Engine

Abstract

The utility model provides an engine which comprises a cylinder cover, an engine body, a crankshaft, a flywheel, a balance shaft, a balance shaft gear set, a first balance block and a fastening assembly, the balance shaft comprises a first shaft section, a second shaft section and a third shaft section, the second shaft section comprises a conical installation face, and the conical installation face is arranged in a space formed between the flywheel and the engine body. The first balance block is provided with a conical hole face corresponding to the conical installation face, and the conical installation face is sleeved with the first balance block through the conical hole face. According to the engine, due to the design of the engine body structure and the balance shaft structure, unbalanced torque which cannot be continuously increased can be continuously increased, the whole engine can balance reciprocating inertia force by 100%, even the whole engine is overbalanced, vibration of the whole engine is reduced, vibration noise is reduced, and meanwhile the engine can be more conveniently assembled with a balance block and replaced with the balance block.

Description

Technical Field

[0001] This utility model relates to the field of power machinery, and in particular to an engine. Background Technology

[0002] In existing technologies, small air-cooled engines are characterized by high speed, strong burst pressure, large vibration, and high noise. While enjoying their many advantages, users are often troubled by the vibration and noise they generate. Single-cylinder air-cooled diesel engines cannot achieve self-balancing through crankshaft balance weights; they can only offset some of the reciprocating inertial forces through balance weights on the balance shaft. However, small air-cooled engines are almost all single-shaft balanced, and due to limited space, the size of the balance weights cannot be increased arbitrarily. Therefore, most diesel engines cannot effectively balance the reciprocating inertial forces, resulting in all small air-cooled engines exhibiting high vibration and noise.

[0003] Therefore, it is necessary to provide an engine that overcomes the defects mentioned above. Utility Model Content

[0004] The purpose of this invention is to provide an engine that modifies the body structure and balance shaft structure, allowing the unbalanced torque that cannot be increased further to continue to increase, enabling the entire engine to better balance the reciprocating inertial force, or even achieve over-balance, thereby reducing overall engine vibration and vibration noise.

[0005] According to one aspect of the present invention, an engine is provided, with the cylinder exhaust side as the rear, including a cylinder head, an engine block, a crankshaft, a flywheel, a balance shaft, a balance shaft gear set, a first balance block, and a fastening assembly. The engine block is located at the lower end of the cylinder head, the crankshaft is located in the engine block for outputting power, the flywheel is located at the rear of the engine block and is coaxial with the crankshaft, the balance shaft is arranged parallel to the crankshaft, and the balance shaft includes a first shaft section located in the engine block, a second shaft section extending rearward from the engine block along the first shaft section, and a third shaft section located at the end of the second shaft section and having a diameter smaller than the second shaft section. The second shaft section is at least partially placed in the space formed between the flywheel and the body. The second shaft section includes a tapered mounting surface with a diameter that gradually decreases from the first shaft section to the second shaft section. The tapered mounting surface is placed in the space formed between the flywheel and the body. The balance shaft gear set is connected to the crankshaft and the balance shaft to realize that the crankshaft drives the balance shaft to rotate synchronously. The first balance block is provided with a tapered hole surface corresponding to the tapered mounting surface. The first balance block is sleeved on the tapered mounting surface through the tapered hole surface. The fastening assembly is placed on the balance shaft to position and fix the first balance block on the balance shaft.

[0006] By modifying the machine body structure and balance shaft structure, the unbalanced torque, which could not be increased further, can be increased, allowing the entire machine to achieve 100% balance of reciprocating inertial forces, or even overbalance, thus reducing overall machine vibration and noise. It also facilitates the assembly and replacement of balance weights.

[0007] Preferably, the fastening assembly includes a locating key, a fastening washer, and a fastening nut. The locating key is placed between the first balance block and the second shaft segment for positioning; the fastening washer is fitted onto the third shaft segment and abuts against the balance block; the fastening nut is threaded to the third shaft segment and abuts against the fastening washer to lock the first balance block. This design facilitates positioning and provides better fastening while also allowing for easy disassembly or replacement later.

