Engine

Abstract

The utility model discloses an engine which comprises a box body, a crankshaft is connected to the box body in a rotating mode, a primary speed reduction driving gear is connected to the crankshaft in a key mode, and a primary speed reduction driven gear meshed with the primary speed reduction driving gear is connected to the box body in a rotating mode. A backlash adjusting gear meshed with the primary speed reduction driven gear is arranged on the side, located on the primary speed reduction driving gear, of the crankshaft, the backlash adjusting gear is in sliding fit with the crankshaft, and a torsional spring is connected between the backlash adjusting gear and the crankshaft. According to the scheme, the problem that in the prior art, abnormal sound of an engine is serious is solved.

Description

Technical Field

[0001] The utility model relates to an engine. Background Art

[0002] Chinese patent document CN201620986U discloses an engine for a light motorcycle and a power-assisted vehicle, comprising: a cylinder block and a carburetor; a cylinder head is mounted on the cylinder block, a cylinder head cover is mounted on the cylinder head, the carburetor is connected to the cylinder block through an oil pipe, a piston is arranged in the cylinder block, and an engine cover body formed by a left cover and a right cover; the cylinder block is mounted on the front end of the engine cover body, a crankshaft is rotatably mounted between the left cover and the right cover, a magneto rotor is fixedly mounted on the crankshaft, a second reduction gear is fixedly mounted on the magneto rotor, one end of the piston is hinged to the connecting rod big end of the crankshaft, a primary driving gear is mounted on the crankshaft, a left body and a right body are fixedly mounted on the rear end of the engine cover body, a pedal start shaft is rotatably mounted between the left body and the right body. A pedal starter gear and a transmission sprocket are installed on the pedal starter shaft. A sliding hole is opened in the left cover. A main shaft is slidably inserted in the sliding hole. The main shaft is installed with a main shaft gear and a primary driven gear. The primary driving gear is engaged with the primary driven gear. The main shaft gear is engaged with the starting gear. A starting motor and an electric starting one-way device are installed on the engine cover. An electric starting gear is provided on the starting shaft of the starter motor. A first reduction gear is fixedly mounted on the electric starting one-way device. A second driving gear is slidably mounted on the electric starting one-way device. The second driving gear is intermittently engaged with the second reduction gear. A clutch is provided on the crankshaft. The clutch has a clutch outer hub and a clutch throw block. The clutch outer hub is rotatably sleeved on the crankshaft, and the inner ring body of the clutch throw block is fixedly mounted on the crankshaft.

[0003] The above-mentioned prior art achieves the effect of reducing the size and weight of the engine. However, in actual use, the engine has serious gear rattling and abnormal noise, which deviates the noise index of the whole machine and the noise reduction performance is insufficient. Utility Model Content

[0004] The purpose of the utility model is to provide an engine to solve the problem of serious abnormal noise of the engine in the prior art.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the present utility model provides an engine, including a housing, a crankshaft is rotatably connected to the housing, a primary reduction driving gear is keyed to the crankshaft, a primary reduction driven gear meshing with the primary reduction driving gear is rotatably connected to the housing, a side clearance adjustment gear meshing with the primary reduction driven gear is provided on one side of the crankshaft, the side clearance adjustment gear is slidably fitted with the crankshaft, and a torsion spring is connected between the side clearance adjustment gear and the crankshaft.

[0006] The beneficial effect of this basic solution is that the side clearance adjustment gear is matched with the primary reduction driving gear and the primary reduction driven gear, so that the three are always in a tight fit state, thereby reducing the gear rattling sound during rotation, and further reducing the noise and abnormal sound when the engine is working.

[0007] Preferably, the crankshaft is provided with a fixing hole connected to one end of the torsion spring in the radial direction, and the backlash adjustment gear is provided with a fixing groove connected to the other end of the torsion spring. Such an arrangement simplifies the arrangement of the backlash adjustment gear and is conducive to improving reliability.

[0008] Preferably, the backlash adjustment gear is located on the side of the primary reduction driving gear away from the crank of the crankshaft. Such an arrangement is beneficial to improving the working stability of the primary reduction driving gear.

[0009] Preferably, the end of the crankshaft located on the side clearance adjustment gear, away from the primary reduction driving gear, is connected to the housing via a first bearing. This arrangement, by supporting the crankshaft end via the housing, prevents the side clearance adjustment gear and the primary reduction driving gear from falling off during operation, thereby improving engine reliability.

[0010] Preferably, a first oil seal is further provided between the end of the first bearing away from the backlash adjustment gear and the housing of the crankshaft. With such a configuration, the first oil seal can reduce the loss of crankshaft lubricating oil, thereby improving the lubrication effect of the crankshaft.

[0011] Preferably, one end of the primary reduction driven gear is connected to the housing via a second bearing, and the other end is connected to the housing via a third bearing. This arrangement is beneficial to improving the working stability of the primary reduction driven gear and reducing abnormal noise generated by the engine.

