Starting hand pulling disc and two-stroke engine

Abstract

The starting hand pulling disc and the two-stroke engine are connected, the inner wall of the outer cover and the outer wall of the pulling disc wheel are connected through a return spring, and the inner wall of the pulling disc wheel and the outer wall of the starting disc wheel are connected through an energy storage spring. A pull rope is also fixed on the outer wall of the pull disc wheel; the starting disc wheel is provided with a clamping jaw which is meshed with the starting flywheel; the pull rope is pulled to drive the pull disc wheel to rotate, and the energy storage spring coil shrinks to store energy until the torque is greater than the resistance torque for starting the flywheel; and then the plate pulling wheel is driven by the return spring to reset. The labor-saving lever is arranged between the energy storage spring for receiving torque through the starting disc wheel and the pull rope of the pull disc wheel relative to different torque of the rotating shaft, so that a user feels easy and labor-saving to pull and start by hand, meanwhile, the smoothness is improved, the requirements on the physical pulling force and the pulling skill of the user are greatly reduced, and the labor-saving effect is achieved. And the requirements of various users can be better met.

Description

Technical Field

[0001] The utility model relates to the field of fire fighting equipment, in particular to a starter hand pull disc and a two-stroke engine. Background Art

[0002] In the case of power shortage at the forest fire scene, it is necessary to rely on manpower to quickly start the engine to supply water and extinguish the fire as soon as possible. Taking backpack fire pumps as an example, the engines used have high unit output power requirements, high operating speeds (about 6500-8000rpm), and large working torque requirements. It is very common to rely on skilled strongmen to pull the rope to start the engine.

[0003] At present, the existing two-stroke engine starting hand pull disc relies on manpower to directly pull the rope turntable to drag the engine flywheel to rotate, and to meet the starting speed torque requirements. It requires high physical strength and skills of the operator, consumes a lot of physical strength, and is easy to cause damage to the starting disc and the phenomenon of the claws and the engine flywheel slipping, thus affecting the progress of rescuing people and property. The common hand pull discs on the market usually adopt a three-claw structure, and its starting is achieved by the spring pushing out the three claws to clamp the engine flywheel during the rotation process. When the equipment is running for a long time, this structure is easy to cause the claws to be unable to pop out when starting again due to the long-term pressure of the spring elastic force on the claws, and it is easy to cause the claws and the engine flywheel to slip during normal use. Summary of the invention

[0004] The utility model aims to solve the existing problems and provide a starter hand pull disc and a two-stroke engine. In order to achieve the above purpose, the technical solution adopted by the utility model includes an outer cover, a pull disc wheel coaxially arranged, a starter disc wheel, a return spring, and an energy storage spring;

[0005] The inner wall of the outer cover and the outer wall of the pull-disc wheel are connected via a return spring, and the inner wall of the pull-disc wheel and the outer wall of the start-disc wheel are connected via an energy storage spring; a pull rope is also fixed to the outer wall of the pull-disc wheel;

[0006] The starting disc wheel is provided with a claw, and the claw is engaged with the starting flywheel;

[0007] Pulling the pull rope drives the pull disc wheel to rotate, and the energy storage spring coil contracts and stores energy until the torque is greater than the resistance torque of the starting flywheel; after completion, the return spring drives the pull disc wheel to reset.

[0008] Furthermore, there are two claws, which can be extended / retracted along the direction of the curved guide rod respectively to achieve engagement / disengagement with the starting flywheel.

[0009] Furthermore, the lower end faces of the claws are respectively arranged in the sliding grooves of the upper end face of the starting wheel through the rotating shafts and can rotate optionally; the upper end faces of the two claws are provided with sliders; the middle part of the curved guide rod sleeve is fixed on the central axis, and it radially extends out of the guide rail.

[0010] Furthermore, the return spring and the energy storage spring are coil springs.

[0011] Furthermore, an annular groove is provided on the outer wall of the pull plate wheel, and the pull rope is fixed and wound in the annular groove.

[0012] Furthermore, the outer cover is provided with an opening for the draw cord to extend out.

[0013] Furthermore, a conical air inlet hole is provided on the outer cover.

[0014] The utility model also provides a two-stroke engine, comprising any one of the above-mentioned starter hand pull discs.

[0015] Compared with the prior art, the utility model sets a labor-saving lever with different force arms relative to the rotating shaft between the energy storage spring of the starting disc wheel receiving torque and the pull rope of the pull disc wheel, which makes the user feel easy and labor-saving when starting by hand, and at the same time improves the smoothness, greatly reduces the requirements on the user's physical strength and pulling skills, and can better meet the needs of various users. The radially extendable claws are engaged with the starting cup of the starting flywheel, which avoids the defect of the existing spring being unable to pop out after being driven, and improves the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structural disassembly of an embodiment of the utility model;

[0017] Figure 2 A cross-sectional view of an embodiment of the utility model;

[0018] Figure 3 for Figure 2 Schematic cross-sectional view of the AA section;

[0019] Figure 4 It is a schematic diagram of the starting disc wheel and the claw;

[0020] Figure 5 for Figure 4 Cross-sectional view of the middle BB section;

[0021] Referring to the accompanying drawings, there are a curved guide rod 1, a claw 2, a starting disc wheel 3, an energy storage spring 4, a pull disc wheel 5, a return spring 6, and a central shaft 8. DETAILED DESCRIPTION

[0022] The utility model will now be further described with reference to the accompanying drawings.

[0023] See also Figures 1 to 3 , Figures 1 to 3What is shown is an embodiment of the utility model, a two-claw easy-to-start hand pull disc for a two-stroke engine, which mainly includes a plastic outer cover with a central axis cone, a pull disc wheel and a starting disc wheel arranged coaxially, and a through hole is respectively provided in the center of both, which pass through and are respectively sleeved on the central axis and rotate around it; further, both are preferably made of PA6 plastic.

