Two-stroke engine crankshaft balance shaft structure

Abstract

The utility model discloses a two-stroke engine crankshaft balance shaft structure which comprises a crankshaft assembly and a balance shaft assembly, a driving gear used for driving the balance shaft assembly to rotate is arranged in the crankshaft assembly, and the balance shaft assembly comprises a rotating shaft. The driven gear is mounted at the end part of the rotating shaft, and the driven gear is meshed with the driving gear in the crankshaft assembly; the balance block is mounted at the end part of one end, far away from the driven gear, of the rotating shaft; the balancing weight is mounted on the side wall of the driven gear; the engine balance shaft assembly has the beneficial effects that the working effect of the balance shaft assembly can be ensured without arranging a plurality of balance blocks in the balance shaft assembly, so that the weight of the balance shaft assembly is reduced, and the weight of an engine is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a balance shaft structure of engine crankshaft, especially two -stroke engine crankshaft balance shaft structure. BACKGROUND

[0002] Engine can produce larger vibration when working, especially two -stroke engine, and its crankshaft needs to fire once every turn, so its inertia force and vibration frequency are 2 times (under the same speed) of four -stroke, and in order to reduce the vibration of engine, there is a balance shaft structure in the engine, and the balance shaft structure can be used to offset the inertia vibration generated when the engine works.

[0003] In the prior art, such as the balance shaft structure of engine crankshaft disclosed in the publication No. CN 208252663 U, the included angle between the first balance block and the second balance block arranged on the balance shaft in the rotation direction is 90°, so that the damping effect is better, the stability of engine working is further improved, and comfortable riding feeling is brought.

[0004] However, it still has some deficiencies, for example, in order to ensure the effect of the balance shaft offsetting the vibration, a plurality of balance blocks are arranged in the balance shaft structure, but in this way, the weight of the balance shaft structure is increased, and then the weight of the engine is increased. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that a two -stroke engine crankshaft balance shaft structure is provided, which does not need to arrange a plurality of balance blocks and can ensure the working effect of the balance shaft structure.

[0006] The utility model adopts the technical scheme that the two -stroke engine crankshaft balance shaft structure comprises a crankshaft assembly and a balance shaft assembly, a driving gear for driving the balance shaft assembly to rotate is arranged in the crankshaft assembly, the balance shaft assembly comprises a rotating shaft, a driven gear is installed at the end of the rotating shaft, the driven gear is engaged with the driving gear in the crankshaft assembly, a balance block is installed at the end of the rotating shaft away from the driven gear, a counterweight is installed on the side wall of the driven gear, and the balance block and the counterweight are both arranged in a semicircular shape.

[0007] Further preferred scheme of the utility model is that the counterweight is integrally formed with the driven gear.

[0008] Further preferred scheme of the utility model is that a weight reduction groove is formed in the side wall of the driven gear, and the weight reduction groove is formed in the side wall of the end of the driven gear away from the counterweight.

[0009] The further preferred scheme of the utility model is that the balance block and the counterweight block are arranged in an angle on the rotating shaft.

[0010] The further preferred scheme of the utility model is that a plurality of weight-reducing through holes are arranged in the weight-reducing groove.

[0011] Compared with the prior art, the utility model has the advantages that when the crankshaft assembly is working, the driving gear can drive the driven gear to rotate, the rotation of the driven gear can drive the rotating shaft and the balance block to rotate, and the counterweight block installed on the driven gear also rotates, so that the effect of the balance block can be achieved when the driven gear rotates, the working effect of the balance shaft assembly can be ensured without arranging a plurality of balance blocks in the balance shaft assembly, the weight of the balance shaft assembly is reduced, and the weight of the engine is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model will be further described in detail below by combining with the drawings and preferred embodiments, but the person skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be regarded as the limitation on the scope of the utility model. In addition, unless specifically pointed out, the drawings only schematically show the composition or structure of the described object conceptually and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0013] Figure 1 It is the three-dimensional structure schematic view of the utility model;

[0014] Figure 2 It is the isometric three-dimensional structure schematic view of the utility model;

[0015] Figure 3 It is the three-dimensional structure schematic view of the balance shaft assembly in the utility model;

[0016] Figure 4 It is the isometric three-dimensional structure schematic view of the balance shaft assembly in the utility model.

[0017] In the drawing: 1, crankshaft assembly;11, driving gear;2, balance shaft assembly;21, rotating shaft;22, balance block;23, driven gear;24, counterweight block;25, weight-reducing groove;26, weight-reducing through hole. DETAILED DESCRIPTION

[0018] The preferred embodiments of the utility model will be described in detail below with reference to the drawings. The person skilled in the art will appreciate that these descriptions are only descriptive, exemplary, and should not be interpreted as limiting the protection scope of the utility model.