[0008] Preferably, the conical mounting surface is provided with a first keyway, and the conical hollow surface is provided with a second keyway corresponding to the first keyway. The positioning key is placed in the first keyway and the second keyway to achieve the positioning of the balance block.

[0009] Preferably, the body further includes a first support for supporting the front end of the balance shaft and a second support for supporting the rear end of the balance shaft. The first support is placed inside the body, and the second support includes a through hole for passing through the second shaft segment. The diameter of the through hole is smaller than the inner diameter of the second support.

[0010] Preferably, the engine further includes a first bearing sleeved on the first shaft segment and placed within a first support, and a second bearing sleeved on the second shaft segment and placed within a second support, with both ends of the balance shaft passing through the inner rings of the first bearing and the second bearing, respectively. Further, the front end of the first shaft segment is placed within the inner ring of the first bearing, and the second shaft segment is placed within the inner ring of the second bearing.

[0011] Preferably, the engine further includes an oil seal sleeved on the second shaft section and located in the through hole, the oil seal being positioned between the second bearing and the tapered mounting surface.

[0012] Preferably, the balance shaft further includes a second balance block and a third balance block integrally formed with the first shaft segment.

[0013] Preferably, the balance shaft is positioned diagonally below the crankshaft, and the balance weight is fitted onto the crankshaft and positioned adjacent to the engine block.

[0014] Preferably, the balance shaft gear set includes a balance shaft drive gear sleeved on the crankshaft and a balance shaft driven gear sleeved on the balance shaft. The balance shaft driven gear meshes with the balance shaft drive gear and rotates synchronously with the balance shaft drive gear. The rotation of the crankshaft drives the balance shaft drive gear to rotate, thereby causing the balance shaft driven gear to rotate synchronously with the balance shaft, using inertial force to counteract engine vibration.

[0015] Preferably, the engine also includes a camshaft that meshes with the crankshaft via a gear set, and the crankshaft rotation drives the camshaft to rotate.

[0016] The present invention provides an engine that, by changing the body structure and balance shaft structure, allows the unbalanced torque that could not be increased to continue to increase, enabling the whole machine to better balance the reciprocating inertial force, or even achieve over-balance, thereby reducing the vibration and noise of the whole machine, and also making it easier to assemble and replace the balance weights. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 This is a front view of the engine;

[0019] Figure 2 For along Figure 1 A cross-sectional view at position AA in the middle;

[0020] Figure 3 for Figure 2 A magnified view of a portion of position B in the middle;

[0021] Figure 4 for Figure 2 A magnified view of a portion of position B in the middle;

[0022] Figure 5 This is a schematic diagram of a partial explosion of the balance shaft and related components.

[0023] Explanation of icon numbers:

[0024] 1. Cylinder head; 2. Engine block; 3. Crankshaft; 4. Balance shaft; 5. Flywheel; 6. First balance block; 7. Fastening assembly; 8. Balance shaft gear set; 9. Oil seal; 10. Second bearing; 11. First bearing; 12. Camshaft; 201. Second support; 201a. Through hole; 202. First support; 401. Third shaft section; 402. Second shaft section; 402a. Tapered mounting surface; 403. First shaft section; 404. Second balance block; 405. Third balance block; 701. Fastening nut; 702. Fastening washer; 703. Locating key; 801. Balance shaft drive gear; 802. Balance shaft driven gear; A1. First keyway; A2. Second keyway. Detailed Implementation