[0012] Preferably, a second oil seal is connected between the end of the primary reduction driven gear away from the interior of the housing and the housing. This arrangement prevents lubricating oil in the housing from leaking through the gap between the primary reduction driven gear and the housing, which is beneficial to improving the lubrication effect in the housing.

[0013] The utility model has the following beneficial effects:

[0014] This solution reduces the noise and abnormal sounds inside the engine when the engine is running, thereby improving the noise reduction performance of the engine. In particular, when the reduction driven gear is directly connected to the housing, the abnormal noise of the engine is still relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of an engine embodiment of the present utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the coordination between the primary reduction driving gear, the primary reduction driven gear and the backlash adjustment gear;

[0017] Figure 3 for Figure 1 A three-dimensional diagram of the torsion spring. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods:

[0019] The reference numerals in the drawings of the specification include: housing 1, crankshaft 2, primary reduction driving gear 3, side clearance adjustment gear 4, torsion spring 5, first bearing 6, first oil seal 7, primary reduction driven gear 8, second bearing 9, second oil seal 10, third bearing 11, fixing hole 12.

[0020] The embodiment is basically as shown in the attached Figure 1 、 Figure 2 and Figure 3 The figure shows an engine, comprising a housing 1, a crankshaft 2 being rotatably connected to the housing 1, a primary reduction driving gear 3 being keyed to the crankshaft 2, and a primary reduction driven gear 8 being rotatably connected to the housing 1 and meshing with the primary reduction driving gear 3. In this embodiment, a backlash adjustment gear 4 is provided on one side of the crankshaft 2, meshing with the primary reduction driven gear 8, and the backlash adjustment gear 4 is in sliding engagement with the crankshaft 2. A torsion spring 5 is connected between the backlash adjustment gear 4 and the crankshaft 2.

[0021] In this embodiment, the backlash adjustment gear 4 is located on the side of the crank of the primary reduction driving gear 3 away from the crankshaft 2. In this embodiment, the torsion spring 5 is mounted on the crankshaft 2. The crankshaft 2 is radially provided with a fixing hole 12 connected to one end of the torsion spring 5, and the backlash adjustment gear 4 is provided with a fixing groove connected to the other end of the torsion spring 5. The end of the crankshaft 2 located at the backlash adjustment gear 4 away from the primary reduction driving gear 3 is connected to the housing 1 through a first bearing 6. The provision of the first bearing 6 can not only support the end of the crankshaft 2 and improve the stability of the crankshaft 2, but also prevent the backlash adjustment gear 4 and the primary reduction driving gear 3 from falling off. A first oil seal 7 is also provided between the end of the crankshaft 2 located at the first bearing 6 away from the backlash adjustment gear 4 and the housing 1.

[0022] In this embodiment, one end of the primary reduction driven gear 8 is connected to the housing 1 via a second bearing 9, and the other end is connected to the housing 1 via a third bearing 11. A second oil seal 10 is connected between the end of the primary reduction driven gear 8 away from the interior of the housing 1 and the housing 1.

[0023] By adopting this solution, the side clearance adjustment gear 4 is matched with the primary reduction driving gear 3 and the primary reduction driven gear 8, so that the three are always in a tight fit state, thereby reducing the gear rattling sound during rotation, and then reducing the noise when the engine is working, thereby improving the noise reduction performance of the engine.

[0024] The above description is merely an embodiment of the present invention. The well-known specific structures and characteristics of the scheme are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention. These modifications and improvements should also be considered within the scope of protection of the present invention and will not affect the effectiveness of the implementation of the present invention or the practical application of the patent.

Claims

1. An engine comprising a housing, to which a crankshaft is rotatably connected, characterized in that: The crankshaft is keyed to a primary reduction driving gear, the housing is rotatably connected to a primary reduction driven gear meshing with the primary reduction driving gear, a side clearance adjustment gear meshing with the primary reduction driven gear is provided on one side of the crankshaft located on the primary reduction driving gear, the side clearance adjustment gear is slidably fitted with the crankshaft, and a torsion spring is connected between the side clearance adjustment gear and the crankshaft; the crankshaft is radially provided with a fixing hole connected to one end of the torsion spring, and the side clearance adjustment gear is provided with a fixing groove connected to the other end of the torsion spring.

2. An engine according to claim 1, characterized in that: The backlash adjusting gear is located on a side of the primary reduction driving gear away from the crank of the crankshaft.

3. An engine according to claim 2, characterized in that: The end of the crankshaft located at the side clearance adjustment gear away from the primary reduction driving gear is connected to the housing through a first bearing.

4. An engine according to claim 3, characterized in that: A first oil seal is further provided between the end of the first bearing of the crankshaft that is away from the side clearance adjustment gear and the housing.

5. An engine according to claim 4, characterized in that: One end of the primary reduction driven gear is connected to the housing through a second bearing, and the other end is connected to the housing through a third bearing.

6. An engine according to claim 5, characterized in that: A second oil seal is connected between the end of the primary reduction driven gear away from the interior of the housing and the housing.

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