2 drives the gear 3 to gradually mesh with the flywheel ring gear 12 and stops until the target positioning hole and the locking member 6 are at the same height along the axial direction of the transmission shaft 2. The locking member 6 is plugged into the target positioning hole, so that the position where the transmission shaft 2 drives the gear 3 to stop corresponds to the model of the engine, and after the locking member 6 locks the position of the first sleeve 4, the position of the transmission shaft 2 can be guaranteed to be stable.

[0094] Optionally, the cranking method of the cranking device further includes the following steps executed synchronously with step S500:

[0095] S600: Detect the position of the gear 3 in real time. When the gear 3 is engaged with the flywheel ring gear 12, the engine is prohibited from starting.

[0096] Specifically, when △L1>0, it indicates that the gear 3 is engaged with the flywheel ring gear 12, that is, the displacement △L2 of the detection rod 82 is>0, and the detection rod 82 is in the retracted position. Therefore, the detection signal emitted by the limit switch 8 can be used to control the engine based on the signal emitted by the limit switch 8. Among them, when the controller receives the first detection signal, it indicates that the gear 3 is not yet engaged with the flywheel ring gear 12. If the controller receives an instruction to start the engine, such as the engine start button is pressed, or the engine key is inserted into the engine keyhole and the engine is started, the engine is allowed to start. When the engine is allowed to start, the controller controls the starting device 13 to drive the flywheel ring gear 12 to rotate, thereby starting the engine; when the controller receives the second detection signal, it indicates that the gear 3 is engaged with the flywheel ring gear 12. If the controller receives an instruction to start the engine, the engine is prohibited from starting, and a text or pattern message prohibiting the engine from starting is displayed on the instrument. When the engine is allowed to start, the controller controls the starting device 13 to stop working.

[0097] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An engine cranking device, characterized in that: include: A mounting flange (1) for fixing to a frame of an engine; A transmission shaft (2) is slidably disposed on the mounting flange (1), a boss (21) being provided at a first end of the transmission shaft (2), and the transmission shaft (2) can slide relative to the mounting flange (1) to have a separation position and a turning position; a gear (3) mounted on the second end of the transmission shaft (2), wherein when the transmission shaft (2) is located in the cranking position, the gear (3) is capable of meshing with the flywheel ring gear (12) of the engine, and when the transmission shaft (2) is located in the separation position, the gear (3) is separated from the flywheel ring gear (12); A first sleeve (4) is sleeved on the transmission shaft (2) with a gap and is located between the mounting flange (1) and the boss (21). The first sleeve (4) is provided with a positioning structure, and the positioning structure includes a plurality of positioning holes (41) arranged in sequence and at intervals along the axial direction of the transmission shaft (2), and the plurality of positioning holes (41) are arranged in sequence and at intervals along the circumferential direction of the first sleeve (4); A first elastic member (5) is configured to always have a movement tendency to make the first sleeve (4) press against the boss (21); A locking member (6) is slidably arranged on the mounting flange (1); when the transmission shaft (2) is located at the turning position, the locking member (6) can be plugged into one of the plurality of positioning holes (41).

2. The engine cranking device according to claim 1, characterized in that: The engine cranking device further comprises a limit switch (8), the limit switch (8) comprising a switch body (81), a detection rod (82) slidably connected to the switch body (81), and a second elastic member, the detection rod (82) being capable of sliding relative to the switch body (81) to have an extended position and a retracted position, and the second elastic member being configured to always have a tendency to drive the detection rod (82) to move toward the extended position; When the detection rod (82) is located at the extended position and the transmission shaft (2) is located at the separated position, the detection rod (82) is separated from the first sleeve (4), and the detection rod (82) is located on the movement path of the first sleeve (4), and the limit switch (8) sends a first detection signal; when the detection rod (82) is located at the extended position and the transmission shaft (2) moves to the turning position, the first sleeve (4) can contact the detection rod (82) and drive the detection rod (82) to move from the extended position to the retracted position; when the detection rod (82) is located at the retracted position, the limit switch (8) sends a second detection signal.

3. The engine cranking device according to claim 2, characterized in that: The outer peripheral surface of the first sleeve (4) is conical, and the outer diameter of the first sleeve (4) gradually decreases in the direction from the first end of the transmission shaft (2) to the second end of the transmission shaft (2).

4. The engine cranking device according to claim 3, characterized in that: A roller (83) is rotatably provided at one end of the detection rod (82) away from the switch body (81).

5. The engine cranking device according to claim 2, characterized in that: When the transmission shaft (2) is located at the separation position, the distance between the gear (3) and the flywheel ring gear (12) is equal to the distance between the first sleeve (4) and the detection rod (82).

6. The engine cranking device according to claim 1, characterized in that: The engine cranking device further comprises a second sleeve (9), the second sleeve (9) being fixed to the mounting flange (1), and the second sleeve (9) and the first sleeve (4) being respectively located on both sides of the mounting flange (1), the transmission shaft (2) being loosely provided through the second sleeve (9), and when the transmission shaft (2) is located in the separation position, the gear (3) abuts against the second sleeve (9).

7. The engine cranking device according to claim 1, characterized in that: The first elastic member (5) is a compression spring, one end of which abuts against the sleeve, and the other end of which abuts against the mounting flange (1). The mounting flange (1) is provided with a spring seat (11), which is sleeved on the transmission shaft (2). The spring seat (11) is provided with a groove, and one end of the compression spring extends into the groove.

8. The engine cranking device according to any one of claims 1 to 7, characterized in that: The engine cranking device comprises a plurality of locking members (6), the plurality of locking members (6) being evenly distributed along the circumference of the transmission shaft (2), the first sleeve (4) being provided with a plurality of positioning structures, the plurality of positioning structures being evenly distributed along the circumference of the first sleeve (4), and the plurality of locking members (6) being arranged in one-to-one correspondence with the plurality of positioning structures.

9. A cranking method for an engine cranking device, characterized in that: The engine cranking device according to any one of claims 1 to 8 is implemented, and the cranking method of the engine cranking device includes: Get the engine model; Determining the meshing coefficient of the gear (3) meshing with the flywheel ring gear (12) of the engine based on the model of the engine; Determining a target positioning hole based on the meshing coefficient, the target positioning hole being one of the plurality of positioning holes (41); The driving transmission shaft (2) drives the gear (3) and the flywheel ring gear (12) to gradually mesh and stop until the target positioning hole and the locking member (6) are at the same height along the axial direction of the transmission shaft (2); The locking piece (6) is plugged into the target positioning hole.

10. The engine cranking method according to claim 9, characterized in that: The cranking method of the cranking device also includes the following steps that are synchronously executed when the driving transmission shaft (2) gradually engages the driving gear (3) and the flywheel ring gear (12) and stops when the target positioning hole and the locking member (6) are opposite to each other: The position of the gear (3) is detected in real time, and when the gear (3) is engaged with the flywheel ring gear (12), starting the engine is prohibited.

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