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0027] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0028] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] See Figures 1 to 4As shown, this embodiment provides an engine, with the cylinder exhaust side as the rear, including a cylinder head 1, an engine block 2, a crankshaft 3, a flywheel 5, a balance shaft 4, a balance shaft gear set 8, a first balance block 6, and a fastening assembly 7. The engine block 2 is located at the lower end of the cylinder head 1, the crankshaft 3 is located inside the engine block 2 for outputting power, the flywheel 5 is located on the rear side of the engine block 2 and is coaxially arranged with the crankshaft 3, the balance shaft 4 is arranged parallel to the crankshaft 3, and the balance shaft 4 includes a first shaft section 403 located in the engine block 2, a second shaft section 402 extending rearward from the engine block 2 along the first shaft section 403, and a third shaft section 401 located at the end of the second shaft section 402 and having a diameter smaller than the second shaft section 402. The second shaft section 403... 02 is at least partially placed in the space formed between the flywheel 5 and the body 2. The second shaft segment 402 includes a tapered mounting surface 402a whose diameter gradually decreases from the first shaft segment 403 to the second shaft segment 402. The tapered mounting surface 402a is placed in the space formed between the flywheel 5 and the body 2. The balance shaft gear set 8 is connected to the crankshaft 3 and the balance shaft 4 to realize that the crankshaft 3 drives the balance shaft 4 to rotate synchronously. The first balance block 6 is provided with a tapered hole surface corresponding to the tapered mounting surface 402a. The first balance block 6 is sleeved on the tapered mounting surface 402a through the tapered hole surface. The fastening component 7 is placed on the balance shaft 4 to position and fix the first balance block 6 on the balance shaft 4.

[0032] The fastening assembly 7 includes a positioning key 703, a fastening washer 702, and a fastening nut 701. The positioning key 703 is placed between the first balance block 6 and the second shaft segment 402 for positioning. The fastening washer 702 is sleeved on the third shaft segment 401 and abuts against the balance block. The third shaft segment 401 has a threaded structure. The fastening nut 701 is threadedly connected to the third shaft segment 401 and abuts against the fastening washer 702 to lock the first balance block 6, thereby achieving positioning and fastening, and facilitating subsequent disassembly or replacement.

[0033] The conical mounting surface 402a is provided with a first keyway A1, and the conical hollow surface is provided with a second keyway A2 corresponding to the first keyway A1. The positioning key 703 is placed in the first keyway A1 and the second keyway A2 to realize the positioning of the balance block.

[0034] The body 2 also includes a first support 202 for supporting the front end of the balance shaft 4 and a second support 201 for supporting the rear end of the balance shaft 4. The first support 202 is placed inside the body 2. The second support 201 includes a through hole 201a for passing through the second shaft section 402. The diameter of the through hole 201a is smaller than the inner diameter of the second support 201.

[0035] The engine also includes a first bearing 11 sleeved in the first shaft section 403 and placed in the first support 202, and a second bearing 10 sleeved in the second shaft section 402 and placed in the second support 201. The two ends of the balance shaft 4 are respectively inserted through the inner rings of the first bearing 11 and the second bearing 10. Further, the front end of the first shaft section 403 is placed in the inner ring of the first bearing 11, and the second shaft section 402 is placed in the inner ring of the second bearing 10.

[0036] The engine also includes an oil seal 9 fitted onto the second shaft section 402 and positioned in the through hole 201a. The oil seal 9 is positioned between the second bearing 10 and the tapered mounting surface 402a.

[0037] The balance shaft 4 also includes a second balance block 404 and a third balance block 405 integrally formed with the first shaft segment 403.

[0038] The balance shaft 4 is placed diagonally below the crankshaft 3, and the balance weight is fitted onto the crankshaft 3 and is arranged adjacent to the engine block 2.

[0039] The balance shaft gear set 8 includes a balance shaft 4 drive gear 801 sleeved on the crankshaft 3 and a balance shaft driven gear 802 sleeved on the balance shaft 4. The balance shaft driven gear 802 meshes with the balance shaft drive gear 801 and rotates synchronously with the balance shaft drive gear 801. The rotation of the crankshaft 3 drives the balance shaft drive gear 801 to rotate, thereby causing the balance shaft driven gear 802 to drive the balance shaft 4 to rotate synchronously, using inertial force to counteract engine vibration.