[0019] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0020] This embodiment mainly describes the structure of the crankshaft balance shaft of a two-stroke engine, as detailed below:

[0021] like Figures 1-4 As shown, the crankshaft balance shaft structure of the stroke engine includes a crankshaft assembly 1 and a balance shaft assembly 2. The crankshaft assembly 1 is provided with a drive gear 11 for driving the balance shaft assembly 2 to rotate. Thus, when the crankshaft assembly 1 is working, it can drive the balance shaft assembly 2 to rotate through the drive gear 11. When the balance shaft assembly 2 rotates, the reverse centrifugal force generated by the rotation can counteract the vibration generated during engine operation, thereby ensuring the stability of the engine during operation.

[0022] The balance shaft assembly 2 includes a rotating shaft 21 and driven gears 23 and balance blocks 22 respectively installed on the left and right ends of the rotating shaft 21. The driven gears 23 mesh with the driving gears 11 in the crankshaft assembly 1. A counterweight 24 is provided on the side wall of the driven gears 23. Both the balance blocks 22 and the counterweights 24 are semi-circular. When the crankshaft assembly 1 is working, the driving gears 11 can drive the driven gears 23 to rotate. As the driven gears 23 rotate, they can drive the rotating shaft 21 and the balance blocks 22 to rotate. At the same time, the counterweights 24 installed on the driven gears 23 also rotate. Since the counterweights 24 are installed on the driven gears 23, they can also act as balance blocks 22 when the driven gears 23 rotate. In this way, it is not necessary to set multiple balance blocks 22 in the balance shaft assembly 2 to ensure the working effect of the balance shaft assembly 2, thereby reducing the weight of the balance shaft assembly 2 and thus reducing the weight of the engine.

[0023] Furthermore, in order to ensure the effect of the reverse centrifugal force generated by the rotating shaft 21, the counterweight 22 and the driven gear 23 during rotation, the counterweight 22 and the counterweight 24 are arranged at an angle on the rotating shaft 21.

[0024] Furthermore, in order to ensure the firmness of the connection between the driven gear 23 and the counterweight 24, the counterweight 24 and the driven gear 23 are integrally formed.

[0025] Furthermore, in order to further reduce the weight of the balance shaft assembly 2, a weight reduction groove 25 is provided on the side wall of the driven gear 23, and the weight reduction groove 25 is provided on the side wall of the driven gear 23 away from the counterweight block 24. At the same time, in order to further reduce the weight of the balance shaft assembly 2, a plurality of weight reduction through holes 26 are provided in the weight reduction groove 25.

[0026] In the description of the utility model, it needs to explain, the term "upper", "lower", "front", "back", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, or is the orientation or position relation of the utility model product when using the usual placement, just is for the convenience of describing the utility model and simplifying the description, and is not indicate or imply the device or element must have the specific orientation, with the specific orientation structure and operation, therefore can not be understood as the restriction of the utility model.

[0027] The two-stroke engine crankshaft balance shaft structure provided by the utility model is described in detail above, the principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment is only used for helping to understand the utility model and core idea. It should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. A two-stroke engine crankshaft counter shaft arrangement comprising a crankshaft assembly and a counter shaft assembly, said crankshaft assembly being provided with a driving gear for driving the counter shaft assembly in rotation, characterized in that: The balance shaft assembly comprises a rotating shaft; a driven gear mounted on the end of the rotating shaft, the driven gear being engaged with a driving gear in the crankshaft assembly; a balance block mounted on the end of the rotating shaft away from the driven gear; a counterweight mounted on the side wall of the driven gear; wherein the balance block and the counterweight are both in the shape of a semicircle.

2. The two-stroke engine crankshaft balance shaft arrangement according to claim 1, characterized in that: The counterweight is integrally formed with the driven gear.

3. The two-cycle engine crankshaft counterbalance shaft arrangement of claim 1, wherein: A weight-reducing groove is formed on the side wall of the driven gear, the weight-reducing groove being formed on the side wall of the driven gear away from the counterweight.

4. The two-cycle engine crankshaft counterbalance shaft arrangement of claim 1, wherein: The balance block and the counterweight are arranged at an angle on the rotating shaft.

5. The two-cycle engine crankshaft counterbalance shaft arrangement of claim 3, wherein: A plurality of weight-reducing through holes are formed in the weight-reducing groove.

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