[0024] The inner wall of the outer cover and the outer wall of the pull-disc wheel are connected by a return spring (coil spring), and a conical air inlet hole is provided on the outer cover. The pull-disc wheel rotates around the rotating shaft under the action of the external tension of the pull rope, and the return spring coils tighten. When the tension of the pull rope is removed, the pull-disc wheel returns to its original position under the action of the return spring, and the return spring returns to a relaxed state.

[0025] The inner wall of the pull-disc wheel is connected to the outer wall of the start-disc wheel by an energy storage spring (coil spring). A pull rope is also fixed to the outer wall of the pull-disc wheel. Furthermore, an annular groove is also provided on the outer edge (outer ring) of the pull-disc wheel, distributed along the circumference; one end of the pull rope is fixed to the annular groove and is wound in the annular groove when stored; the pull rope extends outward from the inside of the outer cover through the opening.

[0026] See also Figure 4 and Figure 5 The starting disc wheel is also provided with claws, and the lower end faces of the two claws are respectively set in the sliding groove of the upper end face of the starting disc through the rotating shaft, and can rotate optionally; the upper end faces of the two claws are provided with sliders; the middle part of the curved guide rod sleeve is fixed on the central axis, and it extends radially out of the guide rail. The circular slider is sleeved in the inner edge of the outer end of the arc-shaped guide rail and can rotate. As the starting disc wheel rotates, the sliding groove rotates accordingly, and then drives the rotating shaft in the sliding groove to rotate. Driven by the rotating shaft, the outer end of the guide rail drives the slider to rotate, and then drives the rotation of the claws, so that the ends of the claws can be radially extended along the curved guide rod.

[0027] When the starter wheel is reset, the guide rail and the rotating shaft are driven to rotate in the opposite direction, and the claw can be retracted, thereby avoiding the defect that the existing spring drive cannot be ejected after being extended.

[0028] When the pull rope is pulled by hand, the starter disc wheel is immediately driven to rotate, and the claw fixed on the starter disc wheel moves synchronously along the curved guide rod. The curved guide rod fixed on the central axis does not move, and the synchronously rotating claw moves along the curved guide rod to extend the claw and engage with the flywheel starter cup, which can drive the flywheel to rotate and ignite. When the starter disc rotates: on the one hand, it drives the claw to extend, and on the other hand, the rotation force is stored through the contraction spring. When it is pulled next time, only a small amount of manual force and the spring release force are needed to easily rotate the flywheel and ignite and start smoothly.

[0029] As the energy storage spring continues to shrink with the rotation of the pull disc wheel, the torque on the starting disc wheel will continue to increase. When the torque value of the energy storage spring is greater than the engine starting resistance torque, the engine flywheel is driven to rotate smoothly under the action of the starting disc wheel and the two claws. After starting, the pull rope tension is removed, and the return spring drives the pull disc wheel to reset.

[0030] Under the premise of a certain engine starting resistance torque, this embodiment uses the different force arms relative to the center of the rotating shaft between the energy storage spring of the starting disc wheel that receives the torque and the pull rope of the pulling disc wheel to set a labor-saving lever. The user will feel easy and labor-saving when starting by hand, and at the same time the smoothness is improved, the requirements on the user's physical pulling force and pulling skills are greatly reduced, and it can better meet the needs of various users.

[0031] This embodiment also provides a two-stroke engine, including the starter hand pull plate of the above embodiment, which will not be described in detail. The above describes the implementation of the utility model in combination with the drawings and embodiments. The structure given in the embodiment does not constitute a limitation of the utility model. Those skilled in the art can make adjustments as needed. Various deformations or modifications within the scope of the attached claims are within the scope of protection.

Claims

1. A starter hand pull tray, comprising an outer cover, characterized in that: It also includes a pull disc wheel, a start disc wheel, a return spring and an energy storage spring which are coaxially arranged; The inner wall of the outer cover and the outer wall of the pull-disc wheel are connected via a return spring, and the inner wall of the pull-disc wheel and the outer wall of the start-disc wheel are connected via an energy storage spring; a pull rope is also fixed to the outer wall of the pull-disc wheel; The starting disc wheel is provided with a claw, and the claw is engaged with the starting flywheel; Pulling the pull rope drives the pull disc wheel to rotate, and the energy storage spring coil contracts and stores energy until the torque is greater than the resistance torque of the starting flywheel; after completion, the return spring drives the pull disc wheel to reset.

2. The starting hand pull plate according to claim 1, characterized in that: There are two clamping claws, which can be extended / retracted respectively along the direction of the curved guide rod to achieve engagement / disengagement with the starting flywheel.

3. The starting hand pull plate according to claim 2, characterized in that: The lower end faces of the claws are respectively arranged in the sliding grooves of the upper end face of the starting wheel through the rotating shafts and can rotate optionally; the upper end faces of the two claws are provided with sliding blocks; the middle part of the curved guide rod sleeve is fixed on the central axis, and the guide rail is radially extended.

4. The starting hand pull plate according to claim 1, characterized in that: The return spring and the energy storage spring are coil springs.

5. The starting hand pull plate according to claim 1, characterized in that: An annular groove is arranged on the outer edge of the pull plate wheel, and the pull rope is fixed and wound in the annular groove.

6. The starting hand pull plate according to claim 4, characterized in that: The outer cover is provided with an opening for the draw cord to extend out.

7. The starting hand pull plate according to claim 1, characterized in that: The outer cover is provided with a conical air inlet hole.

8. Two-stroke engine, characterized in that: It comprises a starting hand pull plate as described in any one of claims 1-6.

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