[0040] The engine also includes a camshaft 12 that meshes with the crankshaft 3 via a gear set, and the camshaft 12 is driven to rotate by the rotation of the crankshaft 3.

[0041] The engine provided by this utility model, by changing the structure of the body 2 and the balance shaft 4, allows the unbalanced torque that cannot be increased to continue to increase, so that the whole machine can better achieve balance of reciprocating inertial force, or even achieve over-balance, reducing the vibration of the whole machine and reducing vibration noise, while also making it easier to assemble and replace the balance weight.

[0042] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. An engine, with the cylinder exhaust side as the rear, characterized in that, include: Cylinder head; The engine body is located at the lower end of the cylinder head; A crankshaft, which is housed within the engine body for outputting power; A flywheel, which is located at the rear of the machine body and is coaxially arranged with the crankshaft; A balance shaft is provided, which is parallel to the crankshaft. The balance shaft includes a first shaft section located on the body, a second shaft section extending rearward from the body along the first shaft section, and a third shaft section located at the end of the second shaft section and having a diameter smaller than the second shaft section. The second shaft section is at least partially located within the space formed between the flywheel and the body. The second shaft section includes a tapered mounting surface with a diameter that gradually decreases from the first shaft section to the second shaft section. The tapered mounting surface is located within the space formed between the flywheel and the body. A balance shaft gear set is connected to the crankshaft and the balance shaft to enable the crankshaft to drive the balance shaft to rotate synchronously. A first balance block is provided with a tapered hole surface corresponding to the tapered mounting surface, and the first balance block is sleeved on the tapered mounting surface through the tapered hole surface; A fastening assembly is placed on the balance shaft to position and fix the first balance block on the balance shaft.

2. An engine as described in claim 1, characterized in that, The fastening assembly includes a positioning key, a fastening washer, and a fastening nut. The positioning key is placed between the first balance block and the second shaft segment for positioning. The fastening washer is sleeved on the third shaft segment and abuts against the balance block. The fastening nut is threaded to the third shaft segment and abuts against the fastening washer to lock the first balance block.

3. An engine as described in claim 2, characterized in that, The tapered mounting surface is provided with a first keyway, and the tapered hole surface is provided with a second keyway corresponding to the first keyway. The positioning key is placed in the first keyway and the second keyway to achieve positioning of the balance block.

4. An engine as described in claim 3, characterized in that, The body also includes a first support for supporting the front end of the balance shaft and a second support for supporting the rear end of the balance shaft. The first support is placed inside the body, and the second support includes a through hole for passing through the second shaft segment. The diameter of the through hole is smaller than the inner diameter of the second support.

5. An engine as described in claim 4, characterized in that, It also includes a first bearing sleeved on the first shaft segment and placed in the first support, and a second bearing sleeved on the second shaft segment and placed in the second support, with the two ends of the balance shaft passing through the inner rings of the first bearing and the second bearing, respectively.

6. An engine as described in claim 5, characterized in that, It also includes an oil seal sleeved on the second shaft segment and placed in the through hole, the oil seal being placed between the second bearing and the tapered mounting surface.

7. An engine as described in claim 6, characterized in that, The balance shaft also includes a second balance block and a third balance block integrally formed with the first shaft segment.

8. An engine as described in claim 1 or 7, characterized in that, The balance shaft is positioned diagonally below the crankshaft, and the balance weight is fitted onto the crankshaft and disposed adjacent to the engine block.

9. An engine as described in claim 8, characterized in that, The balance shaft gear set includes a balance shaft drive gear sleeved on the crankshaft and a balance shaft driven gear sleeved on the balance shaft. The balance shaft driven gear meshes with the balance shaft drive gear and rotates synchronously with the balance shaft drive gear. The rotation of the crankshaft drives the balance shaft drive gear to rotate, thereby causing the balance shaft driven gear to rotate synchronously with the balance shaft, using inertial force to counteract engine vibration.

Images